CVE-2025-21631

HIGHNVD 7.87.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2025-01-19. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week

Also known asEUVD-2025-2580 (ENISA EUVD) · GHSA-x69f-qgv5-6pgg (GitHub Security Advisories)Source: ENISA EUVD

7.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

block, bfq: fix waker_bfqq UAF after bfq_split_bfqq()

Our syzkaller report a following UAF for v6.6:

BUG: KASAN: slab-use-after-free in bfq_init_rq+0x175d/0x17a0 block/bfq-iosched.c:6958 Read of size 8 at addr ffff8881b57147d8 by task fsstress/232726

CPU: 2 PID: 232726 Comm: fsstress Not tainted 6.6.0-g3629d1885222 #39 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x91/0xf0 lib/dump_stack.c:106 print_address_description.constprop.0+0x66/0x300 mm/kasan/report.c:364 print_report+0x3e/0x70 mm/kasan/report.c:475 kasan_report+0xb8/0xf0 mm/kasan/report.c:588 hlist_add_head include/linux/list.h:1023 [inline] bfq_init_rq+0x175d/0x17a0 block/bfq-iosched.c:6958 bfq_insert_request.isra.0+0xe8/0xa20 block/bfq-iosched.c:6271 bfq_insert_requests+0x27f/0x390 block/bfq-iosched.c:6323 blk_mq_insert_request+0x290/0x8f0 block/blk-mq.c:2660 blk_mq_submit_bio+0x1021/0x15e0 block/blk-mq.c:3143 __submit_bio+0xa0/0x6b0 block/blk-core.c:639 __submit_bio_noacct_mq block/blk-core.c:718 [inline] submit_bio_noacct_nocheck+0x5b7/0x810 block/blk-core.c:747 submit_bio_noacct+0xca0/0x1990 block/blk-core.c:847 __ext4_read_bh fs/ext4/super.c:205 [inline] ext4_read_bh+0x15e/0x2e0 fs/ext4/super.c:230 __read_extent_tree_block+0x304/0x6f0 fs/ext4/extents.c:567 ext4_find_extent+0x479/0xd20 fs/ext4/extents.c:947 ext4_ext_map_blocks+0x1a3/0x2680 fs/ext4/extents.c:4182 ext4_map_blocks+0x929/0x15a0 fs/ext4/inode.c:660 ext4_iomap_begin_report+0x298/0x480 fs/ext4/inode.c:3569 iomap_iter+0x3dd/0x1010 fs/iomap/iter.c:91 iomap_fiemap+0x1f4/0x360 fs/iomap/fiemap.c:80 ext4_fiemap+0x181/0x210 fs/ext4/extents.c:5051 ioctl_fiemap.isra.0+0x1b4/0x290 fs/ioctl.c:220 do_vfs_ioctl+0x31c/0x11a0 fs/ioctl.c:811 __do_sys_ioctl fs/ioctl.c:869 [inline] __se_sys_ioctl+0xae/0x190 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x70/0x120 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x78/0xe2

Allocated by task 232719: kasan_save_stack+0x22/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x87/0x90 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook mm/slab.h:768 [inline] slab_alloc_node mm/slub.c:3492 [inline] kmem_cache_alloc_node+0x1b8/0x6f0 mm/slub.c:3537 bfq_get_queue+0x215/0x1f00 block/bfq-iosched.c:5869 bfq_get_bfqq_handle_split+0x167/0x5f0 block/bfq-iosched.c:6776 bfq_init_rq+0x13a4/0x17a0 block/bfq-iosched.c:6938 bfq_insert_request.isra.0+0xe8/0xa20 block/bfq-iosched.c:6271 bfq_insert_requests+0x27f/0x390 block/bfq-iosched.c:6323 blk_mq_insert_request+0x290/0x8f0 block/blk-mq.c:2660 blk_mq_submit_bio+0x1021/0x15e0 block/blk-mq.c:3143 __submit_bio+0xa0/0x6b0 block/blk-core.c:639 __submit_bio_noacct_mq block/blk-core.c:718 [inline] submit_bio_noacct_nocheck+0x5b7/0x810 block/blk-core.c:747 submit_bio_noacct+0xca0/0x1990 block/blk-core.c:847 __ext4_read_bh fs/ext4/super.c:205 [inline] ext4_read_bh_nowait+0x15a/0x240 fs/ext4/super.c:217 ext4_read_bh_lock+0xac/0xd0 fs/ext4/super.c:242 ext4_bread_batch+0x268/0x500 fs/ext4/inode.c:958 __ext4_find_entry+0x448/0x10f0 fs/ext4/namei.c:1671 ext4_lookup_entry fs/ext4/namei.c:1774 [inline] ext4_lookup.part.0+0x359/0x6f0 fs/ext4/namei.c:1842 ext4_lookup+0x72/0x90 fs/ext4/namei.c:1839 __lookup_slow+0x257/0x480 fs/namei.c:1696 lookup_slow fs/namei.c:1713 [inline] walk_component+0x454/0x5c0 fs/namei.c:2004 link_path_walk.part.0+0x773/0xda0 fs/namei.c:2331 link_path_walk fs/namei.c:3826 [inline] path_openat+0x1b9/0x520 fs/namei.c:3826 do_filp_open+0x1b7/0x400 fs/namei.c:3857 do_sys_openat2+0x5dc/0x6e0 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __x64_sys_openat+0x148/0x200 fs/open.c:1454 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_6 ---truncated---

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity78% × 45%
Impact severity (EG Severity): CVSS 7.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
11th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.8): severity, escalated by confirmed exploitation. This CVE's 7.8 is its impact severity (EG Severity), not escalated.

EG Severity
7.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-27). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

January 19, 2025

Last Modified

August 5, 2026

Advisory Details (5)

Auto-updated Jul 30, 2026
Patch available.
Web page

block, bfq: fix waker_bfqq UAF after bfq_split_bfqq() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fcede1f0a043ccefe9bc6ad57f12718e42f63f1d
Web page

block, bfq: fix waker_bfqq UAF after bfq_split_bfqq() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/bc2aeb35ff167e0c6b0cedf0c96a5c41e6cba1ed
Web page

block, bfq: fix waker_bfqq UAF after bfq_split_bfqq() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/be3eed59ac01f429ac10aaa46e26f653bcf581ab
Web page

block, bfq: fix waker_bfqq UAF after bfq_split_bfqq() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2550149fcdf2934155ff625d76ad4e3d4b25bbc6
Web page

block, bfq: fix waker_bfqq UAF after bfq_split_bfqq() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f587c1ac68956c4703857d650d9b1cd7bb2ac4d7

Vendor Advisories for CVE-2025-21631(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(29)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-xilinx-zynqmp-tools-host (5.15.0-1044.48) @ jammy2026-10-27ubuntu
ubuntulinux-tools-raspi (6.11.0-1010.10) @ oracular2026-10-27ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.136.147~20.04.1) @ focal2026-10-27ubuntu
ubuntulinux-tools-azure-fde-edge (5.15.0.1086.95~20.04.1.61) @ focal2026-10-27ubuntu
ubuntulinux-tools-ibm-edge (5.15.0.1074.77~20.04.1) @ focal2026-10-27ubuntu
ubuntulinux-tools-intel-iotg-edge (5.15.0.1077.83~20.04.1) @ focal2026-10-27ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1081.90~20.04.1) @ focal2026-10-27ubuntu
ubuntulinux-tools-realtime (6.8.1-1022.23) @ noble2026-10-27ubuntu
ubuntulinux-tools-azure-nvidia (6.8.0-1016.17) @ noble2026-10-27ubuntu
ubuntulinux-tools-raspi (6.8.0-1028.32) @ noble2026-10-27ubuntu
ubuntulinux-tools-kvm (5.15.0.1076.72) @ jammy2026-10-27ubuntu
ubuntulinux-tools-gkeop-6.8 (6.8.0-1012.14) @ noble2026-10-27ubuntu
ubuntulinux-tools-raspi-realtime (6.8.0-2023.24) @ noble2026-10-27ubuntu
ubuntulinux-virtual (6.8.0-60.63) @ noble2026-10-27ubuntu
ubuntulinux-tools-gcp-fips (5.15.0.1079.69) @ jammy2026-10-27ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k (6.8.0-1028.31.1) @ noble2026-10-27ubuntu
ubuntulinux-tools-realtime (5.15.0.1080.83) @ jammy2026-10-27ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.135.133) @ jammy2026-10-27ubuntu
ubuntulinux-tools-nvidia-tegra-rt (5.15.0.1033.33) @ jammy2026-10-27ubuntu
ubuntulinux-tools-gke (6.8.0-1025.29) @ noble2026-10-27ubuntu
ubuntulinux-tools-oem-24.04a (6.8.0-1028.28) @ noble2026-10-27ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1026.27~22.04.1) @ jammy2026-10-27ubuntu
ubuntulinux-virtual-hwe-24.04-edge (6.11.0-21.21) @ oracular2026-10-27ubuntu
ubuntulinux-tools-lowlatency-64k (6.11.0-1011.12) @ oracular2026-10-27ubuntu
ubuntulinux-tools-lowlatency-hwe-24.04-edge (6.11.0-1011.12~24.04.1) @ noble2026-10-27ubuntu
ubuntulinux-tools-oem-24.04b (6.11.0-1017.17) @ noble2026-10-27ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-60.63~22.04.1) @ jammy2026-10-27ubuntu
redhatkernel-0:5.14.0-611.5.1.el9_72025-11-11redhat
linuxKernel @ 5.15.177 (fixes >=0)—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
linux-6.16.1.106-3~deb11u1, 6.1.106-3~deb11u2, 6.1.106-3~deb11u3, 6.1.112-1~deb11u1, 6.1.119-1~deb11u1
  • every version up to 6.1.128-1~deb11u1: fixed in 6.1.128-1~deb11u1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (34 versions)
  • every version up to 6.1.128-1: fixed in 6.1.128-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.12.10-1: fixed in 6.12.10-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.12.10-1: fixed in 6.12.10-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(23)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 42× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 96 of 203 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 4 repeat rows among the latest 100 are merged into the row they repeat. The 107 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:32 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  2. 2026-10-31 16:30 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  3. 2026-10-30 16:32 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  4. 2026-10-29 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  5. 2026-10-28 16:30 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  6. 2026-10-27 17:46 UTCEG score recompute
  7. 2026-10-27 17:46 UTCVendor advisory
  8. 2026-10-27 17:46 UTCGHSA enrichmentGHSA-x69f-qgv5-6pgg · GitHub severity HIGH · GitHub CVSS 7.8
  9. 2026-10-27 16:30 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  10. 2026-10-26 16:29 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  11. 2026-10-25 16:43 UTCEG score recompute
  12. 2026-10-25 16:31 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  13. 2026-10-24 16:30 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  14. 2026-10-23 16:30 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  15. 2026-10-22 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  16. 2026-10-21 16:30 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  17. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  18. 2026-10-19 16:30 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  19. 2026-10-19 00:50 UTCEG score recompute
  20. 2026-10-19 00:50 UTCVendor advisory
  21. 2026-10-19 00:49 UTCGHSA enrichmentGHSA-x69f-qgv5-6pgg · GitHub severity HIGH · GitHub CVSS 7.8
  22. 2026-10-18 16:30 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  23. 2026-10-18 05:46 UTCEG score recompute
  24. 2026-10-17 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  25. 2026-10-16 16:38 UTCEPSS rescoreEPSS 0.2% · 10th percentile
Show 71 more
  1. 2026-10-15 16:30 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  2. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  3. 2026-10-13 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  4. 2026-10-12 17:19 UTCEG score recompute
  5. 2026-10-12 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  6. 2026-10-11 20:51 UTCEG score recompute
  7. 2026-10-11 19:01 UTCEG score recompute
  8. 2026-10-11 15:41 UTCEG score recompute
  9. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  10. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  11. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  12. 2026-10-08 17:09 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  13. 2026-10-07 23:46 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  14. 2026-10-06 15:16 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  15. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  16. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  17. 2026-10-03 14:24 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  18. 2026-10-02 16:26 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  19. 2026-10-01 19:48 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  20. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  21. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  22. 2026-09-27 03:45 UTCOSV refresh
  23. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  24. 2026-09-26 00:24 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  25. 2026-09-24 14:02 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  26. 2026-09-23 13:46 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  27. 2026-09-22 14:47 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  28. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  29. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  30. 2026-09-16 14:06 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  31. 2026-09-16 05:13 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  32. 2026-09-15 03:09 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  33. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  34. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  35. 2026-09-11 14:51 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  36. 2026-09-11 09:35 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  37. 2026-09-10 09:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  38. 2026-09-08 21:59 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  39. 2026-09-07 16:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  40. 2026-09-07 13:18 UTCOSV refresh
  41. 2026-09-06 13:46 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  42. 2026-09-05 15:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  43. 2026-09-04 05:05 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  44. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  45. 2026-09-01 13:52 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  46. 2026-08-30 19:16 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  47. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  48. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  49. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  50. 2026-08-25 13:47 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  51. 2026-08-23 00:18 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  52. 2026-08-21 23:48 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  53. 2026-08-20 22:54 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  54. 2026-08-20 22:31 UTCOSV refresh
  55. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  56. 2026-08-18 13:47 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  57. 2026-08-17 13:46 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  58. 2026-08-16 14:55 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  59. 2026-08-16 02:13 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  60. 2026-08-15 01:29 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  61. 2026-08-13 21:59 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  62. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  63. 2026-08-10 23:59 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  64. 2026-08-09 13:45 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  65. 2026-08-07 16:26 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  66. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  67. 2026-08-05 19:16 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  68. 2026-08-05 14:06 UTCEG score recompute
  69. 2026-08-05 14:06 UTCVendor advisory
  70. 2026-08-05 14:06 UTCGHSA enrichmentGHSA-x69f-qgv5-6pgg · GitHub severity HIGH · GitHub CVSS 7.8
  71. 2026-08-04 15:09 UTCEPSS rescoreEPSS 0.2% · 10th percentile

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Frequently asked(5)

What is CVE-2025-21631?
CVE-2025-21631 is a high-severity vulnerability; its CVE record was published on January 19, 2025. In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix waker_bfqq UAF after bfq_split_bfqq() Our syzkaller report a following UAF for v6.6: BUG: KASAN: slab-use-after-free in bfq_init_rq+0x175d/0x17a0 block/bfq-iosched.c:6958 Read of size 8 at addr ffff8881b57147d8 by…
When was the CVE record for CVE-2025-21631 published?
The CVE record for CVE-2025-21631 was published on January 19, 2025. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of August 5, 2026; the record at its source may have been updated since.
Is CVE-2025-21631 actively exploited?
CVE-2025-21631 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (11th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2025-21631?
CVE-2025-21631 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2025-21631?
A fix for CVE-2025-21631 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2025-21631 are linked in the Vendor Advisories panel on this page.

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