CVE-2021-47106

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 2024-03-04. 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 — 3 sources updated this week

Also known asEUVD-2021-33754 (ENISA EUVD) · GHSA-gmwj-428v-53wv (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:

netfilter: nf_tables: fix use-after-free in nft_set_catchall_destroy()

We need to use list_for_each_entry_safe() iterator because we can not access @catchall after kfree_rcu() call.

syzbot reported:

BUG: KASAN: use-after-free in nft_set_catchall_destroy net/netfilter/nf_tables_api.c:4486 [inline] BUG: KASAN: use-after-free in nft_set_destroy net/netfilter/nf_tables_api.c:4504 [inline] BUG: KASAN: use-after-free in nft_set_destroy+0x3fd/0x4f0 net/netfilter/nf_tables_api.c:4493 Read of size 8 at addr ffff8880716e5b80 by task syz-executor.3/8871

CPU: 1 PID: 8871 Comm: syz-executor.3 Not tainted 5.16.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x2ed mm/kasan/report.c:247 __kasan_report mm/kasan/report.c:433 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:450 nft_set_catchall_destroy net/netfilter/nf_tables_api.c:4486 [inline] nft_set_destroy net/netfilter/nf_tables_api.c:4504 [inline] nft_set_destroy+0x3fd/0x4f0 net/netfilter/nf_tables_api.c:4493 __nft_release_table+0x79f/0xcd0 net/netfilter/nf_tables_api.c:9626 nft_rcv_nl_event+0x4f8/0x670 net/netfilter/nf_tables_api.c:9688 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 blocking_notifier_call_chain kernel/notifier.c:318 [inline] blocking_notifier_call_chain+0x67/0x90 kernel/notifier.c:306 netlink_release+0xcb6/0x1dd0 net/netlink/af_netlink.c:788 __sock_release+0xcd/0x280 net/socket.c:649 sock_close+0x18/0x20 net/socket.c:1314 __fput+0x286/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f75fbf28adb Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffd8da7ec10 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f75fbf28adb RDX: 00007f75fc08e828 RSI: ffffffffffffffff RDI: 0000000000000003 RBP: 00007f75fc08a960 R08: 0000000000000000 R09: 00007f75fc08e830 R10: 00007ffd8da7ed10 R11: 0000000000000293 R12: 00000000002067c3 R13: 00007ffd8da7ed10 R14: 00007f75fc088f60 R15: 0000000000000032

Allocated by task 8886: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa6/0xd0 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:269 [inline] kmem_cache_alloc_trace+0x1ea/0x4a0 mm/slab.c:3575 kmalloc include/linux/slab.h:590 [inline] nft_setelem_catchall_insert net/netfilter/nf_tables_api.c:5544 [inline] nft_setelem_insert net/netfilter/nf_tables_api.c:5562 [inline] nft_add_set_elem+0x232e/0x2f40 net/netfilter/nf_tables_api.c:5936 nf_tables_newsetelem+0x6ff/0xbb0 net/netfilter/nf_tables_api.c:6032 nfnetlink_rcv_batch+0x1710/0x25f0 net/netfilter/nfnetlink.c:513 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:634 [inline] nfnetlink_rcv+0x3af/0x420 net/netfilter/nfnetlink.c:652 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x904/0xdf0 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/ ---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 every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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
12th
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 2026-10-28). 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 every mission impact level.CISA BOD 26-04: 60 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 every mission impact level.

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 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 partial (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

March 4, 2024

Last Modified

August 5, 2026

Advisory Details (2)

Auto-updated Aug 4, 2026
Patch available.
Web page

netfilter: nf_tables: fix use-after-free in nft_set_catchall_destroy() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9d558e5f0d6fdd0a568f73dceb0b40c4f5012e5a
Web page

netfilter: nf_tables: fix use-after-free in nft_set_catchall_destroy() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0f7d9b31ce7abdbb29bf018131ac920c9f698518

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.15.15-1: fixed in 5.15.15-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.15.15-1: fixed in 5.15.15-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 5.15.15-1: fixed in 5.15.15-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 38× 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 97 of 214 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. 3 repeat rows among the latest 100 are merged into the row they repeat. The 117 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:30 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  2. 2026-10-31 16:29 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  3. 2026-10-30 16:30 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  4. 2026-10-29 16:29 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  5. 2026-10-28 22:16 UTCEG score recompute
  6. 2026-10-28 22:16 UTCGHSA enrichmentGHSA-gmwj-428v-53wv · GitHub severity HIGH · GitHub CVSS 7.8
  7. 2026-10-28 16:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  8. 2026-10-27 16:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  9. 2026-10-26 16:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  10. 2026-10-25 18:18 UTCEG score recompute
  11. 2026-10-25 16:29 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  12. 2026-10-24 16:29 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  13. 2026-10-23 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  14. 2026-10-22 16:29 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  15. 2026-10-21 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  16. 2026-10-21 08:34 UTCEG score recompute
  17. 2026-10-21 08:34 UTCGHSA enrichmentGHSA-gmwj-428v-53wv · GitHub severity HIGH · GitHub CVSS 7.8
  18. 2026-10-20 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  19. 2026-10-19 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  20. 2026-10-19 13:25 UTCOSV refresh
  21. 2026-10-18 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  22. 2026-10-18 08:49 UTCEG score recompute
  23. 2026-10-17 16:29 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  24. 2026-10-16 16:34 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  25. 2026-10-15 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
Show 72 more
  1. 2026-10-14 16:29 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  2. 2026-10-13 16:28 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  3. 2026-10-12 19:05 UTCEG score recompute
  4. 2026-10-12 16:30 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  5. 2026-10-11 23:31 UTCEG score recompute
  6. 2026-10-11 13:44 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  7. 2026-10-10 19:56 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  8. 2026-10-09 20:04 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  9. 2026-10-08 16:40 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  10. 2026-10-07 23:45 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  11. 2026-10-06 15:14 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  12. 2026-10-05 17:40 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  13. 2026-10-04 23:19 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  14. 2026-10-03 14:22 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  15. 2026-10-02 16:23 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  16. 2026-09-30 15:45 UTCEG score recompute
  17. 2026-09-30 15:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  18. 2026-09-29 15:15 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  19. 2026-09-28 13:47 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  20. 2026-09-26 20:03 UTCOSV refresh
  21. 2026-09-26 15:54 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  22. 2026-09-26 00:21 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  23. 2026-09-24 14:00 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  24. 2026-09-23 13:45 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  25. 2026-09-22 14:44 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  26. 2026-09-21 20:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  27. 2026-09-20 20:13 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  28. 2026-09-19 15:38 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  29. 2026-09-18 19:24 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  30. 2026-09-17 19:23 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  31. 2026-09-16 14:05 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  32. 2026-09-15 03:06 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  33. 2026-09-12 14:57 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  34. 2026-09-11 14:49 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  35. 2026-09-11 09:33 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  36. 2026-09-08 21:57 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  37. 2026-09-07 15:58 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  38. 2026-09-07 05:48 UTCOSV refresh
  39. 2026-09-06 13:45 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  40. 2026-09-05 15:25 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  41. 2026-09-04 13:57 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  42. 2026-09-04 05:03 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  43. 2026-09-02 14:09 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  44. 2026-09-01 13:51 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  45. 2026-08-30 19:14 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  46. 2026-08-30 01:19 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  47. 2026-08-28 21:38 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  48. 2026-08-27 14:22 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  49. 2026-08-26 14:43 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  50. 2026-08-25 13:46 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  51. 2026-08-24 14:13 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  52. 2026-08-21 23:46 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  53. 2026-08-20 22:52 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  54. 2026-08-20 15:31 UTCOSV refresh
  55. 2026-08-19 17:01 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  56. 2026-08-18 13:45 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  57. 2026-08-17 13:44 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  58. 2026-08-16 14:53 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  59. 2026-08-16 02:11 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  60. 2026-08-15 01:27 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  61. 2026-08-13 21:57 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  62. 2026-08-12 13:48 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  63. 2026-08-11 13:38 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  64. 2026-08-09 13:44 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  65. 2026-08-08 16:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  66. 2026-08-07 16:24 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  67. 2026-08-06 13:44 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  68. 2026-08-05 19:15 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  69. 2026-08-05 09:43 UTCEG score recompute
  70. 2026-08-05 09:43 UTCGHSA enrichmentGHSA-gmwj-428v-53wv · GitHub severity HIGH · GitHub CVSS 7.8
  71. 2026-08-04 15:06 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  72. 2026-08-04 12:21 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-47106?
CVE-2021-47106 is a high-severity vulnerability; its CVE record was published on March 4, 2024. In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix use-after-free in nft_set_catchall_destroy() We need to use list_for_each_entry_safe() iterator because we can not access @catchall after kfree_rcu() call. syzbot reported: BUG: KASAN: use-after-free in…
When was the CVE record for CVE-2021-47106 published?
The CVE record for CVE-2021-47106 was published on March 4, 2024. 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-2021-47106 actively exploited?
CVE-2021-47106 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (12th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2021-47106?
CVE-2021-47106 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2021-47106?
A fix for CVE-2021-47106 is available: update to the fixed version the vendor names in its advisory.

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