CVE-2023-53427

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 2025-09-18. 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-2025-29855 (ENISA EUVD) · GHSA-v584-qp6m-f4mf (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:

cifs: Fix warning and UAF when destroy the MR list

If the MR allocate failed, the MR recovery work not initialized and list not cleared. Then will be warning and UAF when release the MR:

WARNING: CPU: 4 PID: 824 at kernel/workqueue.c:3066 __flush_work.isra.0+0xf7/0x110 CPU: 4 PID: 824 Comm: mount.cifs Not tainted 6.1.0-rc5+ #82 RIP: 0010:__flush_work.isra.0+0xf7/0x110 Call Trace: __cancel_work_timer+0x2ba/0x2e0 smbd_destroy+0x4e1/0x990 _smbd_get_connection+0x1cbd/0x2110 smbd_get_connection+0x21/0x40 cifs_get_tcp_session+0x8ef/0xda0 mount_get_conns+0x60/0x750 cifs_mount+0x103/0xd00 cifs_smb3_do_mount+0x1dd/0xcb0 smb3_get_tree+0x1d5/0x300 vfs_get_tree+0x41/0xf0 path_mount+0x9b3/0xdd0 __x64_sys_mount+0x190/0x1d0 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0

BUG: KASAN: use-after-free in smbd_destroy+0x4fc/0x990 Read of size 8 at addr ffff88810b156a08 by task mount.cifs/824 CPU: 4 PID: 824 Comm: mount.cifs Tainted: G W 6.1.0-rc5+ #82 Call Trace: dump_stack_lvl+0x34/0x44 print_report+0x171/0x472 kasan_report+0xad/0x130 smbd_destroy+0x4fc/0x990 _smbd_get_connection+0x1cbd/0x2110 smbd_get_connection+0x21/0x40 cifs_get_tcp_session+0x8ef/0xda0 mount_get_conns+0x60/0x750 cifs_mount+0x103/0xd00 cifs_smb3_do_mount+0x1dd/0xcb0 smb3_get_tree+0x1d5/0x300 vfs_get_tree+0x41/0xf0 path_mount+0x9b3/0xdd0 __x64_sys_mount+0x190/0x1d0 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0

Allocated by task 824: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_kmalloc+0x7a/0x90 _smbd_get_connection+0x1b6f/0x2110 smbd_get_connection+0x21/0x40 cifs_get_tcp_session+0x8ef/0xda0 mount_get_conns+0x60/0x750 cifs_mount+0x103/0xd00 cifs_smb3_do_mount+0x1dd/0xcb0 smb3_get_tree+0x1d5/0x300 vfs_get_tree+0x41/0xf0 path_mount+0x9b3/0xdd0 __x64_sys_mount+0x190/0x1d0 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0

Freed by task 824: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 kasan_save_free_info+0x2a/0x40 ____kasan_slab_free+0x143/0x1b0 __kmem_cache_free+0xc8/0x330 _smbd_get_connection+0x1c6a/0x2110 smbd_get_connection+0x21/0x40 cifs_get_tcp_session+0x8ef/0xda0 mount_get_conns+0x60/0x750 cifs_mount+0x103/0xd00 cifs_smb3_do_mount+0x1dd/0xcb0 smb3_get_tree+0x1d5/0x300 vfs_get_tree+0x41/0xf0 path_mount+0x9b3/0xdd0 __x64_sys_mount+0x190/0x1d0 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0

Let's initialize the MR recovery work before MR allocate to prevent the warning, remove the MRs from the list to prevent the UAF.

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.
Exploitation0.1% × 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
4th
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

September 18, 2025

Last Modified

January 14, 2026

Advisory Details (7)

Auto-updated Oct 20, 2026
Patch available.
Web page

cifs: Fix warning and UAF when destroy the MR list - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cfd85a0922c4696d768965e686ad805a58d9d834
Web page

cifs: Fix warning and UAF when destroy the MR list - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7cbd5bdb5bd4404a5da4309521134b42c65846c0
Web page

cifs: Fix warning and UAF when destroy the MR list - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/41832c62a75dad530dc5a2856c92ae5459d497e5
Web page

cifs: Fix warning and UAF when destroy the MR list - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3e161c2791f8e661eed24a2c624087084d910215
Web page

cifs: Fix warning and UAF when destroy the MR list - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3524d6da0fe88aee79f06be6572955d16ad76b39
Web page

cifs: Fix warning and UAF when destroy the MR list - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2d0c4f5f618f58eba03385363717703bee873c64
Web page

cifs: Fix warning and UAF when destroy the MR list - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/275a3d2b9408fc4895e342f772cab9a89960546e

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
linuxKernel @ 4.19.276 (fixes >=4.16.0)—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
linux5.10.103-1 ... 5.10.92-2 (25 versions)
  • every version up to 5.10.178-1: fixed in 5.10.178-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.1.20-1: fixed in 6.1.20-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.1.20-1: fixed in 6.1.20-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.1.20-1: fixed in 6.1.20-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 37× 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 92 of 191 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. 8 repeat rows among the latest 100 are merged into the row they repeat. The 99 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 16:40 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  2. 2026-11-01 16:31 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  3. 2026-10-31 16:30 UTCEPSS rescoreEPSS 0.2% · 4th percentile
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  6. 2026-10-28 16:29 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  7. 2026-10-27 20:24 UTCEG score recompute
  8. 2026-10-27 20:24 UTCGHSA enrichmentGHSA-v584-qp6m-f4mf · GitHub severity HIGH · GitHub CVSS 7.8
  9. 2026-10-27 16:29 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  10. 2026-10-26 16:29 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  11. 2026-10-25 17:28 UTCEG score recompute
  12. 2026-10-25 16:30 UTCEPSS rescoreEPSS 0.2% · 4th percentile
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  14. 2026-10-23 16:29 UTCEPSS rescoreEPSS 0.2% · 4th percentile
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  16. 2026-10-21 16:29 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  17. 2026-10-20 21:15 UTCEG score recompute
  18. 2026-10-20 21:15 UTCGHSA enrichmentGHSA-v584-qp6m-f4mf · GitHub severity HIGH · GitHub CVSS 7.8
  19. 2026-10-20 16:30 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
  20. 2026-10-19 16:29 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
  21. 2026-10-18 16:29 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
  22. 2026-10-18 07:40 UTCEG score recompute
  23. 2026-10-17 16:30 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
  24. 2026-10-16 16:36 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
  25. 2026-10-15 16:29 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
Show 67 more
  1. 2026-10-14 16:30 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
  2. 2026-10-13 16:30 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
  3. 2026-10-12 18:12 UTCEG score recompute
  4. 2026-10-11 21:37 UTCEG score recompute
  5. 2026-10-11 13:45 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
  6. 2026-10-10 19:58 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
  7. 2026-10-09 20:05 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
  8. 2026-10-08 17:06 UTCEPSS rescoreEPSS 0.2% · 3rd percentile
  9. 2026-10-07 23:46 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  10. 2026-10-06 15:15 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  11. 2026-10-05 17:41 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
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  13. 2026-10-03 14:23 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  14. 2026-10-02 04:41 UTCOSV refresh
  15. 2026-10-01 19:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-09-30 16:37 UTCEG score recompute
  17. 2026-09-30 15:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  18. 2026-09-29 15:17 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  19. 2026-09-28 13:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  20. 2026-09-26 00:22 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
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  22. 2026-09-23 13:46 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  23. 2026-09-20 20:14 UTCEPSS rescoreEPSS 0.1% · 4th percentile
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  27. 2026-09-15 03:08 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  28. 2026-09-13 16:45 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  29. 2026-09-13 00:36 UTCOSV refresh
  30. 2026-09-11 09:34 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  31. 2026-09-08 21:58 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  32. 2026-09-07 15:59 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  33. 2026-09-06 13:46 UTCEPSS rescoreEPSS 0.1% · 4th percentile
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  36. 2026-09-04 05:04 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  37. 2026-09-02 14:10 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  38. 2026-09-01 13:52 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  39. 2026-09-01 04:36 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  40. 2026-08-30 19:15 UTCEPSS rescoreEPSS 0.1% · 4th percentile
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  42. 2026-08-28 21:39 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  43. 2026-08-27 14:23 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  44. 2026-08-26 14:44 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  45. 2026-08-25 13:47 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  46. 2026-08-25 03:56 UTCOSV refresh
  47. 2026-08-23 00:17 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  48. 2026-08-21 23:47 UTCEPSS rescoreEPSS 0.1% · 4th percentile
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  51. 2026-08-18 13:46 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  52. 2026-08-16 14:54 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
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  55. 2026-08-13 21:58 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  56. 2026-08-12 13:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
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  58. 2026-08-10 23:58 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  59. 2026-08-09 13:44 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  60. 2026-08-08 20:55 UTCOSV refresh
  61. 2026-08-08 16:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  62. 2026-08-06 13:45 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  63. 2026-08-05 19:15 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  64. 2026-08-04 10:36 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
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  66. 2026-08-02 02:25 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  67. 2026-08-01 04:14 UTCEPSS rescoreEPSS 0.1% · 3rd percentile

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Frequently asked(5)

What is CVE-2023-53427?
CVE-2023-53427 is a high-severity vulnerability; its CVE record was published on September 18, 2025. In the Linux kernel, the following vulnerability has been resolved: cifs: Fix warning and UAF when destroy the MR list If the MR allocate failed, the MR recovery work not initialized and list not cleared. Then will be warning and UAF when release the MR: WARNING: CPU: 4 PID: 824 at…
When was the CVE record for CVE-2023-53427 published?
The CVE record for CVE-2023-53427 was published on September 18, 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 January 14, 2026; the record at its source may have been updated since.
Is CVE-2023-53427 actively exploited?
CVE-2023-53427 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (4th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2023-53427?
CVE-2023-53427 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2023-53427?
A fix for CVE-2023-53427 is available: update to the fixed version the vendor names in its advisory.

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