CVE-2024-39463

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2024-06-25. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

9p: add missing locking around taking dentry fid list

Fix a use-after-free on dentry's d_fsdata fid list when a thread looks up a fid through dentry while another thread unlinks it:

UAF thread: refcount_t: addition on 0; use-after-free. p9_fid_get linux/./include/net/9p/client.h:262 v9fs_fid_find+0x236/0x280 linux/fs/9p/fid.c:129 v9fs_fid_lookup_with_uid linux/fs/9p/fid.c:181 v9fs_fid_lookup+0xbf/0xc20 linux/fs/9p/fid.c:314 v9fs_vfs_getattr_dotl+0xf9/0x360 linux/fs/9p/vfs_inode_dotl.c:400 vfs_statx+0xdd/0x4d0 linux/fs/stat.c:248

Freed by: p9_fid_destroy (inlined) p9_client_clunk+0xb0/0xe0 linux/net/9p/client.c:1456 p9_fid_put linux/./include/net/9p/client.h:278 v9fs_dentry_release+0xb5/0x140 linux/fs/9p/vfs_dentry.c:55 v9fs_remove+0x38f/0x620 linux/fs/9p/vfs_inode.c:518 vfs_unlink+0x29a/0x810 linux/fs/namei.c:4335

The problem is that d_fsdata was not accessed under d_lock, because d_release() normally is only called once the dentry is otherwise no longer accessible but since we also call it explicitly in v9fs_remove that lock is required: move the hlist out of the dentry under lock then unref its fids once they are no longer accessible.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
17%
KEV
Not listed

Published

June 25, 2024

Last Modified

August 5, 2026

Advisory Details (6)

Auto-updated Aug 5, 2026
No patch confirmed yet.
generic

ZDI-24-1194 - TrendAI™ Zero Day Initiative™ (ZDI)

https://www.zerodayinitiative.com/advisories/ZDI-24-1194/
generic

9p: add missing locking around taking dentry fid list - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c898afdc15645efb555acb6d85b484eb40a45409
generic

9p: add missing locking around taking dentry fid list - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fe17ebf22feb4ad7094d597526d558a49aac92b4
generic

9p: add missing locking around taking dentry fid list - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5
generic

9p: add missing locking around taking dentry fid list - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cb299cdba09f46f090b843d78ba26b667d50a456
generic

9p: add missing locking around taking dentry fid list - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3bb6763a8319170c2d41c4232c8e7e4c37dcacfb

Patch Availability(15)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-24.04-edge (6.8.0-44.44) @ noble2026-05-23ubuntu
ubuntulinux-tools-azure (6.8.0-1014.16) @ noble2026-05-23ubuntu
ubuntulinux-tools-raspi (6.8.0-1011.12) @ noble2026-05-23ubuntu
ubuntulinux-tools-lowlatency-hwe-22.04-edge (6.8.0-44.44.1~22.04.1) @ jammy2026-05-23ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-45.45~22.04.1) @ jammy2026-05-23ubuntu
ubuntulinux-tools-nvidia-hwe-22.04-edge (6.8.0-1013.14~22.04.1) @ jammy2026-05-23ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k (6.8.0-1013.14.1) @ noble2026-05-23ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.127.126) @ jammy2026-05-23ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.127.137~20.04.1) @ focal2026-05-23ubuntu
ubuntulinux-tools-aws-lts-22.04 (5.15.0.1073.73) @ jammy2026-05-23ubuntu
ubuntulinux-tools-azure-edge (5.15.0.1078.87~20.04.1) @ focal2026-05-23ubuntu
ubuntulinux-xilinx-zynqmp-tools-host (5.15.0-1039.43) @ jammy2026-05-23ubuntu
ubuntulinux-tools-intel-iotg (5.15.0.1071.71) @ jammy2026-05-23ubuntu
ubuntulinux-tools-azure-lts-22.04 (5.15.0.1078.76) @ jammy2026-05-23ubuntu
linuxKernel @ 5.15.168—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.

Weakness Classification(1)

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

All Vendor Advisories

(15)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 14× in last 7d / 50× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 129 total refreshes for this CVE.

  1. 2026-08-07 16:25 UTCEPSS rescore
  2. 2026-08-06 13:45 UTCEPSS rescore
  3. 2026-08-05 19:16 UTCEPSS rescore
  4. 2026-08-05 12:10 UTCEG score recompute
  5. 2026-08-05 12:10 UTCVendor advisory
  6. 2026-08-05 12:10 UTCGHSA enrichment
  7. 2026-08-04 15:08 UTCEPSS rescore
  8. 2026-08-04 12:03 UTCEG score recompute
  9. 2026-08-04 12:03 UTCVendor advisory
  10. 2026-08-04 12:03 UTCGHSA enrichment
  11. 2026-08-04 10:36 UTCEPSS rescore
  12. 2026-08-03 10:34 UTCEPSS rescore
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  14. 2026-08-02 02:25 UTCEPSS rescore
  15. 2026-08-01 04:14 UTCEPSS rescore
  16. 2026-08-01 04:14 UTCEPSS rescore
  17. 2026-07-31 20:12 UTCOSV refresh
  18. 2026-07-30 16:26 UTCEPSS rescore
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  20. 2026-07-30 01:29 UTCEPSS rescore
  21. 2026-07-28 15:34 UTCEPSS rescore
  22. 2026-07-27 14:11 UTCEPSS rescore
  23. 2026-07-26 14:53 UTCEPSS rescore
  24. 2026-07-25 14:16 UTCEPSS rescore
  25. 2026-07-24 14:16 UTCEPSS rescore
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  1. 2026-07-23 14:17 UTCEPSS rescore
  2. 2026-07-23 14:17 UTCEPSS rescore
  3. 2026-07-23 02:38 UTCEG score recompute
  4. 2026-07-22 14:07 UTCEPSS rescore
  5. 2026-07-22 14:07 UTCEPSS rescore
  6. 2026-07-21 15:23 UTCEPSS rescore
  7. 2026-07-21 15:23 UTCEPSS rescore
  8. 2026-07-20 17:06 UTCEPSS rescore
  9. 2026-07-19 14:30 UTCEPSS rescore
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  11. 2026-07-19 02:28 UTCEPSS rescore
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  13. 2026-07-18 10:03 UTCEPSS rescore
  14. 2026-07-16 17:02 UTCEPSS rescore
  15. 2026-07-15 16:56 UTCEPSS rescore
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  17. 2026-07-15 01:59 UTCEPSS rescore
  18. 2026-07-15 01:59 UTCEPSS rescore
  19. 2026-07-14 03:25 UTCOSV refresh
  20. 2026-07-13 22:29 UTCEPSS rescore
  21. 2026-07-13 06:11 UTCEPSS rescore
  22. 2026-07-12 05:45 UTCEPSS rescore
  23. 2026-07-11 08:26 UTCEPSS rescore
  24. 2026-07-11 08:26 UTCEPSS rescore
  25. 2026-07-09 19:09 UTCEPSS rescore
  26. 2026-07-08 15:14 UTCEPSS rescore
  27. 2026-07-08 15:13 UTCEPSS rescore
  28. 2026-07-07 13:45 UTCEPSS rescore
  29. 2026-07-06 16:26 UTCEPSS rescore
  30. 2026-07-06 02:22 UTCEPSS rescore
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  32. 2026-07-05 02:29 UTCEPSS rescore
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  34. 2026-07-01 15:05 UTCEPSS rescore
  35. 2026-06-30 23:21 UTCEPSS rescore
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  37. 2026-06-29 14:05 UTCEPSS rescore
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  40. 2026-06-28 04:55 UTCEPSS rescore
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  42. 2026-06-27 03:07 UTCEPSS rescore
  43. 2026-06-27 03:07 UTCEPSS rescore
  44. 2026-06-26 01:16 UTCOSV refresh
  45. 2026-06-25 13:49 UTCEPSS rescore
  46. 2026-06-24 14:04 UTCEPSS rescore
  47. 2026-06-24 14:04 UTCEPSS rescore
  48. 2026-06-23 21:32 UTCEPSS rescore
  49. 2026-06-23 21:32 UTCEPSS rescore
  50. 2026-06-22 14:25 UTCEPSS rescore
  51. 2026-06-22 14:25 UTCEPSS rescore
  52. 2026-06-21 14:55 UTCEPSS rescore
  53. 2026-06-21 14:55 UTCEPSS rescore
  54. 2026-06-21 01:58 UTCEPSS rescore
  55. 2026-06-21 01:58 UTCEPSS rescore
  56. 2026-06-19 19:25 UTCEPSS rescore
  57. 2026-06-19 19:25 UTCEPSS rescore
  58. 2026-06-18 17:52 UTCEPSS rescore
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  60. 2026-06-17 17:52 UTCEPSS rescore
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  63. 2026-06-15 17:47 UTCEPSS rescore
  64. 2026-06-14 23:16 UTCEPSS rescore
  65. 2026-06-13 22:59 UTCEPSS rescore
  66. 2026-06-13 22:59 UTCEPSS rescore
  67. 2026-06-12 23:11 UTCEPSS rescore
  68. 2026-06-11 13:59 UTCEPSS rescore
  69. 2026-06-10 22:17 UTCEPSS rescore
  70. 2026-06-10 13:21 UTCEPSS rescore
  71. 2026-06-08 14:16 UTCEPSS rescore
  72. 2026-06-08 14:13 UTCOSV refresh
  73. 2026-06-07 15:24 UTCEPSS rescore
  74. 2026-06-07 15:24 UTCEPSS rescore
  75. 2026-06-06 13:46 UTCEPSS rescore

Frequently asked(5)

What is CVE-2024-39463?
CVE-2024-39463 is a high vulnerability published on June 25, 2024. In the Linux kernel, the following vulnerability has been resolved: 9p: add missing locking around taking dentry fid list Fix a use-after-free on dentry's d_fsdata fid list when a thread looks up a fid through dentry while another thread unlinks it: UAF thread: refcount_t: addition on 0;…
When was CVE-2024-39463 disclosed?
CVE-2024-39463 was first published in the National Vulnerability Database on June 25, 2024, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-39463 actively exploited?
CVE-2024-39463 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 83.3% of all scored CVEs.
What is the CVSS score of CVE-2024-39463?
CVE-2024-39463 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2024-39463?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-39463, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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