CVE-2021-47254

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2024-05-21. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
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:

gfs2: Fix use-after-free in gfs2_glock_shrink_scan

The GLF_LRU flag is checked under lru_lock in gfs2_glock_remove_from_lru() to remove the glock from the lru list in __gfs2_glock_put().

On the shrink scan path, the same flag is cleared under lru_lock but because of cond_resched_lock(&lru_lock) in gfs2_dispose_glock_lru(), progress on the put side can be made without deleting the glock from the lru list.

Keep GLF_LRU across the race window opened by cond_resched_lock(&lru_lock) to ensure correct behavior on both sides - clear GLF_LRU after list_del under lru_lock.

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
14%
KEV
Not listed

Published

May 21, 2024

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Aug 4, 2026
No patch confirmed yet.
generic

gfs2: Fix use-after-free in gfs2_glock_shrink_scan - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/094bf5670e762afa243d2c41a5c4ab71c7447bf4
generic

gfs2: Fix use-after-free in gfs2_glock_shrink_scan - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0364742decb0f02bc183404868b82896f7992595
generic

gfs2: Fix use-after-free in gfs2_glock_shrink_scan - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e87ef30fe73e7e10d2c85bdcc778dcec24dca553
generic

gfs2: Fix use-after-free in gfs2_glock_shrink_scan - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a61156314b66456ab6a291ed5deba1ebd002ab3c
generic

gfs2: Fix use-after-free in gfs2_glock_shrink_scan - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/92869945cc5b78ee8a1ef90336fe070893e3458a
generic

gfs2: Fix use-after-free in gfs2_glock_shrink_scan - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d
generic

gfs2: Fix use-after-free in gfs2_glock_shrink_scan - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/38ce329534500bf4ae71f81df6a37a406cf187b4
generic

gfs2: Fix use-after-free in gfs2_glock_shrink_scan - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1ab19c5de4c537ec0d9b21020395a5b5a6c059b2

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-lts-xenial (4.4.0.279.285) @ xenial2026-05-24ubuntu
ubuntulinux-tools-fips (4.4.0.1123.124) @ xenial2026-05-24ubuntu

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 rangeFixed inDependents
linux—5.10.46-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.46-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.46-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—5.10.46-1—

Weakness Classification(1)

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

All Vendor Advisories

(2)

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 8× in last 7d / 29× 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 170 total refreshes for this CVE.

  1. 2026-09-24 14:00 UTCEPSS rescore
  2. 2026-09-24 14:00 UTCEPSS rescore
  3. 2026-09-23 13:45 UTCEPSS rescore
  4. 2026-09-22 14:44 UTCEPSS rescore
  5. 2026-09-21 20:28 UTCEPSS rescore
  6. 2026-09-20 20:13 UTCEPSS rescore
  7. 2026-09-19 15:38 UTCEPSS rescore
  8. 2026-09-18 19:24 UTCEPSS rescore
  9. 2026-09-17 19:23 UTCEPSS rescore
  10. 2026-09-16 14:05 UTCEPSS rescore
  11. 2026-09-16 14:05 UTCEPSS rescore
  12. 2026-09-15 03:06 UTCEPSS rescore
  13. 2026-09-12 14:57 UTCEPSS rescore
  14. 2026-09-11 14:49 UTCEPSS rescore
  15. 2026-09-11 09:33 UTCEPSS rescore
  16. 2026-09-08 21:57 UTCEPSS rescore
  17. 2026-09-07 15:58 UTCEPSS rescore
  18. 2026-09-07 05:48 UTCOSV refresh
  19. 2026-09-06 13:45 UTCEPSS rescore
  20. 2026-09-05 15:25 UTCEPSS rescore
  21. 2026-09-04 13:57 UTCEPSS rescore
  22. 2026-09-04 05:03 UTCEPSS rescore
  23. 2026-09-02 14:09 UTCEPSS rescore
  24. 2026-09-01 13:51 UTCEPSS rescore
  25. 2026-08-30 19:14 UTCEPSS rescore
Show 75 more
  1. 2026-08-30 01:19 UTCEPSS rescore
  2. 2026-08-28 21:38 UTCEPSS rescore
  3. 2026-08-27 14:22 UTCEPSS rescore
  4. 2026-08-26 14:43 UTCEPSS rescore
  5. 2026-08-25 13:46 UTCEPSS rescore
  6. 2026-08-24 14:13 UTCEPSS rescore
  7. 2026-08-21 23:46 UTCEPSS rescore
  8. 2026-08-20 22:52 UTCEPSS rescore
  9. 2026-08-20 15:31 UTCOSV refresh
  10. 2026-08-19 17:01 UTCEPSS rescore
  11. 2026-08-18 13:45 UTCEPSS rescore
  12. 2026-08-17 13:44 UTCEPSS rescore
  13. 2026-08-16 14:53 UTCEPSS rescore
  14. 2026-08-16 02:11 UTCEPSS rescore
  15. 2026-08-15 01:27 UTCEPSS rescore
  16. 2026-08-13 21:57 UTCEPSS rescore
  17. 2026-08-12 13:48 UTCEPSS rescore
  18. 2026-08-11 13:38 UTCEPSS rescore
  19. 2026-08-09 13:44 UTCEPSS rescore
  20. 2026-08-08 16:34 UTCEPSS rescore
  21. 2026-08-07 16:24 UTCEPSS rescore
  22. 2026-08-05 19:15 UTCEPSS rescore
  23. 2026-08-05 09:41 UTCEG score recompute
  24. 2026-08-05 09:41 UTCGHSA enrichment
  25. 2026-08-04 15:06 UTCEPSS rescore
  26. 2026-08-04 12:12 UTCEG score recompute
  27. 2026-08-04 12:12 UTCVendor advisory
  28. 2026-08-04 12:12 UTCGHSA enrichment
  29. 2026-08-04 10:34 UTCEPSS rescore
  30. 2026-08-04 09:52 UTCEG score recompute
  31. 2026-08-04 09:52 UTCVendor advisory
  32. 2026-08-04 09:52 UTCGHSA enrichment
  33. 2026-08-03 10:33 UTCEPSS rescore
  34. 2026-08-02 02:24 UTCEPSS rescore
  35. 2026-08-01 04:13 UTCEPSS rescore
  36. 2026-08-01 02:12 UTCOSV refresh
  37. 2026-07-30 16:25 UTCEPSS rescore
  38. 2026-07-30 01:28 UTCEPSS rescore
  39. 2026-07-28 15:33 UTCEPSS rescore
  40. 2026-07-26 14:52 UTCEPSS rescore
  41. 2026-07-25 14:15 UTCEPSS rescore
  42. 2026-07-24 14:15 UTCEPSS rescore
  43. 2026-07-24 14:15 UTCEPSS rescore
  44. 2026-07-23 14:16 UTCEPSS rescore
  45. 2026-07-23 02:06 UTCEG score recompute
  46. 2026-07-22 22:53 UTCEG score recompute
  47. 2026-07-22 14:06 UTCEPSS rescore
  48. 2026-07-21 15:22 UTCEPSS rescore
  49. 2026-07-21 15:22 UTCEPSS rescore
  50. 2026-07-20 17:05 UTCEPSS rescore
  51. 2026-07-19 02:27 UTCEPSS rescore
  52. 2026-07-19 02:27 UTCEPSS rescore
  53. 2026-07-18 10:02 UTCEPSS rescore
  54. 2026-07-16 17:00 UTCEPSS rescore
  55. 2026-07-16 17:00 UTCEPSS rescore
  56. 2026-07-15 16:55 UTCEPSS rescore
  57. 2026-07-15 01:58 UTCEPSS rescore
  58. 2026-07-15 01:58 UTCEPSS rescore
  59. 2026-07-14 09:40 UTCOSV refresh
  60. 2026-07-13 22:27 UTCEPSS rescore
  61. 2026-07-13 06:11 UTCEPSS rescore
  62. 2026-07-13 06:11 UTCEPSS rescore
  63. 2026-07-12 05:44 UTCEPSS rescore
  64. 2026-07-11 08:25 UTCEPSS rescore
  65. 2026-07-09 19:07 UTCEPSS rescore
  66. 2026-07-09 19:07 UTCEPSS rescore
  67. 2026-07-08 15:12 UTCEPSS rescore
  68. 2026-07-08 15:12 UTCEPSS rescore
  69. 2026-07-07 13:43 UTCEPSS rescore
  70. 2026-07-06 16:25 UTCEPSS rescore
  71. 2026-07-06 16:25 UTCEPSS rescore
  72. 2026-07-06 02:21 UTCEPSS rescore
  73. 2026-07-06 02:21 UTCEPSS rescore
  74. 2026-07-05 02:28 UTCEPSS rescore
  75. 2026-07-05 02:28 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2021-47254?
CVE-2021-47254 is a high vulnerability published on May 21, 2024. In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix use-after-free in gfs2glockshrink_scan The GLFLRU flag is checked under lrulock in gfs2glockremovefromlru() to remove the glock from the lru list in gfs2glockput(). On the shrink scan path, the same flag is cleared under…
When was CVE-2021-47254 disclosed?
CVE-2021-47254 was first published in the National Vulnerability Database on May 21, 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-2021-47254 actively exploited?
CVE-2021-47254 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 86.5% of all scored CVEs.
What is the CVSS score of CVE-2021-47254?
CVE-2021-47254 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2021-47254?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47254, 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.

Dependency Blast Radius

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