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.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00018.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
6948c6bc17d666663a84c124b3176039e64a58f4 affected < 38ce329534500bf4ae71f81df6a37a406cf187b4
b568ed385a18c0ddbe41862b69088b636550a04f affected < 92869945cc5b78ee8a1ef90336fe070893e3458a
762bb3528249604bc680a9df635e8995740176de affected < 0364742decb0f02bc183404868b82896f7992595
bac8520892812dada1ac93f27d96317470d24b1f affected < 094bf5670e762afa243d2c41a5c4ab71c7447bf4
7881ef3f33bb80f459ea6020d1e021fc524a6348 affected < 86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d
7881ef3f33bb80f459ea6020d1e021fc524a6348 affected < a61156314b66456ab6a291ed5deba1ebd002ab3c
7881ef3f33bb80f459ea6020d1e021fc524a6348 affected < e87ef30fe73e7e10d2c85bdcc778dcec24dca553
7881ef3f33bb80f459ea6020d1e021fc524a6348 affected < 1ab19c5de4c537ec0d9b21020395a5b5a6c059b2
1e7a416fb765c9072479dc424780c0937ba99270 affected —
dcbdbe13796ffa561510d2686a6318564e728bbd affected —
Linux Linux affected
Version Status Constraints
5.2 affected —
0 unaffected < 5.2
4.4.274 unaffected ≤ 4.4.*
4.9.274 unaffected ≤ 4.9.*
4.14.238 unaffected ≤ 4.14.*
4.19.196 unaffected ≤ 4.19.*
5.4.127 unaffected ≤ 5.4.*
5.10.45 unaffected ≤ 5.10.*
5.12.12 unaffected ≤ 5.12.*
5.13 unaffected ≤ *

Configuration 1 [-]

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*

No data.

No data.

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/0364742decb0f02bc183404868b82896f7992595 cve-icon cve-icon
https://git.kernel.org/stable/c/094bf5670e762afa243d2c41a5c4ab71c7447bf4 cve-icon cve-icon
https://git.kernel.org/stable/c/1ab19c5de4c537ec0d9b21020395a5b5a6c059b2 cve-icon cve-icon
https://git.kernel.org/stable/c/38ce329534500bf4ae71f81df6a37a406cf187b4 cve-icon cve-icon
https://git.kernel.org/stable/c/86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d cve-icon cve-icon
https://git.kernel.org/stable/c/92869945cc5b78ee8a1ef90336fe070893e3458a cve-icon cve-icon
https://git.kernel.org/stable/c/a61156314b66456ab6a291ed5deba1ebd002ab3c cve-icon cve-icon
https://git.kernel.org/stable/c/e87ef30fe73e7e10d2c85bdcc778dcec24dca553 cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2021-47254 cve-icon
https://www.cve.org/CVERecord?id=CVE-2021-47254 cve-icon
History

Mon, 30 Dec 2024 20:15:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

 cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Mon, 04 Nov 2024 12:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2025-05-21T08:31:40.360Z

Reserved: 2024-04-10T18:59:19.539Z

Link: CVE-2021-47254

cve-icon Vulnrichment

Updated: 2024-08-04T05:32:07.867Z

cve-icon NVD

Status : Analyzed

Published: 2024-05-21T15:15:14.233

Modified: 2026-01-27T19:37:29.877

Link: CVE-2021-47254

cve-icon Redhat

Severity : Moderate

Publid Date: 2024-05-21T00:00:00Z

Links: CVE-2021-47254 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses