CVE-2021-47254
gfs2: Fix use-after-free in gfs2_glock_shrink_scan
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
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.
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: gfs2: corrige use-after-free en gfs2_glock_shrink_scan. El indicador GLF_LRU se marca en lru_lock en gfs2_glock_remove_from_lru() para eliminar el glock de la lista lru en __gfs2_glock_put(). En la ruta de escaneo de reducción, la misma bandera se borra en lru_lock pero debido a cond_resched_lock(&lru_lock) en gfs2_dispose_glock_lru(), se puede avanzar en el lado de venta sin eliminar la glock de la lista de lru. Mantenga GLF_LRU en la ventana de ejecución abierta por cond_resched_lock(&lru_lock) para garantizar un comportamiento correcto en ambos lados; borre GLF_LRU después de list_del en lru_lock.
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.
The SUSE Linux Enterprise 15 SP3 kernel was updated to receive various security bug fixes.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-04-10 CVE Reserved
- 2024-05-21 CVE Published
- 2025-05-21 CVE Updated
- 2025-06-29 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (15)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/6948c6bc17d666663a84c124b3176039e64a58f4 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/b568ed385a18c0ddbe41862b69088b636550a04f | Vuln. Introduced | |
| https://git.kernel.org/stable/c/762bb3528249604bc680a9df635e8995740176de | Vuln. Introduced | |
| https://git.kernel.org/stable/c/bac8520892812dada1ac93f27d96317470d24b1f | Vuln. Introduced | |
| https://git.kernel.org/stable/c/7881ef3f33bb80f459ea6020d1e021fc524a6348 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/1e7a416fb765c9072479dc424780c0937ba99270 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/dcbdbe13796ffa561510d2686a6318564e728bbd | Vuln. Introduced |
| URL | Date | SRC |
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| URL | Date | SRC |
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Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.4.181 < 4.4.274 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.4.181 < 4.4.274" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.9.180 < 4.9.274 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.9.180 < 4.9.274" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.14.123 < 4.14.238 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.14.123 < 4.14.238" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.19.47 < 4.19.196 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.19.47 < 4.19.196" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.2 < 5.4.127 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.2 < 5.4.127" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.2 < 5.10.45 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.2 < 5.10.45" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.2 < 5.12.12 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.2 < 5.12.12" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.2 < 5.13 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.2 < 5.13" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 5.0.20 Search vendor "Linux" for product "Linux Kernel" and version "5.0.20" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 5.1.6 Search vendor "Linux" for product "Linux Kernel" and version "5.1.6" | en |
Affected
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