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.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-04-10 CVE Reserved
- 2024-05-21 CVE Published
- 2024-05-22 EPSS Updated
- 2024-08-04 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (8)
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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" | < 4.4.274 Search vendor "Linux" for product "Linux Kernel" and version " < 4.4.274" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 4.9.274 Search vendor "Linux" for product "Linux Kernel" and version " < 4.9.274" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 4.14.238 Search vendor "Linux" for product "Linux Kernel" and version " < 4.14.238" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 4.19.196 Search vendor "Linux" for product "Linux Kernel" and version " < 4.19.196" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 5.4.127 Search vendor "Linux" for product "Linux Kernel" and version " < 5.4.127" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 5.10.45 Search vendor "Linux" for product "Linux Kernel" and version " < 5.10.45" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 5.12.12 Search vendor "Linux" for product "Linux Kernel" and version " < 5.12.12" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 5.13 Search vendor "Linux" for product "Linux Kernel" and version " < 5.13" | en |
Affected
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