CVE-2021-47254

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47254
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.

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/0364742decb0f02bc183404868b82896f7992595 Patch
https://git.kernel.org/stable/c/094bf5670e762afa243d2c41a5c4ab71c7447bf4 Patch
https://git.kernel.org/stable/c/1ab19c5de4c537ec0d9b21020395a5b5a6c059b2 Patch
https://git.kernel.org/stable/c/38ce329534500bf4ae71f81df6a37a406cf187b4 Patch
https://git.kernel.org/stable/c/86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d Patch
https://git.kernel.org/stable/c/92869945cc5b78ee8a1ef90336fe070893e3458a Patch
https://git.kernel.org/stable/c/a61156314b66456ab6a291ed5deba1ebd002ab3c Patch
https://git.kernel.org/stable/c/e87ef30fe73e7e10d2c85bdcc778dcec24dca553 Patch
https://git.kernel.org/stable/c/0364742decb0f02bc183404868b82896f7992595 Patch
https://git.kernel.org/stable/c/094bf5670e762afa243d2c41a5c4ab71c7447bf4 Patch
https://git.kernel.org/stable/c/1ab19c5de4c537ec0d9b21020395a5b5a6c059b2 Patch
https://git.kernel.org/stable/c/38ce329534500bf4ae71f81df6a37a406cf187b4 Patch
https://git.kernel.org/stable/c/86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d Patch
https://git.kernel.org/stable/c/92869945cc5b78ee8a1ef90336fe070893e3458a Patch
https://git.kernel.org/stable/c/a61156314b66456ab6a291ed5deba1ebd002ab3c Patch
https://git.kernel.org/stable/c/e87ef30fe73e7e10d2c85bdcc778dcec24dca553 Patch
Configurations

Configuration 1 (hide)

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: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:*:*:*:*:*:*
History

30 Dec 2024, 19:50

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8
CPE cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CWE CWE-416
References () https://git.kernel.org/stable/c/0364742decb0f02bc183404868b82896f7992595 - () https://git.kernel.org/stable/c/0364742decb0f02bc183404868b82896f7992595 - Patch
References () https://git.kernel.org/stable/c/094bf5670e762afa243d2c41a5c4ab71c7447bf4 - () https://git.kernel.org/stable/c/094bf5670e762afa243d2c41a5c4ab71c7447bf4 - Patch
References () https://git.kernel.org/stable/c/1ab19c5de4c537ec0d9b21020395a5b5a6c059b2 - () https://git.kernel.org/stable/c/1ab19c5de4c537ec0d9b21020395a5b5a6c059b2 - Patch
References () https://git.kernel.org/stable/c/38ce329534500bf4ae71f81df6a37a406cf187b4 - () https://git.kernel.org/stable/c/38ce329534500bf4ae71f81df6a37a406cf187b4 - Patch
References () https://git.kernel.org/stable/c/86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d - () https://git.kernel.org/stable/c/86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d - Patch
References () https://git.kernel.org/stable/c/92869945cc5b78ee8a1ef90336fe070893e3458a - () https://git.kernel.org/stable/c/92869945cc5b78ee8a1ef90336fe070893e3458a - Patch
References () https://git.kernel.org/stable/c/a61156314b66456ab6a291ed5deba1ebd002ab3c - () https://git.kernel.org/stable/c/a61156314b66456ab6a291ed5deba1ebd002ab3c - Patch
References () https://git.kernel.org/stable/c/e87ef30fe73e7e10d2c85bdcc778dcec24dca553 - () https://git.kernel.org/stable/c/e87ef30fe73e7e10d2c85bdcc778dcec24dca553 - Patch
First Time Linux linux Kernel
Linux

21 Nov 2024, 06:35

Type Values Removed Values Added
Summary
  • (es) 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.
References () https://git.kernel.org/stable/c/0364742decb0f02bc183404868b82896f7992595 - () https://git.kernel.org/stable/c/0364742decb0f02bc183404868b82896f7992595 -
References () https://git.kernel.org/stable/c/094bf5670e762afa243d2c41a5c4ab71c7447bf4 - () https://git.kernel.org/stable/c/094bf5670e762afa243d2c41a5c4ab71c7447bf4 -
References () https://git.kernel.org/stable/c/1ab19c5de4c537ec0d9b21020395a5b5a6c059b2 - () https://git.kernel.org/stable/c/1ab19c5de4c537ec0d9b21020395a5b5a6c059b2 -
References () https://git.kernel.org/stable/c/38ce329534500bf4ae71f81df6a37a406cf187b4 - () https://git.kernel.org/stable/c/38ce329534500bf4ae71f81df6a37a406cf187b4 -
References () https://git.kernel.org/stable/c/86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d - () https://git.kernel.org/stable/c/86fd5b27db743a0ce0cc245e3a34813b2aa6ec1d -
References () https://git.kernel.org/stable/c/92869945cc5b78ee8a1ef90336fe070893e3458a - () https://git.kernel.org/stable/c/92869945cc5b78ee8a1ef90336fe070893e3458a -
References () https://git.kernel.org/stable/c/a61156314b66456ab6a291ed5deba1ebd002ab3c - () https://git.kernel.org/stable/c/a61156314b66456ab6a291ed5deba1ebd002ab3c -
References () https://git.kernel.org/stable/c/e87ef30fe73e7e10d2c85bdcc778dcec24dca553 - () https://git.kernel.org/stable/c/e87ef30fe73e7e10d2c85bdcc778dcec24dca553 -

21 May 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-21 15:15

Updated : 2024-12-30 19:50

NVD link : CVE-2021-47254

Mitre link : CVE-2021-47254

CVE.ORG link : CVE-2021-47254

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-416

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