CVE-2025-21694

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-21694
In the Linux kernel, the following vulnerability has been resolved: fs/proc: fix softlockup in __read_vmcore (part 2) Since commit 5cbcb62dddf5 ("fs/proc: fix softlockup in __read_vmcore") the number of softlockups in __read_vmcore at kdump time have gone down, but they still happen sometimes. In a memory constrained environment like the kdump image, a softlockup is not just a harmless message, but it can interfere with things like RCU freeing memory, causing the crashdump to get stuck. The second loop in __read_vmcore has a lot more opportunities for natural sleep points, like scheduling out while waiting for a data write to happen, but apparently that is not always enough. Add a cond_resched() to the second loop in __read_vmcore to (hopefully) get rid of the softlockups.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/649b266606bc413407ce315f710c8ce8a88ee30a Patch
https://git.kernel.org/stable/c/65c367bd9d4f43513c7f837df5753bea9561b836 Patch
https://git.kernel.org/stable/c/80828540dad0757b6337c6561d49c81038f38d87 Patch
https://git.kernel.org/stable/c/80da29deb88a3a907441fc35bb7bac309f31e713 Patch
https://git.kernel.org/stable/c/84c4ed15626574c9ac6c1039ba9c137a77bcc7f2 Patch
https://git.kernel.org/stable/c/a5a2ee8144c3897d37403a69118c3e3dc5713958 Patch
https://git.kernel.org/stable/c/cbc5dde0a461240046e8a41c43d7c3b76d5db952 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:6.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc7:*:*:*:*:*:*
History

14 Feb 2025, 15:46

Type Values Removed Values Added
CWE NVD-CWE-noinfo
CPE cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux linux Kernel
Linux
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fs/proc: fix softlockup in __read_vmcore (parte 2) Desde el commit 5cbcb62dddf5 ("fs/proc: fix softlockup in __read_vmcore"), la cantidad de softlockups en __read_vmcore en el momento de kdump ha disminuido, pero aún ocurren a veces. En un entorno con restricciones de memoria como la imagen kdump, un softlockup no es solo un mensaje inofensivo, sino que puede interferir con cosas como la liberación de memoria por parte de RCU, lo que hace que el crashdump se quede atascado. El segundo bucle en __read_vmcore tiene muchas más oportunidades para puntos de suspensión naturales, como programar la salida mientras se espera que se escriban datos, pero aparentemente eso no siempre es suficiente. Agregue un cond_resched() al segundo bucle en __read_vmcore para (con suerte) deshacerse de los softlockups.
References () https://git.kernel.org/stable/c/649b266606bc413407ce315f710c8ce8a88ee30a - () https://git.kernel.org/stable/c/649b266606bc413407ce315f710c8ce8a88ee30a - Patch
References () https://git.kernel.org/stable/c/65c367bd9d4f43513c7f837df5753bea9561b836 - () https://git.kernel.org/stable/c/65c367bd9d4f43513c7f837df5753bea9561b836 - Patch
References () https://git.kernel.org/stable/c/80828540dad0757b6337c6561d49c81038f38d87 - () https://git.kernel.org/stable/c/80828540dad0757b6337c6561d49c81038f38d87 - Patch
References () https://git.kernel.org/stable/c/80da29deb88a3a907441fc35bb7bac309f31e713 - () https://git.kernel.org/stable/c/80da29deb88a3a907441fc35bb7bac309f31e713 - Patch
References () https://git.kernel.org/stable/c/84c4ed15626574c9ac6c1039ba9c137a77bcc7f2 - () https://git.kernel.org/stable/c/84c4ed15626574c9ac6c1039ba9c137a77bcc7f2 - Patch
References () https://git.kernel.org/stable/c/a5a2ee8144c3897d37403a69118c3e3dc5713958 - () https://git.kernel.org/stable/c/a5a2ee8144c3897d37403a69118c3e3dc5713958 - Patch
References () https://git.kernel.org/stable/c/cbc5dde0a461240046e8a41c43d7c3b76d5db952 - () https://git.kernel.org/stable/c/cbc5dde0a461240046e8a41c43d7c3b76d5db952 - Patch

12 Feb 2025, 14:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-12 14:15

Updated : 2025-02-14 15:46

NVD link : CVE-2025-21694

Mitre link : CVE-2025-21694

CVE.ORG link : CVE-2025-21694

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo