CVE-2025-21712

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-21712
In the Linux kernel, the following vulnerability has been resolved: md/md-bitmap: Synchronize bitmap_get_stats() with bitmap lifetime After commit ec6bb299c7c3 ("md/md-bitmap: add 'sync_size' into struct md_bitmap_stats"), following panic is reported: Oops: general protection fault, probably for non-canonical address RIP: 0010:bitmap_get_stats+0x2b/0xa0 Call Trace: <TASK> md_seq_show+0x2d2/0x5b0 seq_read_iter+0x2b9/0x470 seq_read+0x12f/0x180 proc_reg_read+0x57/0xb0 vfs_read+0xf6/0x380 ksys_read+0x6c/0xf0 do_syscall_64+0x82/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e Root cause is that bitmap_get_stats() can be called at anytime if mddev is still there, even if bitmap is destroyed, or not fully initialized. Deferenceing bitmap in this case can crash the kernel. Meanwhile, the above commit start to deferencing bitmap->storage, make the problem easier to trigger. Fix the problem by protecting bitmap_get_stats() with bitmap_info.mutex.

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/032fa54f486eac5507976e7e31f079a767bc13a8 Patch
https://git.kernel.org/stable/c/237e19519c8ff6949f0ef57c4a0243f5b2b0fa18 Patch
https://git.kernel.org/stable/c/4e9316eee3885bfb311b4759513f2ccf37891c09 Patch
https://git.kernel.org/stable/c/52848a095b55a302af92f52ca0de5b3112059bb8 Patch
https://git.kernel.org/stable/c/8d28d0ddb986f56920ac97ae704cc3340a699a30 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:*:*:*:*:*:*:*:*
History

23 Oct 2025, 13:07

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/032fa54f486eac5507976e7e31f079a767bc13a8 - () https://git.kernel.org/stable/c/032fa54f486eac5507976e7e31f079a767bc13a8 - Patch
References () https://git.kernel.org/stable/c/237e19519c8ff6949f0ef57c4a0243f5b2b0fa18 - () https://git.kernel.org/stable/c/237e19519c8ff6949f0ef57c4a0243f5b2b0fa18 - Patch
References () https://git.kernel.org/stable/c/4e9316eee3885bfb311b4759513f2ccf37891c09 - () https://git.kernel.org/stable/c/4e9316eee3885bfb311b4759513f2ccf37891c09 - Patch
References () https://git.kernel.org/stable/c/52848a095b55a302af92f52ca0de5b3112059bb8 - () https://git.kernel.org/stable/c/52848a095b55a302af92f52ca0de5b3112059bb8 - Patch
References () https://git.kernel.org/stable/c/8d28d0ddb986f56920ac97ae704cc3340a699a30 - () https://git.kernel.org/stable/c/8d28d0ddb986f56920ac97ae704cc3340a699a30 - Patch
CWE NVD-CWE-noinfo
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux
Linux linux Kernel

07 Mar 2025, 18:15

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: md/md-bitmap: sincronizar bitmap_get_stats() con el tiempo de vida del mapa de bits Después de el commit ec6bb299c7c3 ("md/md-bitmap: agregar 'sync_size' en la estructura md_bitmap_stats"), se informa el siguiente pánico: Vaya: error de protección general, probablemente para una dirección no canónica RIP: 0010:bitmap_get_stats+0x2b/0xa0 Seguimiento de llamadas: md_seq_show+0x2d2/0x5b0 seq_read_iter+0x2b9/0x470 seq_read+0x12f/0x180 proc_reg_read+0x57/0xb0 vfs_read+0xf6/0x380 ksys_read+0x6c/0xf0 La causa principal es que bitmap_get_stats() se puede llamar en cualquier momento si mddev aún está allí, incluso si bitmap se destruye o no se inicializa por completo. La deferenciación de bitmap en este caso puede hacer que el kernel se bloquee. Mientras tanto, el commit anterior comienza a deferenciar bitmap-&gt;storage, lo que hace que el problema sea más fácil de desencadenar. Solucione el problema protegiendo bitmap_get_stats() con bitmap_info.mutex.
References
  • () https://git.kernel.org/stable/c/032fa54f486eac5507976e7e31f079a767bc13a8 -

27 Feb 2025, 13:15

Type Values Removed Values Added
References
  • () https://git.kernel.org/stable/c/52848a095b55a302af92f52ca0de5b3112059bb8 -

27 Feb 2025, 02:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-27 02:15

Updated : 2025-10-23 13:07

NVD link : CVE-2025-21712

Mitre link : CVE-2025-21712

CVE.ORG link : CVE-2025-21712

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo