CVE-2024-39276

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2024-39276
In the Linux kernel, the following vulnerability has been resolved: ext4: fix mb_cache_entry's e_refcnt leak in ext4_xattr_block_cache_find() Syzbot reports a warning as follows: ============================================ WARNING: CPU: 0 PID: 5075 at fs/mbcache.c:419 mb_cache_destroy+0x224/0x290 Modules linked in: CPU: 0 PID: 5075 Comm: syz-executor199 Not tainted 6.9.0-rc6-gb947cc5bf6d7 RIP: 0010:mb_cache_destroy+0x224/0x290 fs/mbcache.c:419 Call Trace: <TASK> ext4_put_super+0x6d4/0xcd0 fs/ext4/super.c:1375 generic_shutdown_super+0x136/0x2d0 fs/super.c:641 kill_block_super+0x44/0x90 fs/super.c:1675 ext4_kill_sb+0x68/0xa0 fs/ext4/super.c:7327 [...] ============================================ This is because when finding an entry in ext4_xattr_block_cache_find(), if ext4_sb_bread() returns -ENOMEM, the ce's e_refcnt, which has already grown in the __entry_find(), won't be put away, and eventually trigger the above issue in mb_cache_destroy() due to reference count leakage. So call mb_cache_entry_put() on the -ENOMEM error branch as a quick fix.

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 HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/0c0b4a49d3e7f49690a6827a41faeffad5df7e21 Patch
https://git.kernel.org/stable/c/681ff9a09accd8a4379f8bd30b7a1641ee19bb3e Patch
https://git.kernel.org/stable/c/76dc776153a47372719d664e0fc50d6355791abb Patch
https://git.kernel.org/stable/c/896a7e7d0d555ad8b2b46af0c2fa7de7467f9483 Patch
https://git.kernel.org/stable/c/9ad75e78747b5a50dc5a52f0f8e92e920a653f16 Patch
https://git.kernel.org/stable/c/a95df6f04f2c37291adf26a74205cde0314d4577 Patch
https://git.kernel.org/stable/c/b37c0edef4e66fb21a2fbc211471195a383e5ab8 Patch
https://git.kernel.org/stable/c/e941b712e758f615d311946bf98216e79145ccd9 Patch
https://git.kernel.org/stable/c/0c0b4a49d3e7f49690a6827a41faeffad5df7e21 Patch
https://git.kernel.org/stable/c/681ff9a09accd8a4379f8bd30b7a1641ee19bb3e Patch
https://git.kernel.org/stable/c/76dc776153a47372719d664e0fc50d6355791abb Patch
https://git.kernel.org/stable/c/896a7e7d0d555ad8b2b46af0c2fa7de7467f9483 Patch
https://git.kernel.org/stable/c/9ad75e78747b5a50dc5a52f0f8e92e920a653f16 Patch
https://git.kernel.org/stable/c/a95df6f04f2c37291adf26a74205cde0314d4577 Patch
https://git.kernel.org/stable/c/b37c0edef4e66fb21a2fbc211471195a383e5ab8 Patch
https://git.kernel.org/stable/c/e941b712e758f615d311946bf98216e79145ccd9 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:*:*:*:*:*:*:*:*
History

24 Mar 2025, 17:28

Type Values Removed Values Added
First Time Linux linux Kernel
Linux
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CWE NVD-CWE-Other
References () https://git.kernel.org/stable/c/0c0b4a49d3e7f49690a6827a41faeffad5df7e21 - () https://git.kernel.org/stable/c/0c0b4a49d3e7f49690a6827a41faeffad5df7e21 - Patch
References () https://git.kernel.org/stable/c/681ff9a09accd8a4379f8bd30b7a1641ee19bb3e - () https://git.kernel.org/stable/c/681ff9a09accd8a4379f8bd30b7a1641ee19bb3e - Patch
References () https://git.kernel.org/stable/c/76dc776153a47372719d664e0fc50d6355791abb - () https://git.kernel.org/stable/c/76dc776153a47372719d664e0fc50d6355791abb - Patch
References () https://git.kernel.org/stable/c/896a7e7d0d555ad8b2b46af0c2fa7de7467f9483 - () https://git.kernel.org/stable/c/896a7e7d0d555ad8b2b46af0c2fa7de7467f9483 - Patch
References () https://git.kernel.org/stable/c/9ad75e78747b5a50dc5a52f0f8e92e920a653f16 - () https://git.kernel.org/stable/c/9ad75e78747b5a50dc5a52f0f8e92e920a653f16 - Patch
References () https://git.kernel.org/stable/c/a95df6f04f2c37291adf26a74205cde0314d4577 - () https://git.kernel.org/stable/c/a95df6f04f2c37291adf26a74205cde0314d4577 - Patch
References () https://git.kernel.org/stable/c/b37c0edef4e66fb21a2fbc211471195a383e5ab8 - () https://git.kernel.org/stable/c/b37c0edef4e66fb21a2fbc211471195a383e5ab8 - Patch
References () https://git.kernel.org/stable/c/e941b712e758f615d311946bf98216e79145ccd9 - () https://git.kernel.org/stable/c/e941b712e758f615d311946bf98216e79145ccd9 - Patch

21 Nov 2024, 09:27

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/0c0b4a49d3e7f49690a6827a41faeffad5df7e21 - () https://git.kernel.org/stable/c/0c0b4a49d3e7f49690a6827a41faeffad5df7e21 -
References () https://git.kernel.org/stable/c/681ff9a09accd8a4379f8bd30b7a1641ee19bb3e - () https://git.kernel.org/stable/c/681ff9a09accd8a4379f8bd30b7a1641ee19bb3e -
References () https://git.kernel.org/stable/c/76dc776153a47372719d664e0fc50d6355791abb - () https://git.kernel.org/stable/c/76dc776153a47372719d664e0fc50d6355791abb -
References () https://git.kernel.org/stable/c/896a7e7d0d555ad8b2b46af0c2fa7de7467f9483 - () https://git.kernel.org/stable/c/896a7e7d0d555ad8b2b46af0c2fa7de7467f9483 -
References () https://git.kernel.org/stable/c/9ad75e78747b5a50dc5a52f0f8e92e920a653f16 - () https://git.kernel.org/stable/c/9ad75e78747b5a50dc5a52f0f8e92e920a653f16 -
References () https://git.kernel.org/stable/c/a95df6f04f2c37291adf26a74205cde0314d4577 - () https://git.kernel.org/stable/c/a95df6f04f2c37291adf26a74205cde0314d4577 -
References () https://git.kernel.org/stable/c/b37c0edef4e66fb21a2fbc211471195a383e5ab8 - () https://git.kernel.org/stable/c/b37c0edef4e66fb21a2fbc211471195a383e5ab8 -
References () https://git.kernel.org/stable/c/e941b712e758f615d311946bf98216e79145ccd9 - () https://git.kernel.org/stable/c/e941b712e758f615d311946bf98216e79145ccd9 -

05 Nov 2024, 15:35

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: soluciona la fuga de e_refcnt de mb_cache_entry en ext4_xattr_block_cache_find() Syzbot informa una advertencia de la siguiente manera: ======================= ======================= ADVERTENCIA: CPU: 0 PID: 5075 en fs/mbcache.c:419 mb_cache_destroy+0x224/0x290 Módulos vinculados en: CPU: 0 PID: 5075 Comm: syz-executor199 No contaminado 6.9.0-rc6-gb947cc5bf6d7 RIP: 0010:mb_cache_destroy+0x224/0x290 fs/mbcache.c:419 Seguimiento de llamadas: ext4_put_super+0x6d4/0xcd0 fs/ext4/super .c:1375 generic_shutdown_super+0x136/0x2d0 fs/super.c:641 kill_block_super+0x44/0x90 fs/super.c:1675 ext4_kill_sb+0x68/0xa0 fs/ext4/super.c:7327 [...] === ========================================= Esto se debe a que al encontrar una entrada en ext4_xattr_block_cache_find (), si ext4_sb_bread() devuelve -ENOMEM, el e_refcnt del ce, que ya ha crecido en __entry_find(), no se guardará y, eventualmente, desencadenará el problema anterior en mb_cache_destroy() debido a una fuga del recuento de referencias. Entonces llame a mb_cache_entry_put() en la rama de error -ENOMEM como solución rápida.

25 Jun 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-06-25 15:15

Updated : 2025-03-24 17:28

NVD link : CVE-2024-39276

Mitre link : CVE-2024-39276

CVE.ORG link : CVE-2024-39276

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-Other