CVE-2024-50279

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  2. Vulnerabilities (CVE)
  3. CVE-2024-50279

7.1 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.2

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

I

n the Linux kernel, the following vulnerability has been resolved: dm cache: fix out-of-bounds access to the dirty bitset when resizing dm-cache checks the dirty bits of the cache blocks to be dropped when shrinking the fast device, but an index bug in bitset iteration causes out-of-bounds access. Reproduce steps: 1. create a cache device of 1024 cache blocks (128 bytes dirty bitset) dmsetup create cmeta --table "0 8192 linear /dev/sdc 0" dmsetup create cdata --table "0 131072 linear /dev/sdc 8192" dmsetup create corig --table "0 524288 linear /dev/sdc 262144" dd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct dmsetup create cache --table "0 524288 cache /dev/mapper/cmeta \ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0" 2. shrink the fast device to 512 cache blocks, triggering out-of-bounds access to the dirty bitset (offset 0x80) dmsetup suspend cache dmsetup reload cdata --table "0 65536 linear /dev/sdc 8192" dmsetup resume cdata dmsetup resume cache KASAN reports: BUG: KASAN: vmalloc-out-of-bounds in cache_preresume+0x269/0x7b0 Read of size 8 at addr ffffc900000f3080 by task dmsetup/131 (...snip...) The buggy address belongs to the virtual mapping at [ffffc900000f3000, ffffc900000f5000) created by: cache_ctr+0x176a/0x35f0 (...snip...) Memory state around the buggy address: ffffc900000f2f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc900000f3000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc900000f3080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc900000f3100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc900000f3180: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 Fix by making the index post-incremented.

References
Link Resource
https://git.kernel.org/stable/c/3b02c40ff10fdf83cc545850db208de855ebe22c Patch
https://git.kernel.org/stable/c/4fa4feb873cea0e9d6ff883b37cca6f33169d8b4 Patch
https://git.kernel.org/stable/c/56507203e1b6127967ec2b51fb0b23a0d4af1334 Patch
https://git.kernel.org/stable/c/792227719725497ce10a8039803bec13f89f8910 Patch
https://git.kernel.org/stable/c/8501e38dc9e0060814c4085815fc83da3e6d43bf Patch
https://git.kernel.org/stable/c/e57648ce325fa405fe6bbd0e6a618ced7c301a2d Patch
https://git.kernel.org/stable/c/ee1f74925717ab36f6a091104c170639501ce818 Patch
https://git.kernel.org/stable/c/ff1dd8a04c30e8d4e2fd5c83198ca672eb6a9e7f Patch
https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
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:6.12:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12:rc6:*:*:*:*:*:*
History

03 Nov 2025, 23:17

Type Values Removed Values Added
References
  • () https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html -

03 Nov 2025, 21:17

Type Values Removed Values Added
References
  • () https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html -

27 Nov 2024, 16:01

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/3b02c40ff10fdf83cc545850db208de855ebe22c - () https://git.kernel.org/stable/c/3b02c40ff10fdf83cc545850db208de855ebe22c - Patch
References () https://git.kernel.org/stable/c/4fa4feb873cea0e9d6ff883b37cca6f33169d8b4 - () https://git.kernel.org/stable/c/4fa4feb873cea0e9d6ff883b37cca6f33169d8b4 - Patch
References () https://git.kernel.org/stable/c/56507203e1b6127967ec2b51fb0b23a0d4af1334 - () https://git.kernel.org/stable/c/56507203e1b6127967ec2b51fb0b23a0d4af1334 - Patch
References () https://git.kernel.org/stable/c/792227719725497ce10a8039803bec13f89f8910 - () https://git.kernel.org/stable/c/792227719725497ce10a8039803bec13f89f8910 - Patch
References () https://git.kernel.org/stable/c/8501e38dc9e0060814c4085815fc83da3e6d43bf - () https://git.kernel.org/stable/c/8501e38dc9e0060814c4085815fc83da3e6d43bf - Patch
References () https://git.kernel.org/stable/c/e57648ce325fa405fe6bbd0e6a618ced7c301a2d - () https://git.kernel.org/stable/c/e57648ce325fa405fe6bbd0e6a618ced7c301a2d - Patch
References () https://git.kernel.org/stable/c/ee1f74925717ab36f6a091104c170639501ce818 - () https://git.kernel.org/stable/c/ee1f74925717ab36f6a091104c170639501ce818 - Patch
References () https://git.kernel.org/stable/c/ff1dd8a04c30e8d4e2fd5c83198ca672eb6a9e7f - () https://git.kernel.org/stable/c/ff1dd8a04c30e8d4e2fd5c83198ca672eb6a9e7f - Patch
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.1
First Time Linux
Linux linux Kernel
CWE CWE-125

19 Nov 2024, 21:57

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dm cache: corrige el acceso fuera de los límites al conjunto de bits sucio al cambiar el tamaño dm-cache verifica los bits sucios de los bloques de caché que se deben descartar al reducir el dispositivo rápido, pero un error de índice en la iteración del conjunto de bits provoca un acceso fuera de los límites. Reproducir los pasos: 1. crear un dispositivo de caché de 1024 bloques de caché (128 bytes de bitset sucio) dmsetup create cmeta --table "0 8192 linear /dev/sdc 0" dmsetup create cdata --table "0 131072 linear /dev/sdc 8192" dmsetup create corig --table "0 524288 linear /dev/sdc 262144" dd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct dmsetup create cache --table "0 524288 cache /dev/mapper/cmeta \ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0" 2. reducir el dispositivo rápido a 512 bloques de caché, lo que activa el acceso fuera de los límites al bitset sucio. bitset (offset 0x80) dmsetup suspend cache dmsetup reload cdata --table "0 65536 linear /dev/sdc 8192" dmsetup resume cdata dmsetup resume cache KASAN informa: ERROR: KASAN: vmalloc-out-of-bounds en cache_preresume+0x269/0x7b0 Lectura de tamaño 8 en la dirección ffffc900000f3080 por la tarea dmsetup/131 (...snip...) La dirección con errores pertenece al mapeo virtual en [ffffc900000f3000, ffffc900000f5000) creado por: cache_ctr+0x176a/0x35f0 (...snip...) Estado de la memoria alrededor de la dirección con errores: ffffc900000f2f80: f8 f8 f8 f8 f8 f8 ...

19 Nov 2024, 02:16

Type Values Removed Values Added
New CVE
Information

Published : 2024-11-19 02:16

Updated : 2025-11-03 23:17

NVD link : CVE-2024-50279

Mitre link : CVE-2024-50279

CVE.ORG link : CVE-2024-50279

JSON object : View

Products Affected

linux

CWE
CWE-125

Out-of-bounds Read