CVE-2022-48991

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  2. Vulnerabilities (CVE)
  3. CVE-2022-48991

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

I

n the Linux kernel, the following vulnerability has been resolved: mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths Any codepath that zaps page table entries must invoke MMU notifiers to ensure that secondary MMUs (like KVM) don't keep accessing pages which aren't mapped anymore. Secondary MMUs don't hold their own references to pages that are mirrored over, so failing to notify them can lead to page use-after-free. I'm marking this as addressing an issue introduced in commit f3f0e1d2150b ("khugepaged: add support of collapse for tmpfs/shmem pages"), but most of the security impact of this only came in commit 27e1f8273113 ("khugepaged: enable collapse pmd for pte-mapped THP"), which actually omitted flushes for the removal of present PTEs, not just for the removal of empty page tables.

References
Link Resource
https://git.kernel.org/stable/c/1a3f8c6cd29d9078cc81b29d39d0e9ae1d6a03c3 Patch
https://git.kernel.org/stable/c/275c626c131cfe141beeb6c575e31fa53d32da19 Patch
https://git.kernel.org/stable/c/5450535901d89a5dcca5fbbc59a24fe89caeb465 Patch
https://git.kernel.org/stable/c/5ffc2a75534d9d74d49760f983f8eb675fa63d69 Patch
https://git.kernel.org/stable/c/7f445ca2e0e59c7971d0b7b853465e50844ab596 Patch
https://git.kernel.org/stable/c/c23105673228c349739e958fa33955ed8faddcaf Patch
https://git.kernel.org/stable/c/f268f6cf875f3220afc77bdd0bf1bb136eb54db9 Patch
https://git.kernel.org/stable/c/ff2a1a6f869650aec99e9d070b5ab625bfbc5bc3 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:6.1:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc7:*:*:*:*:*:*
History

07 Nov 2024, 19:36

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*
CWE CWE-416
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8
First Time Linux
Linux linux Kernel
References () https://git.kernel.org/stable/c/1a3f8c6cd29d9078cc81b29d39d0e9ae1d6a03c3 - () https://git.kernel.org/stable/c/1a3f8c6cd29d9078cc81b29d39d0e9ae1d6a03c3 - Patch
References () https://git.kernel.org/stable/c/275c626c131cfe141beeb6c575e31fa53d32da19 - () https://git.kernel.org/stable/c/275c626c131cfe141beeb6c575e31fa53d32da19 - Patch
References () https://git.kernel.org/stable/c/5450535901d89a5dcca5fbbc59a24fe89caeb465 - () https://git.kernel.org/stable/c/5450535901d89a5dcca5fbbc59a24fe89caeb465 - Patch
References () https://git.kernel.org/stable/c/5ffc2a75534d9d74d49760f983f8eb675fa63d69 - () https://git.kernel.org/stable/c/5ffc2a75534d9d74d49760f983f8eb675fa63d69 - Patch
References () https://git.kernel.org/stable/c/7f445ca2e0e59c7971d0b7b853465e50844ab596 - () https://git.kernel.org/stable/c/7f445ca2e0e59c7971d0b7b853465e50844ab596 - Patch
References () https://git.kernel.org/stable/c/c23105673228c349739e958fa33955ed8faddcaf - () https://git.kernel.org/stable/c/c23105673228c349739e958fa33955ed8faddcaf - Patch
References () https://git.kernel.org/stable/c/f268f6cf875f3220afc77bdd0bf1bb136eb54db9 - () https://git.kernel.org/stable/c/f268f6cf875f3220afc77bdd0bf1bb136eb54db9 - Patch
References () https://git.kernel.org/stable/c/ff2a1a6f869650aec99e9d070b5ab625bfbc5bc3 - () https://git.kernel.org/stable/c/ff2a1a6f869650aec99e9d070b5ab625bfbc5bc3 - Patch

23 Oct 2024, 15:13

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/khugepaged: invocar notificadores MMU en rutas de colapso de shmem/archivo Cualquier ruta de código que elimine las entradas de la tabla de páginas debe invocar notificadores MMU para garantizar que las MMU secundarias (como KVM) no sigan accediendo a páginas que ya no están asignadas. Las MMU secundarias no mantienen sus propias referencias a páginas que se reflejan, por lo que no notificarlas puede provocar el use-after-free de la página. Estoy marcando esto como una solución a un problema introducido en el commit f3f0e1d2150b ("khugepaged: agregar compatibilidad con el colapso para páginas tmpfs/shmem"), pero la mayor parte del impacto de seguridad de esto solo se produjo en el commit 27e1f8273113 ("khugepaged: habilitar el colapso pmd para THP asignado a pte"), que en realidad omitió los vaciados para la eliminación de PTE actuales, no solo para la eliminación de tablas de páginas vacías.

21 Oct 2024, 20:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-10-21 20:15

Updated : 2024-11-07 19:36

NVD link : CVE-2022-48991

Mitre link : CVE-2022-48991

CVE.ORG link : CVE-2022-48991

JSON object : View

Products Affected

linux

CWE
CWE-416

Use After Free