CVE-2022-48991

HIGH EPSS 16.3%
Published Oct 21, 20241y ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published Oct 21, 2024 1y ago
Last Modified Jun 17, 2026 1w ago

Description

In 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.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
16.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 14

VendorProductVersionRange
linuxlinux_kernel*≥4.8  –  <4.9.337
linuxlinux_kernel*≥4.10  –  <4.14.303
linuxlinux_kernel*≥4.15  –  <4.19.270
linuxlinux_kernel*≥4.20  –  <5.4.227
linuxlinux_kernel*≥5.5  –  <5.10.159
linuxlinux_kernel*≥5.11  –  <5.15.83
linuxlinux_kernel*≥5.16  –  <6.0.13
linuxlinux_kernel6.1any
linuxlinux_kernel6.1any
linuxlinux_kernel6.1any
linuxlinux_kernel6.1any
linuxlinux_kernel6.1any
linuxlinux_kernel6.1any
linuxlinux_kernel6.1any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/1a3f8c6cd29d9078cc81b29d39d0e9ae1d6a03c3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/275c626c131cfe141beeb6c575e31fa53d32da19
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5450535901d89a5dcca5fbbc59a24fe89caeb465
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5ffc2a75534d9d74d49760f983f8eb675fa63d69
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7f445ca2e0e59c7971d0b7b853465e50844ab596
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c23105673228c349739e958fa33955ed8faddcaf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f268f6cf875f3220afc77bdd0bf1bb136eb54db9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ff2a1a6f869650aec99e9d070b5ab625bfbc5bc3
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1a3f8c6cd29d9078cc81b29d39d0e9ae1d6a03c3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/275c626c131cfe141beeb6c575e31fa53d32da19
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5450535901d89a5dcca5fbbc59a24fe89caeb465
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5ffc2a75534d9d74d49760f983f8eb675fa63d69
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7f445ca2e0e59c7971d0b7b853465e50844ab596
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c23105673228c349739e958fa33955ed8faddcaf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f268f6cf875f3220afc77bdd0bf1bb136eb54db9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ff2a1a6f869650aec99e9d070b5ab625bfbc5bc3
    Patch