CVE - CVE-2022-48991

CVE-ID
CVE-2022-48991	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/1a3f8c6cd29d9078cc81b29d39d0e9ae1d6a03c3 URL:https://git.kernel.org/stable/c/1a3f8c6cd29d9078cc81b29d39d0e9ae1d6a03c3 MISC:https://git.kernel.org/stable/c/275c626c131cfe141beeb6c575e31fa53d32da19 URL:https://git.kernel.org/stable/c/275c626c131cfe141beeb6c575e31fa53d32da19 MISC:https://git.kernel.org/stable/c/5450535901d89a5dcca5fbbc59a24fe89caeb465 URL:https://git.kernel.org/stable/c/5450535901d89a5dcca5fbbc59a24fe89caeb465 MISC:https://git.kernel.org/stable/c/5ffc2a75534d9d74d49760f983f8eb675fa63d69 URL:https://git.kernel.org/stable/c/5ffc2a75534d9d74d49760f983f8eb675fa63d69 MISC:https://git.kernel.org/stable/c/7f445ca2e0e59c7971d0b7b853465e50844ab596 URL:https://git.kernel.org/stable/c/7f445ca2e0e59c7971d0b7b853465e50844ab596 MISC:https://git.kernel.org/stable/c/c23105673228c349739e958fa33955ed8faddcaf URL:https://git.kernel.org/stable/c/c23105673228c349739e958fa33955ed8faddcaf MISC:https://git.kernel.org/stable/c/f268f6cf875f3220afc77bdd0bf1bb136eb54db9 URL:https://git.kernel.org/stable/c/f268f6cf875f3220afc77bdd0bf1bb136eb54db9 MISC:https://git.kernel.org/stable/c/ff2a1a6f869650aec99e9d070b5ab625bfbc5bc3 URL:https://git.kernel.org/stable/c/ff2a1a6f869650aec99e9d070b5ab625bfbc5bc3
Assigning CNA
kernel.org
Date Record Created
20240822	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240822)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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