CVE-2022-48991

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2022-48991
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-48991.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2022-48991
Downstream
Related
Published
2024-10-21T20:06:08.312Z
Modified
2026-03-12T03:24:23.901764Z
Summary
mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths
Details

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.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48991.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
f3f0e1d2150b2b99da2cbdfaad000089efe9bf30
Fixed
275c626c131cfe141beeb6c575e31fa53d32da19
Fixed
c23105673228c349739e958fa33955ed8faddcaf
Fixed
ff2a1a6f869650aec99e9d070b5ab625bfbc5bc3
Fixed
5ffc2a75534d9d74d49760f983f8eb675fa63d69
Fixed
7f445ca2e0e59c7971d0b7b853465e50844ab596
Fixed
1a3f8c6cd29d9078cc81b29d39d0e9ae1d6a03c3
Fixed
5450535901d89a5dcca5fbbc59a24fe89caeb465
Fixed
f268f6cf875f3220afc77bdd0bf1bb136eb54db9

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-48991.json"