CVE-2022-48991
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2022
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| f3f0e1d2150b2b99da2cbdfaad000089efe9bf30 | affected | git | 275c626c131cfe141beeb6c575e31fa53d32da19 | Unavailable | None listed |
| f3f0e1d2150b2b99da2cbdfaad000089efe9bf30 | affected | git | c23105673228c349739e958fa33955ed8faddcaf | Unavailable | None listed |
| f3f0e1d2150b2b99da2cbdfaad000089efe9bf30 | affected | git | ff2a1a6f869650aec99e9d070b5ab625bfbc5bc3 | Unavailable | None listed |
| f3f0e1d2150b2b99da2cbdfaad000089efe9bf30 | affected | git | 5ffc2a75534d9d74d49760f983f8eb675fa63d69 | Unavailable | None listed |
| f3f0e1d2150b2b99da2cbdfaad000089efe9bf30 | affected | git | 7f445ca2e0e59c7971d0b7b853465e50844ab596 | Unavailable | None listed |
| f3f0e1d2150b2b99da2cbdfaad000089efe9bf30 | affected | git | 1a3f8c6cd29d9078cc81b29d39d0e9ae1d6a03c3 | Unavailable | None listed |
| f3f0e1d2150b2b99da2cbdfaad000089efe9bf30 | affected | git | 5450535901d89a5dcca5fbbc59a24fe89caeb465 | Unavailable | None listed |
| f3f0e1d2150b2b99da2cbdfaad000089efe9bf30 | affected | git | f268f6cf875f3220afc77bdd0bf1bb136eb54db9 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 4.8 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 4.8 | Unavailable | None listed |
| 4.9.337 | unaffected | semver | Unavailable | 4.9.* | None listed |
| 4.14.303 | unaffected | semver | Unavailable | 4.14.* | None listed |
| 4.19.270 | unaffected | semver | Unavailable | 4.19.* | None listed |
| 5.4.227 | unaffected | semver | Unavailable | 5.4.* | None listed |
| 5.10.159 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.83 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.0.13 | unaffected | semver | Unavailable | 6.0.* | None listed |
| 6.1 | unaffected | original_commit_for_fix | Unavailable | * | None listed |