boxscore/security
CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2022-48991HIGH
Linux Linux — mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths
  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   L   N  U  H  H  H    7.8   .0025   16.8     —
AFFECTED
  Product  Versions                                    Fixed
  Linux    f3f0e1d2150b2b99da2cbdfaad000089efe9bf30 –  —
  Linux    4.8 –                                       4.9.337
TIMELINE
  Aug 22  Reserved by Linux
  Oct 21  Published (CNA: Linux)
  Aug 4   RESCORED — CVE-2022-48991 (Linux). CVSS 8.8 → 7.8 (NVD).
CWE-416 · CNA: Linux · CVSS v3.1 · 8 references · NVD status: Modified

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.

Lifecycle

Complete event history — 3 events, chronological
DateEventDetail
August 22, 2024ReservedReserved by Linux
October 21, 2024PublishedPublished (CNA: Linux)
August 4, 2026RESCOREDRESCORED — CVE-2022-48991 (Linux). CVSS 8.8 → 7.8 (NVD).

Affected

Affected products and packages — 2 rows
VendorProduct / PackageEcosystemVersion introducedFixed
LinuxLinux—f3f0e1d2150b2b99da2cbdfaad000089efe9bf30—
LinuxLinux—4.84.9.337

Weaknesses

CWE-416

References (8)

Related

Authoritative record: CVE-2022-48991 at cve.org

Vendors: linux

Weaknesses: CWE-416

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2022-48991 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.