CVE-2022-48991

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2024-10-21. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

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 v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
17%
KEV
Not listed

Published

October 21, 2024

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Aug 5, 2026
No patch confirmed yet.
generic

mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f268f6cf875f3220afc77bdd0bf1bb136eb54db9
generic

mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5450535901d89a5dcca5fbbc59a24fe89caeb465
generic

mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1a3f8c6cd29d9078cc81b29d39d0e9ae1d6a03c3
generic

mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7f445ca2e0e59c7971d0b7b853465e50844ab596
generic

mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5ffc2a75534d9d74d49760f983f8eb675fa63d69
generic

mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ff2a1a6f869650aec99e9d070b5ab625bfbc5bc3
generic

mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c23105673228c349739e958fa33955ed8faddcaf
generic

mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/275c626c131cfe141beeb6c575e31fa53d32da19

Vendor Advisories for CVE-2022-48991(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatkernel-0:5.14.0-362.8.1.el9_32023-11-07redhat
linuxKernel @ 4.9.337—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 52× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 130 total refreshes for this CVE.

  1. 2026-08-07 16:24 UTCEPSS rescore
  2. 2026-08-06 13:44 UTCEPSS rescore
  3. 2026-08-05 19:15 UTCEPSS rescore
  4. 2026-08-05 09:35 UTCEG score recompute
  5. 2026-08-05 09:35 UTCGHSA enrichment
  6. 2026-08-04 15:07 UTCEPSS rescore
  7. 2026-08-04 11:44 UTCEG score recompute
  8. 2026-08-04 11:44 UTCGHSA enrichment
  9. 2026-08-04 10:35 UTCEPSS rescore
  10. 2026-08-04 09:48 UTCEG score recompute
  11. 2026-08-04 09:48 UTCGHSA enrichment
  12. 2026-08-03 10:33 UTCEPSS rescore
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  16. 2026-07-31 15:42 UTCOSV refresh
  17. 2026-07-30 16:25 UTCEPSS rescore
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  1. 2026-07-23 02:16 UTCEG score recompute
  2. 2026-07-22 23:03 UTCEG score recompute
  3. 2026-07-22 14:06 UTCEPSS rescore
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  5. 2026-07-21 15:23 UTCEPSS rescore
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  7. 2026-07-20 17:05 UTCEPSS rescore
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  17. 2026-07-15 01:58 UTCEPSS rescore
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  19. 2026-07-13 22:38 UTCOSV refresh
  20. 2026-07-13 22:28 UTCEPSS rescore
  21. 2026-07-13 22:28 UTCEPSS rescore
  22. 2026-07-13 06:11 UTCEPSS rescore
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  24. 2026-07-12 05:44 UTCEPSS rescore
  25. 2026-07-11 08:25 UTCEPSS rescore
  26. 2026-07-11 08:25 UTCEPSS rescore
  27. 2026-07-09 19:08 UTCEPSS rescore
  28. 2026-07-08 15:13 UTCEPSS rescore
  29. 2026-07-07 13:44 UTCEPSS rescore
  30. 2026-07-06 16:25 UTCEPSS rescore
  31. 2026-07-06 02:21 UTCEPSS rescore
  32. 2026-07-05 02:28 UTCEPSS rescore
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  41. 2026-06-27 03:07 UTCEPSS rescore
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  43. 2026-06-25 20:16 UTCOSV refresh
  44. 2026-06-25 13:48 UTCEPSS rescore
  45. 2026-06-25 13:48 UTCEPSS rescore
  46. 2026-06-24 14:03 UTCEPSS rescore
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  48. 2026-06-23 21:31 UTCEPSS rescore
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  50. 2026-06-22 14:24 UTCEPSS rescore
  51. 2026-06-21 14:55 UTCEPSS rescore
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  53. 2026-06-21 01:58 UTCEPSS rescore
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  55. 2026-06-19 19:24 UTCEPSS rescore
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  72. 2026-06-08 14:15 UTCEPSS rescore
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  74. 2026-06-08 09:28 UTCOSV refresh
  75. 2026-06-07 15:23 UTCEPSS rescore

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2022-48991?
CVE-2022-48991 is a high vulnerability published on October 21, 2024. 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.…
When was CVE-2022-48991 disclosed?
CVE-2022-48991 was first published in the National Vulnerability Database on October 21, 2024, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-48991 actively exploited?
CVE-2022-48991 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 83.5% of all scored CVEs.
What is the CVSS score of CVE-2022-48991?
CVE-2022-48991 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2022-48991?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-48991, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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