CVE-2022-50849

Kernel oops via unmapped ramoops lowmem access

Published Dec 30, 2025 · Updated Dec 30, 2025

Denial of service in the Linux kernel pstore RAM backend allows local users to trigger a kernel oops by reading /proc/kcore. persistent_ram_vmap maps reserved ramoops pages through vmap without VM_IOREMAP, while aligned_vread later passes their page structures to kmap_atomic as though direct lowmem mappings existed. The trigger requires a device configured with the pstore RAM backend and access to /proc/kcore; the bounded consequence is a kernel oops.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel pstore RAM backend allows local users to trigger a kernel oops by reading /proc/kcore. persistent_ram_vmap maps reserved ramoops pages through vmap without VM_IOREMAP, while aligned_vread later passes their page structures to kmap_atomic as though direct lowmem mappings existed. The trigger requires a device configured with the pstore RAM backend and access to /proc/kcore; the bounded consequence is a kernel oops.

The record

CVE
CVE-2022-50849
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.4
  2. Affected versionversion=404a6043385de17273624b076599669db5ad891f <1579bed1613802a323a1e14567faa95c149e105e
  3. Affected versionversion=404a6043385de17273624b076599669db5ad891f <295f59cd2cdeed841850d02dddde3a122cbf6fc6
  4. Affected versionversion=404a6043385de17273624b076599669db5ad891f <2f82381d0681b10f9ddd27be98c27363b5a3cd1c
  5. Affected versionversion=404a6043385de17273624b076599669db5ad891f <4d3126f242a0090342ffe925c35fb4f4252b7562
  6. Affected versionversion=404a6043385de17273624b076599669db5ad891f <69dbff7d2681c55a4d979fd9b75576303e69979f
  7. Affected versionversion=404a6043385de17273624b076599669db5ad891f <6d9460214e363e1f3d0756ee5d947e76e3e6f86c
  8. Affected versionversion=404a6043385de17273624b076599669db5ad891f <e6b842741b4f39007215fd7e545cb55aa3d358a2
  9. Affected versionversion=404a6043385de17273624b076599669db5ad891f <ebc73c4f266281e2cad1a372ecd81572d95375b6
  10. Affected versionversion=404a6043385de17273624b076599669db5ad891f <fdebcc33b663d2e8da937653ddfbfc1315047eaa

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.4; version=404a6043385de17273624b076599669db5ad891f <1579bed1613802a323a1e14567faa95c149e105e; version=404a6043385de17273624b076599669db5ad891f <295f59cd2cdeed841850d02dddde3a122cbf6fc6; version=404a6043385de17273624b076599669db5ad891f <2f82381d0681b10f9ddd27be98c27363b5a3cd1c; version=404a6043385de17273624b076599669db5ad891f <4d3126f242a0090342ffe925c35fb4f4252b7562; version=404a6043385de17273624b076599669db5ad891f <69dbff7d2681c55a4d979fd9b75576303e69979f; version=404a6043385de17273624b076599669db5ad891f <6d9460214e363e1f3d0756ee5d947e76e3e6f86c; version=404a6043385de17273624b076599669db5ad891f <e6b842741b4f39007215fd7e545cb55aa3d358a2; version=404a6043385de17273624b076599669db5ad891f <ebc73c4f266281e2cad1a372ecd81572d95375b6; version=404a6043385de17273624b076599669db5ad891f <fdebcc33b663d2e8da937653ddfbfc1315047eaa

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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