CVE-2022-50567

Kernel memory corruption via unchecked JFS metadata

Published Oct 22, 2025 · Updated Oct 22, 2025

Memory corruption in the Linux kernel JFS allocator allows local users to compromise the kernel via a crafted filesystem image. dbMount copies the on-disk dn_agl2size value into bmp->db_agl2size without enforcing its upper bound, so dbAllocAG performs an oversized shift and computes attacker-controlled block locations. Exploitation requires mounting the crafted JFS image and invoking allocation operations; resulting invalid reads and writes can disclose kernel data, corrupt memory, crash the kernel, or shut down the filesystem.

CVSS severity7.8
High
EPSS probability0.16%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in the Linux kernel JFS allocator allows local users to compromise the kernel via a crafted filesystem image. dbMount copies the on-disk dn_agl2size value into bmp->db_agl2size without enforcing its upper bound, so dbAllocAG performs an oversized shift and computes attacker-controlled block locations. Exploitation requires mounting the crafted JFS image and invoking allocation operations; resulting invalid reads and writes can disclose kernel data, corrupt memory, crash the kernel, or shut down the filesystem.

The record

CVE
CVE-2022-50567
Published
Oct 22, 2025
Updated
Oct 22, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0536f76a2bca83d1a3740517ba22cc93a44b3099
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2c575c8905f7a8b32d5611b91856b69bac2a5bf1
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3115313cf03113e87c87adee18ee49a20bbdb9ba
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <359616ce587e524107730504891afa4b1a8be58c
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3e997e4ce8ae7ab89d72334120f6aee49c5bbdbd
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <67973caae78e21ee46a7281aaa8ca364eb9c444f
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <898f706695682b9954f280d95e49fa86ffa55d08
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d3b486946a4e62c7ef6023f7d9c1d049051384ba
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <eea87acb6027be3dd4d3c57186bb22800d57fdda

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0536f76a2bca83d1a3740517ba22cc93a44b3099; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2c575c8905f7a8b32d5611b91856b69bac2a5bf1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3115313cf03113e87c87adee18ee49a20bbdb9ba; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <359616ce587e524107730504891afa4b1a8be58c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3e997e4ce8ae7ab89d72334120f6aee49c5bbdbd; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <67973caae78e21ee46a7281aaa8ca364eb9c444f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <898f706695682b9954f280d95e49fa86ffa55d08; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d3b486946a4e62c7ef6023f7d9c1d049051384ba; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <eea87acb6027be3dd4d3c57186bb22800d57fdda

Published CVSS scores

7.8Linux Kernel CVE TeamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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