CVE-2023-52805

Kernel memory corruption via unchecked JFS index

Published May 21, 2024 · Updated Aug 5, 2026

Out-of-bounds access in Linux JFS allows local users to corrupt kernel memory by mounting a crafted filesystem image. The diAlloc path trusts the allocation-group number derived from on-disk IAG metadata and uses it to index db_active, im_aglock, and im_agctl without validating the array bound. A local session and a mounted malicious JFS image are required; subsequent file creation can cause kernel reads and writes outside the arrays, a kernel oops, or filesystem failure.

CVSS severity7.8
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in Linux JFS allows local users to corrupt kernel memory by mounting a crafted filesystem image. The diAlloc path trusts the allocation-group number derived from on-disk IAG metadata and uses it to index db_active, im_aglock, and im_agctl without validating the array bound. A local session and a mounted malicious JFS image are required; subsequent file creation can cause kernel reads and writes outside the arrays, a kernel oops, or filesystem failure.

The record

CVE
CVE-2023-52805
Published
May 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-129, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <05d9ea1ceb62a55af6727a69269a4fd310edf483
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1708d0a9917fea579cc9da3d87b154285abd2cd8
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1ba7df5457dc1c1071c5f92ac11323533a6430e1
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2308d0fb0dc32446b4e6ca37cd09c30374bb64e9
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <64f062baf202b82f54987a3f614a6c8f3e466641
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <665b44e55c2767a4f899c3b18f49e9e1c9983777
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7467ca10a5ff09b0e87edf6c4d2a4bfdee69cf2c
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8c68af2af697ba2ba3b138be0c6d72e2ce3a3d6d
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cf7e3e84df36a9953796c737f080712f631d7083
  10. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <05d9ea1ceb62a55af6727a69269a4fd310edf483; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1708d0a9917fea579cc9da3d87b154285abd2cd8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1ba7df5457dc1c1071c5f92ac11323533a6430e1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2308d0fb0dc32446b4e6ca37cd09c30374bb64e9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <64f062baf202b82f54987a3f614a6c8f3e466641; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <665b44e55c2767a4f899c3b18f49e9e1c9983777; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7467ca10a5ff09b0e87edf6c4d2a4bfdee69cf2c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8c68af2af697ba2ba3b138be0c6d72e2ce3a3d6d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cf7e3e84df36a9953796c737f080712f631d7083; version=2.6.12

Published CVSS scores

7.8Linux kernel CNACVSS: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

CWE-129Improper Validation of Array Index
T1068Exploitation for Privilege Escalation

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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