CVE-2023-52799

Kernel memory corruption via unchecked JFS tree index

Published May 21, 2024 · Updated Aug 5, 2026

Out-of-bounds access in Linux JFS allows local users to corrupt kernel memory through operations on a writable mounted JFS volume. The dbFindLeaf function indexes tp->dm_stree without first bounding the index for the dmtree type while searching for free blocks. An unprivileged user with write access to a mounted JFS volume can drive the invalid walk through ordinary file creation, causing memory disclosure, metadata corruption, or a kernel crash.

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 through operations on a writable mounted JFS volume. The dbFindLeaf function indexes tp->dm_stree without first bounding the index for the dmtree type while searching for free blocks. An unprivileged user with write access to a mounted JFS volume can drive the invalid walk through ordinary file creation, causing memory disclosure, metadata corruption, or a kernel crash.

The record

CVE
CVE-2023-52799
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

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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 <20f9310a18e3e99fc031e036fcbed67105ae1859
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <22cad8bc1d36547cdae0eef316c47d917ce3147c
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <81aa58cd8495b8c3b527f58ccbe19478d8087f61
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <86df90f3fea7c5591f05c8a0010871d435e83046
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <87c681ab49e99039ff2dd3e71852417381b13878
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <88b7894a8f8705bf4e7ea90b10229376abf14514
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a50b796d36719757526ee094c703378895ab5e67
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <da3da5e1e6f71c21d8e6149d7076d936ef5d4cb9
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ecfb47f13b08b02cf28b7b50d4941eefa21954d2
  10. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <20f9310a18e3e99fc031e036fcbed67105ae1859; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <22cad8bc1d36547cdae0eef316c47d917ce3147c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <81aa58cd8495b8c3b527f58ccbe19478d8087f61; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <86df90f3fea7c5591f05c8a0010871d435e83046; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <87c681ab49e99039ff2dd3e71852417381b13878; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <88b7894a8f8705bf4e7ea90b10229376abf14514; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a50b796d36719757526ee094c703378895ab5e67; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <da3da5e1e6f71c21d8e6149d7076d936ef5d4cb9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ecfb47f13b08b02cf28b7b50d4941eefa21954d2; 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
7.8NIST NVDCVSS: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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