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Review reviewHigh

CVE-2023-54139

Linux

In the Linux kernel, the following vulnerability has been resolved: tracing/user_events: Ensure write index cannot be negative The write index indicates which event the data is for and accesses a per-file array. The index is passed by user processes during write() calls as the first 4 bytes. Ensure that it cannot be negative by returning -EINVAL to prevent out of bounds accesses. Update ftrace self-test to ensure this occurs properly.

CVSS
7.8
EPSS
0.13%
3.29% percentile
CISA KEV
Not listed
Published
2025.12.24
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.13%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: tracing/user_events: Ensure write index cannot be negative The write index indicates which event the data is for and accesses a per-file array. The index is passed by user processes during write() calls as the first 4 bytes. Ensure that it cannot be negative by returning -EINVAL to prevent out of bounds accesses. Update ftrace self-test to ensure this occurs properly.

Affected product and versions

Product
Linux
Affected versions
>= 7f5a08c79df35e68f1a43033450c5050f12bc155 < 0489c2b2c3104b89f078dbcec8c744dfc157d3e9, >= 7f5a08c79df35e68f1a43033450c5050f12bc155 < 4fe46b5adf18e3dc606e62c9e6a0413398a17572, >= 7f5a08c79df35e68f1a43033450c5050f12bc155 < fa7f2f5d1739452280c22727c4384a52b72ab5de, >= 7f5a08c79df35e68f1a43033450c5050f12bc155 < cd98c93286a30cc4588dfd02453bec63c2f4acf4, >= 5.18
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available