SB20260918214 - Out-of-bounds read in Linux kernel ext4

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-92499)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to trigger an out-of-bounds read.

The vulnerability exists due to improper validation of directory entry offsets in ext4_readdir() when resuming directory reads from an invalid position in a corrupted directory. A local user can invoke directory reads that resume from an invalid position in a corrupted directory to trigger an out-of-bounds read.

The minimum safe directory entry length differs for encrypted, casefolded, and metadata-checksummed directories.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/64d445d40e5ea4c4d4d88880db753b370cb69161
• https://git.kernel.org/stable/c/b4c728577933753180e3e97f08424d5bcaff705e
• https://git.kernel.org/stable/c/bc4b7b0414c33b2c8898eb04386df0d21a13dad8