Out-of-bounds read in Linux kernel - CVE-2026-92499

Vulnerability identifier: #VU151016

CSH Severity: Low

CVSS v4: 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]

CVE-ID: CVE-2026-92499

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

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.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

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

• Out-of-bounds read in Linux kernel ext4
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more