Use-after-free in Linux kernel - CVE-2026-31444

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Main Vulnerability Database Vulnerabilities #VU127699

Use-after-free in Linux kernel - CVE-2026-31444

Published: April 24, 2026


Vulnerability identifier: #VU127699
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-31444
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a use-after-free in smb_grant_oplock() when publishing oplock state to internal lists during concurrent access. A local user can trigger concurrent oplock operations to cause a denial of service.

The issue also involves a NULL pointer dereference in the same publication sequence.


Affected software

Linux kernel
Ubuntu
linux-gcp-6.17 (Ubuntu package)
linux-oracle-6.17 (Ubuntu package)
linux-oem-6.17 (Ubuntu package)

How to mitigate CVE-2026-31444

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-gcp-6.17 (Ubuntu package) - addressed in versions 6.17.0-1018.20~24.04.1, 6.17.0-1021.24~24.04.1
linux-oracle-6.17 (Ubuntu package) - addressed in versions 6.17.0-1019.19~24.04.3, 6.17.0-1019.19~24.04.3+1
linux-oem-6.17 (Ubuntu package) - update to 6.17.0-1030.30

External References

Related Security Bulletins