SB20260816178 - Improper input validation in Linux kernel sched

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-74544)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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]

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

The vulnerability exists due to improper input validation in the cls_u32 packet classifier when processing a crafted filter configuration with varoffset enabled. A local user can supply an out-of-range offshift value to trigger shift-out-of-bounds behavior and cause a denial of service.

Exploitation is possible by an unprivileged user via user or network namespaces.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/313cb9ffc4101a885d791facf4b5ea3d5e06144d
• https://git.kernel.org/stable/c/aef96eead2860cbfa371e4471d4f04412213b958