SB20260816211 - Integer overflow in Linux kernel core seq

Description

This security bulletin contains information about 1 vulnerability.

1) Integer overflow (CVE-ID: CVE-2026-74504)

CWE-ID: CWE-190 - Integer overflow

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 integer overflow in initialize_timer() when processing a userspace-driven ALSA timer bound to a sequencer queue. A local user can create a timer with a crafted hardware resolution value to cause a denial of service.

Exploitation is reachable by a user with access to /dev/snd/timer and /dev/snd/seq, and the fault can leave a spinlock held while interrupts are disabled, hanging the CPU.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/21e19688433452dfbbbe6b2bb670dea6eb92f0f6
• https://git.kernel.org/stable/c/42c6543ff27ea280334244458d4f52ec7133cc05
• https://git.kernel.org/stable/c/5260e195c53e898a4a76527d4bb2178f31795e78
• https://git.kernel.org/stable/c/d0e19932875746118e298b4c974f3b2d4aeb16fc