Integer underflow in Linux kernel - CVE-2026-98176
Published: October 15, 2026
Vulnerability identifier: #VU155945
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98176
CWE-ID: CWE-191
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to produce an incorrect EOP ring size field value.
The vulnerability exists due to integer underflow in the drm/amdkfd update_mqd() functions when calculating the EOP ring size field using an ffs() result of zero or one. A local user can trigger the affected calculation to produce an incorrect EOP ring size field value.
The advisory describes a theoretical condition: in practice, the ring buffer size cannot be less than 4096 bytes. It does not establish a reachable exploitation scenario.
Affected software
Linux kernel
How to mitigate CVE-2026-98176
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3