Infinite loop in Linux kernel - CVE-2026-99251
Published: November 3, 2026
Vulnerability identifier: #VU158990
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-99251
CWE-ID: CWE-835
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 an infinite retry loop in the Linux kernel Hyper-V driver's init_vp_index() function when selecting CPUs from a NUMA node that has no CPU in the HK_TYPE_MANAGED_IRQ housekeeping cpumask. A local user can trigger the affected channel initialization path under this CPU configuration to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-99251
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/15dd3429f0e76ca071657e480cb7e6ff3a1af730
- https://git.kernel.org/stable/c/32ea0a33e3a0fb7c10c601b43e1b2f6c06a3f5fd
- https://git.kernel.org/stable/c/7141331f2d245efc07175802a6bf76badec871ed
- https://git.kernel.org/stable/c/95fec47cdbf747b81ab22affd7252dda6050ad0c
- https://git.kernel.org/stable/c/b3993f6dc106ff416c7a613c631e1e0af451aed7
- https://git.kernel.org/stable/c/f561392afb44a8a42c54c1cfd3f33dace0b50537