Race condition in Linux kernel - CVE-2026-80886
Published: September 5, 2026
Vulnerability identifier: #VU147033
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80886
CWE-ID: CWE-362
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 race condition in the MSM serial driver console UART when userspace writes to the TTY device concurrently with kernel console output. A local user can write to the TTY device while the kernel printk path reconfigures the UART controller to cause a denial of service.
The issue is most likely to occur during system startup or shutdown.
Affected software
Linux kernel
How to mitigate CVE-2026-80886
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/22dd2777e6c180e1c945b00f6d18550979436324
- https://git.kernel.org/stable/c/2727744ccb5ca59090451451ee94f530b1be04a5
- https://git.kernel.org/stable/c/6acea62738ed4cae6746483026706a773b44dad7
- https://git.kernel.org/stable/c/abc1926c88c189e5d698b91ed6890e09ab5c321d
- https://git.kernel.org/stable/c/bb4296de5b538b575978c588cb3738ab8524d01a
- https://git.kernel.org/stable/c/d354716245192de2d203f2b35f22ab8dc13595e2
- https://git.kernel.org/stable/c/e3b42e326f4f30efcdc90bad5f5ba37e1cd91a47
- https://git.kernel.org/stable/c/f58e568dc308c8e13f7730c8de2da5ed514e540d