Division by zero in Linux kernel - CVE-2026-63931
Published: July 20, 2026
Vulnerability identifier: #VU138719
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-63931
CWE-ID: CWE-369
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 division by zero in the scd30_write_raw function when writing a zero fractional part to the sampling_frequency sysfs attribute. A local user can write a zero fractional value to the sampling_frequency sysfs attribute to cause a denial of service.
Affected software
Linux kernel
Ubuntu
linux-ibm (Ubuntu package)
linux-azure (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)
Ubuntu
linux-ibm (Ubuntu package)
linux-azure (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)
How to mitigate CVE-2026-63931
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15
linux-nvidia (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16
linux-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15
linux-nvidia (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16
External References
- https://git.kernel.org/stable/c/2c50c017df97bfb425038efdfb8514c7bcd08564
- https://git.kernel.org/stable/c/4748bce423a363bb8a85a624faeb8f54fe331611
- https://git.kernel.org/stable/c/5aba4f94b225617a55fed442a70329b2ee19c0a5
- https://git.kernel.org/stable/c/5e4d34092a5ebfbc3a45a180c76ecb1cdbbedd53
- https://git.kernel.org/stable/c/6308b812acdcac38cbfe1af0b1524c3375f408a5
- https://git.kernel.org/stable/c/c7a740bf75554b051fabb17596ca6e483d6e6d90
- https://git.kernel.org/stable/c/d98c2e69aab905d1b19a69ffe584efa46a9efd42
- https://git.kernel.org/stable/c/e85bc501947f5ae16dd9adc01162b76d55ab7962