Use of Uninitialized Variable in Linux kernel - CVE-2026-99088
Published: October 26, 2026
Vulnerability identifier: #VU157701
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-99088
CWE-ID: CWE-457
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to trigger a harmless kernel debug warning.
The vulnerability exists due to use of an uninitialized transport-header offset in the Linux kernel Open vSwitch update_ipv6_checksum() function when rewriting IPv6 addresses in non-first IPv6 fragments. A local user can submit a non-first IPv6 fragment for address rewriting to trigger the warning.
The warning occurs with CONFIG_DEBUG_NET=y.
Affected software
Linux kernel
How to mitigate CVE-2026-99088
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/2594795fd832f0253826d64ff8976b8ff5fbfe9f
- https://git.kernel.org/stable/c/3c6a4b11330fe424557538a98fca9f0a4c5bf313
- https://git.kernel.org/stable/c/6774af7cd17be8f0d0f70de3a749d381b4f2e9da
- https://git.kernel.org/stable/c/6b8897ba0733f88f0360ea48a970f373f9142de0
- https://git.kernel.org/stable/c/b7b80d204abdc258006f9e17c92b363ab13bb599