Critical severity9.8NVD Advisory· Published Aug 26, 2026· Updated Aug 27, 2026
CVE-2026-80586
CVE-2026-80586
Description
In the Linux kernel, the following vulnerability has been resolved:
mptcp: options: reset DSS fields in case of unexpected size
A remote peer could send a malformed DSS with a wrong size, followed by another DSS or MPC + Data. In this case, the first suboption will be ignored, but leaving some fields written, which could lead to inconsistency or access uninitialized data.
Explicitly reset the fields that could have been modified in case of unexpected size.
Affected products
2Patches
Vulnerability mechanics
References
8- git.kernel.org/stable/c/15e35fdad7a5576bf3f1c8d688877aeb5d1b506bnvd
- git.kernel.org/stable/c/192878df582c51d440bf7b91a15f297f29f2b596nvd
- git.kernel.org/stable/c/1fade1b2ac5b1a4948e538fae7313bea57b5ac36nvd
- git.kernel.org/stable/c/26dac5c9ffb20812b475fdf253eb04fab99cff3bnvd
- git.kernel.org/stable/c/27ed642a4e7e4b5df4b8522c72c457a67e052493nvd
- git.kernel.org/stable/c/35772b4981f38ba8059372cde8753e8e477e98ecnvd
- git.kernel.org/stable/c/4e80eff5c1c893aca2ac1d202f0b256d2e52ecdenvd
- git.kernel.org/stable/c/b1256090816ec46011601e084be580731df58fc7nvd
News mentions
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