CVE-2026-43190
Description
AI Translation Available
In the Linux kernel, the following vulnerability has been resolved:
netfilter: xt_tcpmss: check remaining length before reading optlen
Quoting reporter:
In net/netfilter/xt_tcpmss.c (lines 53-68), the TCP option parser reads
op[i+1] directly without validating the remaining option length.
If the last byte of the option field is not EOL/NOP (0/1), the code attempts
to index op[i+1]. In the case where i + 1 == optlen, this causes an
out-of-bounds read, accessing memory past the optlen boundary
(either reading beyond the stack buffer _opt or the
following payload).
https://git.kernel.org/stable/c/07a9b32eaae792ff7d0fcac14d8920c937c0a9c3
https://git.kernel.org/stable/c/5e13d0a37666955b6cfddc0f73cb40ed645b8a05
https://git.kernel.org/stable/c/735ee8582da3d239eb0c7a53adca61b79fb228b3
https://git.kernel.org/stable/c/8b300f726640c48c3edfe9c453334dd801f4b74e
https://git.kernel.org/stable/c/cd5beda7e0e32865e214f28034bb92c1cecff885
https://git.kernel.org/stable/c/eaedc0bc18be46fe7f58170e967959a932c4f824
https://git.kernel.org/stable/c/f6c412dcfd76b0516d51aa847d8f4c7b70381b09
https://git.kernel.org/stable/c/f895191dc32c53eaf443b6443fe40945b2f92287