CVE-2026-43190

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).

CVSS 3.1

8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

EPSS

0.5% chance of exploitation in the next 30 days; higher than 39% of CVEs (scores of 2026-10-25)

CWE

CWE-125

Published

2026-05-06

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

Affected

• linux:linux_kernel

References

• 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

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