CVE-2026-43190High· 8.2▾ TwilightIn 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]…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 45.1 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.5%
Last analysed / modified upstream
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).
Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f895191dc32c53eaf443b6443fe40945b2f92287Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cd5beda7e0e32865e214f28034bb92c1cecff885Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < eaedc0bc18be46fe7f58170e967959a932c4f824Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 07a9b32eaae792ff7d0fcac14d8920c937c0a9c3Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8b300f726640c48c3edfe9c453334dd801f4b74eLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5e13d0a37666955b6cfddc0f73cb40ed645b8a05Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f6c412dcfd76b0516d51aa847d8f4c7b70381b09Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 735ee8582da3d239eb0c7a53adca61b79fb228b3Linux 2.6.12Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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