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CVE-2026-43190 is an out-of-bounds read vulnerability in the Linux kernel's Netfilter xt_tcpmss TCP option parser. The parser reads op[i+1] without verifying that another byte remains within the TCP option field. When the final option byte is neither EOL nor NOP and i + 1 equals optlen, this accesses one byte beyond the option boundary, potentially beyond a stack buffer or into the following packet payload. A remote attacker can trigger the flaw with a specially crafted TCP packet on systems whose Netfilter rulesets use the tcpmss match. The vulnerability may cause information disclosure and potentially limited availability impact; it is not a generic TCP stack exposure.
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No public exploit code observed for this vulnerability.
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30 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel Netfilter xt_tcpmss vulnerability involving insufficient remaining-length checks before reading an option-length value. The advisory recommends updating affected Rocky Linux 10.2 kernel packages.
An out-of-bounds read vulnerability in the Linux kernel's netfilter xt_tcpmss TCP option parser. A missing remaining-length check can cause reads beyond the option buffer or into the following payload. The reference assigns a CVSS v3 base score of 8.2, reflecting potential confidentiality and availability impacts, although the vendor rates severity as low.
A vulnerability addressed by the referenced CentOS 7/TuxCare advisory; no technical flaw details are provided.
A vulnerability addressed in Huawei EulerOS UVP 2.10.1 kernel-related packages.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.