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CVE-2026-46158 is a Linux kernel vulnerability in the Multipath TCP (mptcp) path manager's ADD_ADDR retransmission handling. During ADD_ADDR retransmission, the socket reference is held in sk_reset_timer() and is expected to be released at the end of processing. However, certain unlikely error-check paths returned directly instead of reaching the cleanup path that decrements the socket reference count via sock_put()/__sock_put(). This results in a potential socket reference count leak in the kernel. The upstream fix changes control flow so all paths jump to a common exit label that always releases the socket reference.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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.