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CVE-2026-46086 is a time-of-check/time-of-use race condition in the Linux kernel bridge networking subsystem. The fdb_delete_local() function can rewrite a live local forwarding database entry's destination pointer, f->dst, to another port or NULL. Affected RCU readers load this pointer multiple times, allowing inconsistent values between validation and use. In br_fdb_fillbuf(), reachable through the brforward_read() sysfs interface, a concurrent update can replace the pointer with NULL after its NULL check but before the port_no dereference. This can cause a kernel NULL-pointer dereference and system crash. The vulnerability was introduced in Linux kernel 3.14.
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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.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A locally exploitable Unity Linux/UOS Server vulnerability affecting availability, with low attack complexity and low privileges required according to the provided CVSS v3 vector.
A vulnerability tracked as CVE-2026-46086 referenced in a Unity Linux local security check advisory.
A Linux kernel bridge networking flaw caused by inconsistent handling of local FDB entries in RCU readers, leading to a null-pointer dereference and local denial of service via kernel crash.
A Linux kernel vulnerability in the networking bridge code related to using a stable FDB destination snapshot in RCU readers.
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.