CVE-2026-74344

CVE CVE-2026-74344EUVD EUVD-2026-59491Published 2026-08-15T05:58:33.000ZLast changed 2026-08-17T05:46:09.000ZCVSS 7.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: bpf: Clear rb node linkage when freeing bpf_rb_root bpf_rb_root_free() detaches the root by copying the current rb_root_cached and then replacing the live root with RB_ROOT_CACHED. It then walks the copied root and drops each object contained in the tree. This leaves the rb node state intact while dropping the object. If the object is refcounted and survives the drop, its bpf_rb_node_kern still contains an owner pointer to the freed root and stale rb tree linkage. If a later bpf_rb_root allocation reuses the same address, bpf_rbtree_remove() can incorrectly pass the owner check and call rb_erase_cached() on a node whose rb pointers belong to the old tree. Mirror the list draining behavior by marking nodes as busy while the root is being detached, then clear the rb node and release the owner before dropping the containing object. This makes surviving nodes unowned and safe to reject from remove or accept for a later add.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 6.2.15 <6.3; patch: 7.1.5; 1d0675957d35ac5e514073481beda62e4e1e2ec5; patch: 6.18.40; patch: 0; 6.3; 9c395c1b99bd23f74bc628fa000480c49593d17f <2eb39de4962f842d653e96818ae372665cd481fd; patch: 7.2; 9c395c1b99bd23f74bc628fa000480c49593d17f <574612793bed416f6c05fe7c9b50e9eb0441997e; 9c395c1b99bd23f74bc628fa000480c49593d17f <4a7910ee060d8ce55612f5b3cc267f3a265a3cec

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

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