CVE-2026-74364

CVE CVE-2026-74364EUVD EUVD-2026-59511Published 2026-08-15T05:58:46.000ZLast changed 2026-08-17T05:46:23.000ZCVSS 7.1

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: bpf: Reject exclusive maps as inner maps in map-in-map An exclusive map (created with excl_prog_hash) is bound to a single program by hash: check_map_prog_compatibility() refuses to load any program whose digest does not match map->excl_prog_sha. That check only runs for maps a program references directly, i.e. its used_maps. A map reached at runtime through a map-of-maps is never in used_maps, and bpf_map_meta_equal() does not consider excl_prog_sha, so an exclusive map can be inserted into a non-exclusive outer map and then looked up and mutated by an unrelated program, bypassing the exclusivity guarantee. For the signed loader this defeats the metadata map exclusivity check added in the signed loader: the cached map->sha[] is validated against the signed hash while another program on a hostile host rewrites the frozen map's contents through the outer map.

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 baefdbdf6812e120c9fba9cfb101d3656f478026 <3a0f73d27a8d379a8852a378b3c3208143e3b3b2; patch: 6.18.40; baefdbdf6812e120c9fba9cfb101d3656f478026 <7c58ace08f180f8e249e714d1623388362f9d807; patch: 0; baefdbdf6812e120c9fba9cfb101d3656f478026 <9a3c3c49c333760c8944dadacbe114c1884546ef; patch: 7.1.5; patch: 7.2; 6.18

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

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Linux — Linux

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