CVE-2026-74360

Summary

In the Linux kernel, the following vulnerability has been resolved:

bpf: Reject exclusive maps for bpf_map_elem iterators

Exclusive maps (aka excl_prog_hash) are meant to be reachable only from the single program whose hash matches. This is enforced by check_map_prog_compatibility() when the map is referenced from a program such as signed BPF loaders.

A bpf_map_elem iterator, however, binds its target map at attach time in bpf_iter_attach_map() instead of referencing it from the program, so the exclusivity check is never reached. On top of that, the iterator exposes the map value as a writable buffer.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/5cf2c85b1231218a3e3e9f188afb4fe2e17903d5
• https://git.kernel.org/stable/c/c3da741d5b2119c61c4498bc936f0fc1dbc3c79b
• https://git.kernel.org/stable/c/3c56ee343f9412d81918635c3e25e22a5dd6d87e

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