CVE-2026-74364bpf: Reject exclusive maps as inner maps in map-in-map
Updated under an hour ago ()
Does this affect you?
It affects Linux. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- CVSS
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from baefdbdf6812e120c9fba9cfb101d3656f478026 before 3a0f73d27a8d379a8852a378b3c3208143e3b3b2; from baefdbdf6812e120c9fba9cfb101d3656f478026 before 7c58ace08f180f8e249e714d1623388362f9d807; from baefdbdf6812e120c9fba9cfb101d3656f478026 before 9a3c3c49c333760c8944dadacbe114c1884546ef | CNA record |
References
- https://git.kernel.org/stable/c/3a0f73d27a8d379a8852a378b3c3208143e3b3b2
- https://git.kernel.org/stable/c/7c58ace08f180f8e249e714d1623388362f9d807
- https://git.kernel.org/stable/c/9a3c3c49c333760c8944dadacbe114c1884546ef
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.