CVE-2026-45927
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Require frozen map for calculating map hash Currently, bpf_map_get_info_by_fd calculates and caches the hash of the map regardless of the map's frozen state. This leads to a TOCTOU bug where userspace can call BPF_OBJ_GET_INFO_BY_FD to cache the hash and then modify the map contents before freezing. Therefore, a trusted loader can be tricked into verifying the stale hash while loading the modified contents. Fix this by returning -EPERM if the map is not frozen when the hash is requested. This ensures the hash is only generated for the final, immutable state of the map.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | fixed | 0 |
| debian | bullseye | fixed | 0 |
| debian | forky | fixed | 6.18.14-1 |
| debian | sid | fixed | 6.18.14-1 |
| debian | trixie | fixed | 0 |
| sles | affected | |
References
- https://git.kernel.org/stable/c/7752d36343862323bbeea4ce3adf0ec2ed86e122
- https://git.kernel.org/stable/c/f415e114b58fe02c41191e47f24bdabb438daf72
- https://git.kernel.org/stable/c/a2c86aa621c22f2a7e26c654f936d65cfff0aa91
- https://security-tracker.debian.org/tracker/CVE-2026-45927
- https://www.suse.com/security/cve/CVE-2026-45927.html
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.