Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.18, < 6.18.14 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/7752d36343862323bbeea4ce3adf0ec2ed86e122Patch
- https://git.kernel.org/stable/c/a2c86aa621c22f2a7e26c654f936d65cfff0aa91Patch
- https://git.kernel.org/stable/c/f415e114b58fe02c41191e47f24bdabb438daf72Patch
FAQ
What is CVE-2026-45927?
CVE-2026-45927 is a vulnerability with a CVSS score of 4.7 (MEDIUM). 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 regar...
How severe is CVE-2026-45927?
CVE-2026-45927 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-45927?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.