CVE-2026-45927
- Source
- https://cve.org/CVERecord?id=CVE-2026-45927
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45927.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-45927
- Downstream
- Published
- 2026-05-27T12:17:46.284Z
- Modified
- 2026-07-15T01:49:06.811572371Z
- Summary
- bpf: Require frozen map for calculating map hash
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
bpf: Require frozen map for calculating map hash
Currently, bpfmapgetinfoby_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 BPFOBJGETINFOBY_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.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45927.json" }- References
-
- https://git.kernel.org/stable/c/7752d36343862323bbeea4ce3adf0ec2ed86e122
- https://git.kernel.org/stable/c/a2c86aa621c22f2a7e26c654f936d65cfff0aa91
- https://git.kernel.org/stable/c/f415e114b58fe02c41191e47f24bdabb438daf72
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45927.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-45927
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git