Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ea2e6467ac36bf3d785defc89e58269b15d182f7 before 7752d36343862323bbeea4ce3adf0ec2ed86e122; affected ea2e6467ac36bf3d785defc89e58269b15d182f7 before f415e114b58fe02c41191e47f24bdabb438daf72; affected ea2e6467ac36bf3d785defc89e58269b15d182f7 before a2c86aa621c22f2a7e26c654f936d65cfff0aa91 |
| Linux / Linux | affected 6.18; unaffected 0 before 6.18; unaffected 6.18.14 through 6.18.*; unaffected 6.19.4 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.