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.
References
Configurations
Configuration 1 (hide)
|
History
25 Jun 2026, 12:42
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 4.7 |
| CWE | CWE-367 | |
| First Time |
Linux linux Kernel
Linux |
|
| References | () https://git.kernel.org/stable/c/7752d36343862323bbeea4ce3adf0ec2ed86e122 - Patch | |
| References | () https://git.kernel.org/stable/c/a2c86aa621c22f2a7e26c654f936d65cfff0aa91 - Patch | |
| References | () https://git.kernel.org/stable/c/f415e114b58fe02c41191e47f24bdabb438daf72 - Patch | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
27 May 2026, 14:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-27 14:17
Updated : 2026-06-25 12:42
NVD link : CVE-2026-45927
Mitre link : CVE-2026-45927
CVE.ORG link : CVE-2026-45927
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-367
Time-of-check Time-of-use (TOCTOU) Race Condition