EUVD-2026-67551
GHSA-82gv-94cv-gr24
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
TOCTOU race window and mandatory hostile-host non-exclusive map precondition justify AC:H over the official AC:L; PR:L reflects minimum BPF loading privilege; no availability impact applies.
Primary rating from Vendor (Linux).
CVSS VectorVendor: Linux
Lifecycle Timeline
5DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
libbpf: Reject non-exclusive metadata maps in the signed loader
The loader verifies map->sha against the metadata hash in its instructions. map->sha is calculated when BPF_OBJ_GET_INFO_BY_FD is called on the frozen map.
While the map is frozen, the /signed loader/ must also ensure the map is exclusive, as, without exclusivity (which a hostile host could just omit when loading the loader), another BPF program with map access can mutate the contents afterwards, so the check passes on stale data.
With the extra check as part of the signed loader, it now refuses to move on with map->sha validation if the host set it up wrongly.
AnalysisAI
The BPF signed loader in the Linux kernel fails to enforce map exclusivity before performing SHA-based integrity validation of metadata maps, allowing a local attacker with BPF privileges to race a mutation of the shared map's contents after the hash is computed but before validation completes. Systems running Linux kernel between commit fb2b0e290147ba01a53dfd92cf91058c9d2ee254 and the patched stable releases (6.18.40, 7.1.5, 7.2) are affected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) Local authenticated access with sufficient privilege to load BPF programs - specifically CAP_BPF or CAP_SYS_ADMIN, or kernel.unprivileged_bpf_disabled=0 for unprivileged BPF loading (CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD CVSS 3.1 score of 7.1 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N) rates this as High severity, but several signals temper real-world urgency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to a patched Linux kernel version: 6.18.40, 7.1.5, or 7.2, whichever applies to your stable series, applying the relevant upstream commits from the kernel stable tree (https://git.kernel.org/stable/c/b6862b6a25c6a925fb0b0e549ee4a52a8d2966fb, https://git.kernel.org/stable/c/0fb6c9ed6493b4af01be8bb0a384574eba7df636, https://git.kernel.org/stable/c/0dad5adeb34b6f78a883e8faa6a1c947a240e7c9). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory systems running Linux kernel versions 6.18.0-6.18.39, 7.1.0-7.1.4, or versions before 7.2. …
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External POC / Exploit Code
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