EUVD-2026-66234Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local PMC monitoring of setuid processes yields high confidentiality impact via side-channel leakage; no direct integrity modification or availability disruption is described.
Primary rating from Vendor (freebsd).
CVSS VectorVendor: freebsd
Lifecycle Timeline
4DescriptionCVE.org
When a process calls execve(2) to execute a setuid or setgid image, hwpmc(4) is supposed to detach PMCs owned by unprivileged processes. An inverted check meant that this scenario was not handled properly.
An unprivileged local user who has attached PMCs to a process can continue monitoring it after the process executes a setuid or setgid binary, contrary to the intended policy.
AnalysisAI
Privilege boundary violation in FreeBSD's hwpmc(4) hardware performance monitoring subsystem allows a low-privileged local user to continue observing a process via attached PMCs after that process elevates privileges by executing a setuid or setgid binary, directly contrary to the kernel's intended security policy. Affected versions span FreeBSD 14.4-RELEASE before p9, 15.0-RELEASE before p13, and 15.1-RELEASE before p3; vendor patches are available per FreeBSD Security Advisory SA-26:56. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local unprivileged user account on the affected FreeBSD system with the ability to invoke hwpmc(4) PMC attachment interfaces (via pmcstat(8) or direct system calls). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H yields a score of 7.8, but the I:H and A:H ratings warrant scrutiny: the described impact is continued PMC monitoring of a setuid process, which maps cleanly to C:H (side-channel leakage of sensitive data from a privileged context) but does not describe a mechanism for direct integrity modification or availability disruption. … 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 | Vendor-released patches are available: upgrade to FreeBSD 14.4-RELEASE-p9, FreeBSD 15.0-RELEASE-p13, or FreeBSD 15.1-RELEASE-p3 as appropriate for the installed release, following the instructions in FreeBSD Security Advisory SA-26:56 at https://security.freebsd.org/advisories/FreeBSD-SA-26:56.hwpmc.asc. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify FreeBSD systems running affected versions (14.4-RELEASE before p9, 15.0-RELEASE before p13, or 15.1-RELEASE before p3). …
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External POC / Exploit Code
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