EUVD-2026-62255
GHSA-7m85-fgv2-gv39
Severity by source
AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Local access requires a user account, mapping to PR:L; vendor's PR:N overstates exposure since shell access is an explicit prerequisite.
Primary rating from Vendor (freebsd).
CVSS VectorVendor: freebsd
Lifecycle Timeline
3DescriptionCVE.org
Certain system calls, such open(2) with the O_TRUNC flag set, and fspacectl(2), could incorrectly free memory in largepage objects. These operations are not permitted on largepage objects, but the implementation did not verify this.
An unprivileged local user can abuse the bug to access freed kernel memory. This can be exploited to escalate privileges.
AnalysisAI
Privilege escalation in FreeBSD's POSIX shared memory subsystem allows any unprivileged local user to free kernel memory that remains in active use, then access that freed memory to overwrite kernel data structures and gain root privileges. The flaw spans four active FreeBSD release branches (14.3, 14.4, 15.0, 15.1) and is triggered by two standard system calls - open(2) with O_TRUNC and fspacectl(2) - when applied to largepage-backed shared memory objects. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local, unprivileged shell account on a FreeBSD system running one of the affected release levels (14.3-RELEASE before p16, 14.4-RELEASE before p7, 15.0-RELEASE before p11, or 15.1-RELEASE before p1). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS base score of 8.4 with a full C:H/I:H/A:H impact triad correctly characterises the severity of a successful exploit - kernel-level privilege escalation is catastrophic by definition. … 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 FreeBSD release: 14.3-RELEASE-p16, 14.4-RELEASE-p7, 15.0-RELEASE-p11, or 15.1-RELEASE-p1, as detailed in FreeBSD Security Advisory FreeBSD-SA-26:44.posixshm at https://security.freebsd.org/advisories/FreeBSD-SA-26:44.posixshm.asc. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Identify all systems running FreeBSD 14.3, 14.4, 15.0, or 15.1 within 24 hours. …
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Same technique Privilege Escalation
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External POC / Exploit Code
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