EUVD-2026-62243Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Local syscall interface requires user-level process execution (PR:L, AV:L); flag drop is unconditional so no special configuration needed (AC:L); deletion-only impact means no confidentiality loss (C:N).
Primary rating from Vendor (freebsd).
CVSS VectorVendor: freebsd
Lifecycle Timeline
4DescriptionCVE.org
The kernel function that implements unlinkat(2) and funlinkat(2) validated the AT_RESOLVE_BENEATH flag but failed to pass it through to the underlying path lookup. The flag was silently dropped, so path resolution was not actually restricted.
A process that uses AT_RESOLVE_BENEATH with unlinkat(2) or funlinkat(2) to confine path resolution can in fact resolve paths above the starting directory. A caller relying on this flag for path containment may delete files outside the intended directory tree.
AnalysisAI
Path containment bypass in FreeBSD's unlinkat(2) and funlinkat(2) syscalls allows a local low-privileged process to delete files outside its intended directory scope. The kernel validates AT_RESOLVE_BENEATH but silently discards it before handing off to the path resolution layer, making the flag a no-op security guarantee. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local process running with at least low-level user privileges (PR:L per CVSS). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H reflects a local, low-complexity attack requiring only user-level privilege - consistent with the nature of the syscall interface. … 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 | Apply the patched kernel from the official FreeBSD Security Advisory FreeBSD-SA-26:42.unlinkat.asc (https://security.freebsd.org/advisories/FreeBSD-SA-26:42.unlinkat.asc). … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-273 – Improper Check for Dropped Privileges
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External POC / Exploit Code
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