EUVD-2026-62229
GHSA-x3qv-w3hg-xgc7
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local device file access required (AV:L, PR:L); exploiting the constrained fictitious-page double-free for privilege escalation adds meaningful complexity (AC:H).
Primary rating from Vendor (freebsd).
CVSS VectorVendor: freebsd
Lifecycle Timeline
4DescriptionCVE.org
When msync(MS_INVALIDATE) is called on a mapping of an unmanaged device object, the physical pages in the mapping range are marked invalid but remain in the pager's page list. A subsequent page fault will cause the fault handler to re-insert the page into the object's list. This corrupts the list, and on object destruction the page is freed twice.
An unprivileged local user with access to a device that provides memory-mapped I/O can trigger a use-after-free in the kernel, though this is limited to a pool of objects ("fictitious pages") that are never recycled for a different purpose. It may be possible to exploit this to escalate privileges.
AnalysisAI
Use-after-free in the FreeBSD kernel virtual memory subsystem allows an unprivileged local user to corrupt the pager's page list by calling msync(MS_INVALIDATE) on a mapping of an unmanaged device object, then triggering a subsequent page fault. On object destruction, the affected page is freed twice, creating a kernel memory corruption primitive that may enable privilege escalation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attack requires a local, authenticated user account on an affected FreeBSD system (14.3-RELEASE < p16, 14.4-RELEASE < p7, 15.0-RELEASE < p11, or 15.1-RELEASE < p1) and unprivileged read/write access to a device file that provides memory-mapped I/O via an unmanaged device object in the FreeBSD VM subsystem. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS vector (AV:N/AC:L/PR:L) conflicts directly with the CVE description, which states the attack requires local access to a device providing memory-mapped I/O - this is a local, not network-reachable, attack vector. … 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 for all affected branches. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all FreeBSD systems in production and identify those running affected release branches listed in Security Advisory SA-26:37. …
Sign in for detailed remediation steps and compensating controls.
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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