EUVD-2026-62254Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Description explicitly requires unprivileged local user (AV:L/PR:L); privilege escalation to kernel constitutes a scope change (S:C); all impact metrics High.
Primary rating from Vendor (freebsd).
CVSS VectorVendor: freebsd
Lifecycle Timeline
4DescriptionCVE.org
Pages belonging to largepage shared memory objects were not explicitly wired. When sendfile(2) transmitted such an object with the SF_NOCACHE flag, it freed the underlying pages after transmission even though existing mappings still referred to them.
An unprivileged local user can abuse the bug to access freed kernel memory. This can be exploited to escalate privileges.
AnalysisAI
Privilege escalation in the FreeBSD kernel's POSIX shared memory subsystem allows an unprivileged local user to access freed kernel memory and escalate privileges. The flaw arises in the interaction between largepage-backed shared memory objects and the sendfile(2) syscall when used with the SF_NOCACHE flag, which prematurely frees pages that active memory mappings still reference, producing a use-after-free condition in kernel address space. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local, authenticated (low-privilege) session on a vulnerable FreeBSD system - the attacker must be able to execute arbitrary code as an unprivileged user. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD-assigned CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N) scores 8.8 (High), but the attack vector AV:N is inconsistent with the description's explicit statement that exploitation requires an unprivileged local user - a discrepancy that inflates the apparent network-reachability of the flaw. … 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 | The primary remediation is to apply the vendor-released patch levels: upgrade to FreeBSD 15.1-RELEASE-p1, 15.0-RELEASE-p11, 14.4-RELEASE-p7, or 14.3-RELEASE-p16, as documented in FreeBSD-SA-26:44.posixshm.asc (https://security.freebsd.org/advisories/FreeBSD-SA-26:44.posixshm.asc). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all FreeBSD 14.3, 14.4, 15.0, and 15.1 systems and identify which allow local user access or run untrusted processes. …
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External POC / Exploit Code
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