EUVD-2026-62236
GHSA-c9vm-fv4g-fr7v
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only attack via procfs (AV:L); race condition window requires precise timing (AC:H); unprivileged local user needed (PR:L); full root escalation constitutes a scope change (S:C).
Primary rating from Vendor (freebsd).
CVSS VectorVendor: freebsd
Lifecycle Timeline
4DescriptionCVE.org
During execve(2) of a SUID binary, the new virtual address space is installed before the process credentials are updated. During this window, a process running as the same user can access the target process's memory via procfs or linprocfs, because the kernel's debugging permission check still saw the original credentials.
An unprivileged local user can exploit this race to modify the address space of a SUID binary before its credentials are elevated, potentially gaining full control of the affected system.
AnalysisAI
Local privilege escalation in FreeBSD's execve(2) syscall allows an unprivileged local user to gain full root-level control by exploiting a TOCTOU race condition (CWE-367) in SUID binary execution. During the narrow window between virtual address space installation and credential elevation, the kernel's procfs permission check still evaluates the original (unprivileged) credentials, allowing a racing process to write to the target's memory via /proc/[pid]/mem or linprocfs. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must have an interactive local shell or code execution on the target FreeBSD host as an unprivileged user. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world exploitation risk is meaningfully lower than the provided CVSS 3.1 score of 8.8 implies, for two compounding reasons. … 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 fix is to apply the vendor-released patch corresponding to the affected release stream: upgrade to FreeBSD 15.0-RELEASE-p11 or later, FreeBSD 15.1-RELEASE-p1 or later, FreeBSD 14.3-RELEASE-p16 or later, or FreeBSD 14.4-RELEASE-p7 or later per the guidance in FreeBSD-SA-26:39.execve.asc (https://security.freebsd.org/advisories/FreeBSD-SA-26:39.execve.asc). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all FreeBSD 14.3, 14.4, 15.0, and 15.1 systems in production and assess local access exposure; immediately restrict local login access via SSH configuration (disable password authentication for non-administrative accounts, limit local shell access to essential personnel only) and enable audit logging for privilege escalation attempts and SUID binary execution. …
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