EUVD-2026-62340
GHSA-5q67-rff6-c784
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Network vector retained as jail access is plausible via SSH; A:L rather than A:H because impact is limited to disabling tracing within one jail, not broader system availability.
Primary rating from Vendor (freebsd).
CVSS VectorVendor: freebsd
Lifecycle Timeline
4DescriptionCVE.org
As an inadvertent side effect of an unrelated code change, PRIV_KTRACE was always denied to a jailed root user. Tracing configured by a jailed root user was therefore not flagged as privileged.
An unprivileged user in a jail that has permission to debug the target process can modify the jailed root user's ktrace(2) flags, or disable tracing outright. A jailed root user therefore cannot reliably trace unprivileged processes.
AnalysisAI
Privilege management regression in FreeBSD 15.x ktrace(2) allows an unprivileged jail user to manipulate or suppress the jailed root user's kernel tracing configuration. Because an unrelated code change inadvertently causes PRIV_KTRACE to always be denied to jailed root, that user's active trace sessions are not marked as privileged - permitting any jail user holding debug rights over a traced process to alter or clear those trace flags. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires all of the following specific conditions: the attacker must be an existing user account inside a FreeBSD jail (not on the bare host or a different jail); the attacker must have been granted permission to debug the specific target process (e.g., via ptrace, a non-default privilege typically granted explicitly by jail or host administrator); the target host must be running FreeBSD 15.0-RELEASE before p12 or FreeBSD 15.1-RELEASE before p2; and jailed root must have an active ktrace session on that process. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD-assigned CVSS 3.1 score of 8.1 with AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H likely overstates practical severity because A:H is difficult to justify when the impact is confined to disabling tracing within a single jail rather than degrading the host system. … 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 FreeBSD Project has released corrective patches: systems running FreeBSD 15.0-RELEASE should update to patch level 12 or later, and systems running FreeBSD 15.1-RELEASE should update to patch level 2 or later, as documented in FreeBSD-SA-26:53.ktrace.asc at https://security.freebsd.org/advisories/FreeBSD-SA-26:53.ktrace.asc. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all FreeBSD 15.x systems running multi-tenant jail configurations and confirm whether kernel-level audit logging is currently in use. …
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Same weakness CWE-273 – Improper Check for Dropped Privileges
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External POC / Exploit Code
Leaving vuln.today