CVE-2026-93146 time/namespace: Validate nanosecond field in proc_timens_set_offset()
A missing validation in the Linux kernel time namespace allows local attackers to cause incorrect calculations or unexpected behavior via invalid nanosecond values.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93146?
CVE-2026-93146 is a vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
time/namespace: Validate nanosecond field in proc_timens_set_offset()
The function validates tv_sec to be within [-KTIME_SEC_MAX, KTIME_SEC_MAX] but never validates that tv_nsec is within the valid range of [0, NSEC_PER_SEC-1] before using it in timespec64_add().
timespec64_add() expects both timespec64 structures to have normalized values with tv_nsec in the range [0, 999999999]. If off->val.tv_nsec contains invalid values (negative or >= NSEC_PER_SEC), it could lead to incorrect calculations or unexpected behavior.
Add validation to ensure tv_nsec is within the valid range before performing the addition.
Which versions are affected by CVE-2026-93146?
How do I fix CVE-2026-93146?
Apply the vendor's patch.
Is CVE-2026-93146 being exploited?
There is no known exploitation of CVE-2026-93146 in the wild and no public exploit code.
Sources
Also known as AZL-102281, BELL-CVE-2026-93146, DEBIAN-CVE-2026-93146, GHSA-477f-qmj2-58hm, UBUNTU-CVE-2026-93146.