CVE-2026-90056 net: fec: only stop PTP if it was initialized
A null pointer dereference in the Linux kernel FEC driver can cause a system crash during device removal or initialization failure.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-90056?
CVE-2026-90056 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:
net: fec: only stop PTP if it was initialized
fec_ptp_init() is only called when fep->bufdesc_ex is available. However, fec_probe() unconditionally calls fec_ptp_stop() on the failed_init path, and fec_drv_remove() unconditionally calls fec_ptp_stop() during device removal.
Check fep->bufdesc_ex before calling fec_ptp_stop() in both paths to avoid stopping PTP when it was not initialized.
Which versions are affected by CVE-2026-90056?
How do I fix CVE-2026-90056?
Apply the vendor's patch.
Is CVE-2026-90056 being exploited?
There is no known exploitation of CVE-2026-90056 in the wild and no public exploit code.
Sources
Also known as AZL-102948, BELL-CVE-2026-90056, DEBIAN-CVE-2026-90056, GHSA-gqc9-g66v-x8p5, UBUNTU-CVE-2026-90056.