CVE-2026-97963

Summary

In the Linux kernel, the following vulnerability has been resolved:

net: stmmac: initialize ptp_lock at probe time

priv->ptp_lock is only initialized in stmmac_ptp_register(), which runs during __stmmac_open(). However, the lock is also used while the interface is down and has never been opened: tc_taprio_configure() invokes the PTP gettime64() callback to compute the EST base time when offloading a TAPRIO schedule, and stmmac_get_time() takes priv->ptp_lock. Using an uninitialized rwlock is undefined behaviour. Move the rwlock_init() to __stmmac_dvr_probe(), together with the other private locks, so that ptp_lock is always valid regardless of the interface state.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxb60189e0392fa06348911077ef281eb2b1047b6a < 420315413b29635de1d4ea4142e410e6465260f3affected
LinuxLinuxb60189e0392fa06348911077ef281eb2b1047b6a < 25cc0096efba83b4e0e6fa50f03e9543b41e9d3daffected
LinuxLinuxb60189e0392fa06348911077ef281eb2b1047b6a < b1986595cf827c38ff929e22fbc9ca8f76379306affected
LinuxLinuxb60189e0392fa06348911077ef281eb2b1047b6a < 0338c68e22abd2ee509ec2e32508a50896618c32affected
LinuxLinux5.6affected
LinuxLinux0 < 5.6unaffected
LinuxLinux6.12.111 <= 6.12.*unaffected
LinuxLinux6.18.53 <= 6.18.*unaffected
LinuxLinux7.2.7 <= 7.2.*unaffected
LinuxLinux7.3-rc3 <= *unaffected

Weaknesses

References