{"id":"CVE-2026-97963","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: initialize ptp_lock at probe time\n\npriv->ptp_lock is only initialized in stmmac_ptp_register(), which runs\nduring __stmmac_open()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: initialize ptp_lock at probe time\n\npriv->ptp_lock is only initialized in stmmac_ptp_register(), which runs\nduring __stmmac_open(). However, the lock is als…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= b60189e0392fa06348911077ef281eb2b1047b6a < 420315413b29635de1d4ea4142e410e6465260f3","Linux >= b60189e0392fa06348911077ef281eb2b1047b6a < 25cc0096efba83b4e0e6fa50f03e9543b41e9d3d","Linux >= b60189e0392fa06348911077ef281eb2b1047b6a < b1986595cf827c38ff929e22fbc9ca8f76379306","Linux >= b60189e0392fa06348911077ef281eb2b1047b6a < 0338c68e22abd2ee509ec2e32508a50896618c32","Linux 5.6"],"published":"2026-09-25","updated":"2026-09-25","sourceUpdated":"2026-09-25T11:17:24.080","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97963","references":[{"url":"https://git.kernel.org/stable/c/0338c68e22abd2ee509ec2e32508a50896618c32","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/25cc0096efba83b4e0e6fa50f03e9543b41e9d3d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/420315413b29635de1d4ea4142e410e6465260f3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b1986595cf827c38ff929e22fbc9ca8f76379306","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-25T11:06:38.874Z","slug":"CVE-2026-97963","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: initialize ptp_lock at probe time\n\npriv->ptp_lock is only initialized in stmmac_ptp_register(), which runs\nduring __stmmac_open(). However, the lock is also used while the\ninterface is down and has never been opened: tc_taprio_configure()\ninvokes the PTP gettime64() callback to compute the EST base time when\noffloading a TAPRIO schedule, and stmmac_get_time() takes\npriv->ptp_lock. Using an uninitialized rwlock is undefined behaviour.\nMove the rwlock_init() to __stmmac_dvr_probe(), together with the other\nprivate locks, so that ptp_lock is always valid regardless of the\ninterface state.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}