{"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":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-908"],"vendor":"Linux","product":"Linux","affected":["Linux >= b60189e0392fa06348911077ef281eb2b1047b6a < ee33e424d4932c70f103b94a46b685923f236f65","Linux >= b60189e0392fa06348911077ef281eb2b1047b6a < 7ced87834f3a58761d4bbcabf8326478548e6a54","Linux >= b60189e0392fa06348911077ef281eb2b1047b6a < 79fb5bcc50996964e076dffbdc24b7d2c06bd957","Linux >= b60189e0392fa06348911077ef281eb2b1047b6a < 420315413b29635de1d4ea4142e410e6465260f3","Linux >= b60189e0392fa06348911077ef281eb2b1047b6a < 25cc0096efba83b4e0e6fa50f03e9543b41e9d3d","Linux >= b60189e0392fa06348911077ef281eb2b1047b6a < b1986595cf827c38ff929e22fbc9ca8f76379306","Linux >= b60189e0392fa06348911077ef281eb2b1047b6a < 0338c68e22abd2ee509ec2e32508a50896618c32","Linux 5.6"],"published":"2026-09-25","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:18:21.260","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/79fb5bcc50996964e076dffbdc24b7d2c06bd957","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7ced87834f3a58761d4bbcabf8326478548e6a54","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b1986595cf827c38ff929e22fbc9ca8f76379306","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ee33e424d4932c70f103b94a46b685923f236f65","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97963.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-97963"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541153"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97963"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97963"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97963.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00173,"epssPercentile":0.06628,"cvssSource":"vendor","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.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97963.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":213377,"id":"CVE-2026-97963","ts":1790754701524,"field":"cvss","old":null,"new":"5.5"},{"seq":213376,"id":"CVE-2026-97963","ts":1790754701524,"field":"severity","old":"none","new":"medium"}]}