{"id":"CVE-2026-80954","title":"i3c: Fix unlocked dereference of dev->desc in i3c_device_get_supported_xfer_mode()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ni3c: Fix unlocked dereference of dev->desc in i3c_device_get_supported_xfer_mode()\n\ni3c_device_get_supported_xfer_mode() uses dev->desc to obtain the\nmaster controller.…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-476"],"vendor":"Linux","product":"Linux","affected":["Linux >= 256a21743d911f94ce92fe28f793cd586f3860b2 < 251db58324ea4792c3f9f692ab09be148e051969","Linux >= 256a21743d911f94ce92fe28f793cd586f3860b2 < 8bed7f4fa710914b7f05fd59998316bfb4d43385","Linux 6.19"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:45:38.169Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80954","references":[{"url":"https://git.kernel.org/stable/c/251db58324ea4792c3f9f692ab09be148e051969"},{"url":"https://git.kernel.org/stable/c/8bed7f4fa710914b7f05fd59998316bfb4d43385"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80954.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80954"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532524"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80954"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80954"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80954.mbox"}],"tags":["cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00165,"epssPercentile":0.05681,"scores":{"cna":7.8,"vendor":5.5},"ingestedAt":"2026-09-14T15:23:07.476Z","slug":"CVE-2026-80954","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ni3c: Fix unlocked dereference of dev->desc in i3c_device_get_supported_xfer_mode()\n\ni3c_device_get_supported_xfer_mode() uses dev->desc to obtain the\nmaster controller.  However, dev->desc must not be dereferenced unless\nbus->lock is held, and this function does not take that lock.\n\nThe function only needs access to the master controller associated with\nthe device's bus.  Use dev->bus instead, which is always valid for the\nlifetime of the device and does not require dereferencing dev->desc.\n\n## Affected\n\n- `Linux >= 256a21743d911f94ce92fe28f793cd586f3860b2 < 251db58324ea4792c3f9f692ab09be148e051969`\n- `Linux >= 256a21743d911f94ce92fe28f793cd586f3860b2 < 8bed7f4fa710914b7f05fd59998316bfb4d43385`\n- `Linux 6.19`\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** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80954.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224812,"id":"CVE-2026-80954","ts":1792401557447,"field":"cvss","old":"5.5","new":"7.8"},{"seq":224811,"id":"CVE-2026-80954","ts":1792401557447,"field":"severity","old":"medium","new":"high"},{"seq":204237,"id":"CVE-2026-80954","ts":1789490240464,"field":"cvss","old":"4.4","new":"5.5"},{"seq":202941,"id":"CVE-2026-80954","ts":1789403733040,"field":"cvss","old":"7.8","new":"4.4"},{"seq":202940,"id":"CVE-2026-80954","ts":1789403733040,"field":"severity","old":"high","new":"medium"},{"seq":183616,"id":"CVE-2026-80954","ts":1789356676117,"field":"cvss","old":"7.8","new":"4.4"},{"seq":183615,"id":"CVE-2026-80954","ts":1789356676117,"field":"severity","old":"high","new":"medium"},{"seq":153138,"id":"CVE-2026-80954","ts":1789285349199,"field":"cvss","old":null,"new":"7.8"},{"seq":153137,"id":"CVE-2026-80954","ts":1789285349199,"field":"severity","old":"none","new":"high"},{"seq":147069,"id":"CVE-2026-80954","ts":1789270195037,"field":"cvss","old":null,"new":"4.4"},{"seq":147068,"id":"CVE-2026-80954","ts":1789270195037,"field":"severity","old":"none","new":"medium"}]}