{"id":"CVE-2026-89733","title":"usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()\n\nIn uvc_function_bind() error path, we use usb_ep_free_request which\nuses uvc->…","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-825"],"vendor":"Linux","product":"Linux","affected":["Linux >= 0f9df939385527049c8062a099fbfa1479fe7ce0 < ddb1b0d5d858584ed0d3a5aaa042ee693998c7e2","Linux >= 0f9df939385527049c8062a099fbfa1479fe7ce0 < 85dd5e8bd6776d02854f2847d83429f1f712e99c","Linux >= 0f9df939385527049c8062a099fbfa1479fe7ce0 < 502a7f5b79b7ba751988789e982924f8f496129f","Linux >= 0f9df939385527049c8062a099fbfa1479fe7ce0 < bec7708eb3b5295d12e931db24381b7c94c72953","Linux >= 0f9df939385527049c8062a099fbfa1479fe7ce0 < 8e88ed8a374de67270d38689f2a81018909cafbb","Linux >= 0f9df939385527049c8062a099fbfa1479fe7ce0 < 9897b7da8c0ad8356c1b8649379fcb5a689462cb","Linux >= 0f9df939385527049c8062a099fbfa1479fe7ce0 < 38f822ddce9355893d734279a26ddec45182197e","Linux >= 0f9df939385527049c8062a099fbfa1479fe7ce0 < bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc","Linux 1efa8a5aac93d9e67075995d7d4902b57ce184f7","Linux e7a4b0efe62e56a0acc81d16091c6efc2a282be8","Linux 065f5561a20659cf17aae5f72b32b5c2695c8e00","Linux >= 3.2.36 < 3.3","Linux >= 3.4.25 < 3.5","Linux >= 3.7.2 < 3.8","Linux 3.8"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:51:46.538Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89733","references":[{"url":"https://git.kernel.org/stable/c/ddb1b0d5d858584ed0d3a5aaa042ee693998c7e2"},{"url":"https://git.kernel.org/stable/c/85dd5e8bd6776d02854f2847d83429f1f712e99c"},{"url":"https://git.kernel.org/stable/c/502a7f5b79b7ba751988789e982924f8f496129f"},{"url":"https://git.kernel.org/stable/c/bec7708eb3b5295d12e931db24381b7c94c72953"},{"url":"https://git.kernel.org/stable/c/8e88ed8a374de67270d38689f2a81018909cafbb"},{"url":"https://git.kernel.org/stable/c/9897b7da8c0ad8356c1b8649379fcb5a689462cb"},{"url":"https://git.kernel.org/stable/c/38f822ddce9355893d734279a26ddec45182197e"},{"url":"https://git.kernel.org/stable/c/bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89733.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89733"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532203"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89733"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89733"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89733.mbox"}],"tags":["cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00169,"epssPercentile":0.06264,"scores":{"cna":7.8,"vendor":5.5},"ingestedAt":"2026-09-14T15:23:07.449Z","slug":"CVE-2026-89733","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()\n\nIn uvc_function_bind() error path, we use usb_ep_free_request which\nuses uvc->control_req but does not set it to NULL afterwards. Thus,\nuvc->control_req is a dangling pointer causing a UAF. Also we do not set\nthe uvc->control_buf pointer to NULL after freeing it, which is another\ndangling pointer. Fix it by setting uvc->control_req to NULL after we run\nusb_ep_free_request() and uvc->control_buf to NULL after kfree. Do the\nsame for uvc_function_unbind().\n\n## Affected\n\n- `Linux >= 0f9df939385527049c8062a099fbfa1479fe7ce0 < ddb1b0d5d858584ed0d3a5aaa042ee693998c7e2`\n- `Linux >= 0f9df939385527049c8062a099fbfa1479fe7ce0 < 85dd5e8bd6776d02854f2847d83429f1f712e99c`\n- `Linux >= 0f9df939385527049c8062a099fbfa1479fe7ce0 < 502a7f5b79b7ba751988789e982924f8f496129f`\n- `Linux >= 0f9df939385527049c8062a099fbfa1479fe7ce0 < bec7708eb3b5295d12e931db24381b7c94c72953`\n- `Linux >= 0f9df939385527049c8062a099fbfa1479fe7ce0 < 8e88ed8a374de67270d38689f2a81018909cafbb`\n- `Linux >= 0f9df939385527049c8062a099fbfa1479fe7ce0 < 9897b7da8c0ad8356c1b8649379fcb5a689462cb`\n- `Linux >= 0f9df939385527049c8062a099fbfa1479fe7ce0 < 38f822ddce9355893d734279a26ddec45182197e`\n- `Linux >= 0f9df939385527049c8062a099fbfa1479fe7ce0 < bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc`\n- `Linux 1efa8a5aac93d9e67075995d7d4902b57ce184f7`\n- `Linux e7a4b0efe62e56a0acc81d16091c6efc2a282be8`\n- `Linux 065f5561a20659cf17aae5f72b32b5c2695c8e00`\n- `Linux >= 3.2.36 < 3.3`\n- `Linux >= 3.4.25 < 3.5`\n- `Linux >= 3.7.2 < 3.8`\n- `Linux 3.8`\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 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89733.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224589,"id":"CVE-2026-89733","ts":1792401422404,"field":"cvss","old":"5.5","new":"7.8"},{"seq":224588,"id":"CVE-2026-89733","ts":1792401422404,"field":"severity","old":"medium","new":"high"},{"seq":208960,"id":"CVE-2026-89733","ts":1790062299787,"field":"cvss","old":"7.8","new":"5.5"},{"seq":208959,"id":"CVE-2026-89733","ts":1790062299787,"field":"severity","old":"high","new":"medium"},{"seq":197689,"id":"CVE-2026-89733","ts":1789384318418,"field":"cvss","old":"4.6","new":"7.8"},{"seq":197688,"id":"CVE-2026-89733","ts":1789384318418,"field":"severity","old":"medium","new":"high"},{"seq":183843,"id":"CVE-2026-89733","ts":1789356677638,"field":"cvss","old":"7.8","new":"4.6"},{"seq":183842,"id":"CVE-2026-89733","ts":1789356677638,"field":"severity","old":"high","new":"medium"},{"seq":153618,"id":"CVE-2026-89733","ts":1789285351525,"field":"cvss","old":null,"new":"7.8"},{"seq":153617,"id":"CVE-2026-89733","ts":1789285351525,"field":"severity","old":"none","new":"high"},{"seq":147542,"id":"CVE-2026-89733","ts":1789270211316,"field":"cvss","old":null,"new":"4.6"},{"seq":147541,"id":"CVE-2026-89733","ts":1789270211316,"field":"severity","old":"none","new":"medium"},{"seq":109300,"id":"CVE-2026-89733","ts":1789183731338,"field":"cvss","old":null,"new":"4.6"},{"seq":109299,"id":"CVE-2026-89733","ts":1789183731338,"field":"severity","old":"none","new":"medium"}]}