{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89741", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.761Z", "datePublished": "2026-09-11T19:46:47.877Z", "dateUpdated": "2026-10-19T08:51:55.196Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:51:55.196Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"media: v4l2-dev: fix error handling in __video_register_device()\"\n\nThis reverts commit 2a934fdb01db6458288fc9386d3d8ceba6dd551a.\n\nThe intentions of that patch were good, but it doesn't work.\n\nThe idea is that if device_register fails, you have to do a put_device\nto let the ref counter release resources.\n\nHowever, the V4L2 API says that if video_register_device() fails, then\nyou have to call video_device_release(), which kfree()s the video_device\nstruct.\n\nBut the put_device() will already have freed the struct, so you end\nup in a double-free scenario.\n\nThere is not really a good way of fixing this without breaking\nvideo_register_device() into two parts, one that initializes everything,\nand one that does the actual device_register, and then converting all\nV4L2 drivers to this new model.\n\nThat is a massive job, and it is very unlikely that device_register\nwill fail.\n\nSo rather than ending up in a double-free scenario, just revert this\npatch, and in that case we'll have a small memory leak. Which is a lot\nmore robust." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The double-free is in __video_register_device(), reached from local V4L2 registration such as USB gadget UVC configfs UDC bind (uvc_function_bind → uvc_register_video) and usbfs/sysfs re-probe of USB cameras; dummy_hcd suffices and there is no remote packet path.\nAC:L - A local attacker can retry gadget bind or device re-probe under memory/resource pressure to make device_register() fail and take the put_device() error path; success does not depend on a victim-owned race or uninfluenced layout.\nPR:L - __video_register_device() and uvc_function_bind() perform no capable() check; Android/embedded HALs routinely delegate usb_gadget configfs to non-root, and desktop usbfs/video nodes are typically uaccess/video-group, so init-namespace root is not required.\nUI:N - The attacker performs the configfs UDC bind or local re-probe and applies resource pressure themselves; no separate victim mount, file-open, or cable-plug action is required.\nS:U - The heap double-free corrupts a kmalloc'd video_device or the parent object freed by vdev->release() inside the same host kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - On device_register() failure the buggy put_device() runs v4l2_device_release() which calls vdev->release()/kfree, then callers such as video_device_release() or gspca/uvc probe error paths free the same object again, yielding a UAF disclosure primitive.\nI:H - The same double-free of struct video_device (or parent driver objects via vdev->release, as in UVC kref_put/uvc_delete and gspca_release) is heap corruption that can be sprayed into an arbitrary write and control-flow hijack.\nA:H - The double-free and premature v4l2_device_release() (including media_devnode_remove() on a still-NULL intf_devnode) oops or panic the kernel, and the attacker can repeat failed registration to force the crash." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/media/v4l2-core/v4l2-dev.c" ], "versions": [ { "version": "e5c8e62ae551e0ad2e15412aa0c57c2856d59677", "lessThan": "8b998c171ed875e402e1fd1c5cd619e4ca05e9c1", "status": "affected", "versionType": "git" }, { "version": "8b451a9a46f2bfc510e6d5c2492df91647586184", "lessThan": "3de14b4f681a1b3c6d375d98d9d37a55ebb85349", "status": "affected", "versionType": "git" }, { "version": "b6be1f5633eae200af2527e9eeb7f51be5739b0f", "lessThan": "8027f82c0f5474ed72448e160ee9778051fa1f49", "status": "affected", "versionType": "git" }, { "version": "ae7b143e05b36fc69d6571751855946cc45064c6", "lessThan": "2ac009a65d2385e9f0799eaf9d9694a29153a161", "status": "affected", "versionType": "git" }, { "version": "2429bb9fad88c8fa84c4956b0a21cf5afe5e92b7", "lessThan": "712ca1cf756de2557a116e0df55791bac0c9f99e", "status": "affected", "versionType": "git" }, { "version": "2a934fdb01db6458288fc9386d3d8ceba6dd551a", "lessThan": "aad08b5f67d2a8116e1a00bce2611c1513b10bce", "status": "affected", "versionType": "git" }, { "version": "2a934fdb01db6458288fc9386d3d8ceba6dd551a", "lessThan": "ce792b94e03882108019ba996c1a7c4d4e09be2c", "status": "affected", "versionType": "git" }, { "version": "2a934fdb01db6458288fc9386d3d8ceba6dd551a", "lessThan": "e7600f5cee5de14065f950807931d6e6d40fb2d7", "status": "affected", "versionType": "git" }, { "version": "ee141706e701356dda41c6fed9ee18bf427c28e3", "status": "affected", "versionType": "git" }, { "version": "4451412739ed33a49b34624299394ee575116d0c", "status": "affected", "versionType": "git" }, { "version": "5.10.239", "lessThan": "5.10.270", "status": "affected", "versionType": "semver" }, { "version": "5.15.186", "lessThan": "5.15.221", "status": "affected", "versionType": "semver" }, { "version": "6.1.142", "lessThan": "6.1.188", "status": "affected", "versionType": "semver" }, { "version": "6.6.95", "lessThan": "6.6.157", "status": "affected", "versionType": "semver" }, { "version": "6.12.35", "lessThan": "6.12.109", "status": "affected", "versionType": "semver" }, { "version": "5.4.295", "lessThan": "5.5", "status": "affected", "versionType": "semver" }, { "version": "6.15.4", "lessThan": "6.16", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/media/v4l2-core/v4l2-dev.c" ], "versions": [ { "version": "6.16", "status": "affected" }, { "version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.239", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.186", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.142", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.95", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.35", "versionEndExcluding": "6.12.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.295" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15.4" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/8b998c171ed875e402e1fd1c5cd619e4ca05e9c1" }, { "url": "https://git.kernel.org/stable/c/3de14b4f681a1b3c6d375d98d9d37a55ebb85349" }, { "url": "https://git.kernel.org/stable/c/8027f82c0f5474ed72448e160ee9778051fa1f49" }, { "url": "https://git.kernel.org/stable/c/2ac009a65d2385e9f0799eaf9d9694a29153a161" }, { "url": "https://git.kernel.org/stable/c/712ca1cf756de2557a116e0df55791bac0c9f99e" }, { "url": "https://git.kernel.org/stable/c/aad08b5f67d2a8116e1a00bce2611c1513b10bce" }, { "url": "https://git.kernel.org/stable/c/ce792b94e03882108019ba996c1a7c4d4e09be2c" }, { "url": "https://git.kernel.org/stable/c/e7600f5cee5de14065f950807931d6e6d40fb2d7" } ], "title": "Revert \"media: v4l2-dev: fix error handling in __video_register_device()\"", "x_generator": { "engine": "bippy-1.2.0" } } } }