CVE-2026-89741

{"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 \u2192 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": 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/media/v4l2-core/v4l2-dev.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8b998c171ed875e402e1fd1c5cd619e4ca05e9c1", "status": "affected", "version": "e5c8e62ae551e0ad2e15412aa0c57c2856d59677", "versionType": "git"}, {"lessThan": "3de14b4f681a1b3c6d375d98d9d37a55ebb85349", "status": "affected", "version": "8b451a9a46f2bfc510e6d5c2492df91647586184", "versionType": "git"}, {"lessThan": "8027f82c0f5474ed72448e160ee9778051fa1f49", "status": "affected", "version": "b6be1f5633eae200af2527e9eeb7f51be5739b0f", "versionType": "git"}, {"lessThan": "2ac009a65d2385e9f0799eaf9d9694a29153a161", "status": "affected", "version": "ae7b143e05b36fc69d6571751855946cc45064c6", "versionType": "git"}, {"lessThan": "712ca1cf756de2557a116e0df55791bac0c9f99e", "status": "affected", "version": "2429bb9fad88c8fa84c4956b0a21cf5afe5e92b7", "versionType": "git"}, {"lessThan": "aad08b5f67d2a8116e1a00bce2611c1513b10bce", "status": "affected", "version": "2a934fdb01db6458288fc9386d3d8ceba6dd551a", "versionType": "git"}, {"lessThan": "ce792b94e03882108019ba996c1a7c4d4e09be2c", "status": "affected", "version": "2a934fdb01db6458288fc9386d3d8ceba6dd551a", "versionType": "git"}, {"lessThan": "e7600f5cee5de14065f950807931d6e6d40fb2d7", "status": "affected", "version": "2a934fdb01db6458288fc9386d3d8ceba6dd551a", "versionType": "git"}, {"status": "affected", "version": "ee141706e701356dda41c6fed9ee18bf427c28e3", "versionType": "git"}, {"status": "affected", "version": "4451412739ed33a49b34624299394ee575116d0c", "versionType": "git"}, {"lessThan": "5.10.270", "status": "affected", "version": "5.10.239", "versionType": "semver"}, {"lessThan": "5.15.221", "status": "affected", "version": "5.15.186", "versionType": "semver"}, {"lessThan": "6.1.188", "status": "affected", "version": "6.1.142", "versionType": "semver"}, {"lessThan": "6.6.157", "status": "affected", "version": "6.6.95", "versionType": "semver"}, {"lessThan": "6.12.109", "status": "affected", "version": "6.12.35", "versionType": "semver"}, {"lessThan": "5.5", "status": "affected", "version": "5.4.295", "versionType": "semver"}, {"lessThan": "6.16", "status": "affected", "version": "6.15.4", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/media/v4l2-core/v4l2-dev.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.16"}, {"lessThan": "6.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-89741", "lastModified": "2026-10-19T09:18:16.883", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-11T20:20:04.720", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2ac009a65d2385e9f0799eaf9d9694a29153a161"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3de14b4f681a1b3c6d375d98d9d37a55ebb85349"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/712ca1cf756de2557a116e0df55791bac0c9f99e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8027f82c0f5474ed72448e160ee9778051fa1f49"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8b998c171ed875e402e1fd1c5cd619e4ca05e9c1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/aad08b5f67d2a8116e1a00bce2611c1513b10bce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ce792b94e03882108019ba996c1a7c4d4e09be2c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e7600f5cee5de14065f950807931d6e6d40fb2d7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel (v4l2-dev): Double-free vulnerability due to incorrect error handling", "id": "2532384", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532384"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-1341", "details": ["A flaw was found in the Linux kernel's media subsystem, specifically within the v4l2-dev component. This vulnerability arises from incorrect error handling in the `__video_register_device()` function. If a device registration fails, the system attempts to free the same memory region twice, leading to a double-free condition. This type of flaw can result in system instability, memory corruption, or a denial of service (DoS)."], "name": "CVE-2026-89741", "public_date": "2026-09-11T19:46:47Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89741\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89741\nhttps://git.kernel.org/stable/c/712ca1cf756de2557a116e0df55791bac0c9f99e\nhttps://git.kernel.org/stable/c/aad08b5f67d2a8116e1a00bce2611c1513b10bce\nhttps://git.kernel.org/stable/c/ce792b94e03882108019ba996c1a7c4d4e09be2c\nhttps://git.kernel.org/stable/c/e7600f5cee5de14065f950807931d6e6d40fb2d7"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2429bb9fad88c8fa84c4956b0a21cf5afe5e92b7,712ca1cf756de2557a116e0df55791bac0c9f99e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2a934fdb01db6458288fc9386d3d8ceba6dd551a,aad08b5f67d2a8116e1a00bce2611c1513b10bce)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2a934fdb01db6458288fc9386d3d8ceba6dd551a,ce792b94e03882108019ba996c1a7c4d4e09be2c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2a934fdb01db6458288fc9386d3d8ceba6dd551a,e7600f5cee5de14065f950807931d6e6d40fb2d7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "ee141706e701356dda41c6fed9ee18bf427c28e3"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "e5c8e62ae551e0ad2e15412aa0c57c2856d59677"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "8b451a9a46f2bfc510e6d5c2492df91647586184"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "b6be1f5633eae200af2527e9eeb7f51be5739b0f"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "ae7b143e05b36fc69d6571751855946cc45064c6"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "4451412739ed33a49b34624299394ee575116d0c"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.35,6.12.109)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.4.295,5.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.10.239,5.11)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.186,5.16)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.142,6.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.95,6.7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.15.4,6.16)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.109,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.2.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T08:45:11.057441+00:00", "updated": "2026-09-15T19:30:12.130631+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}