{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89887", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.773Z", "datePublished": "2026-09-16T10:31:51.195Z", "dateUpdated": "2026-10-19T08:54:20.308Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:54:20.308Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: i2c: ov7740: fix use-after-destroy in remove\n\nThe ov7740_remove() function had a severe teardown order bug where it\ndestroyed the driver's mutex before freeing the V4L2 control handler\nwhich relies on that mutex, leading to a use-after-destroy kernel panic.\nFurthermore, the driver explicitly called v4l2_ctrl_handler_free() and\nmutex_destroy() sequentially, but then called ov7740_free_controls()\nwhich invokes both of them a second time, resulting in a double-free.\n\nThis patch fixes the issue by unregistering the subdevice first, and\nrelying exclusively on ov7740_free_controls() to safely tear down the\nmutex and control handler in the correct order." } ], "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 UAF is in ov7740_remove() for the onboard OmniVision OV7740 I2C/CSI camera sensor, reached via local I2C teardown (sysfs unbind, i2c delete_device, rmmod) and V4L2 ioctls on /dev/v4l-subdev* (V4L2_SUBDEV_FL_HAS_DEVNODE). No network, Bluetooth, or USB packet path exists.\nAC:L - ov7740_remove() deterministically mutex_destroy()s ov7740->mutex then v4l2_ctrl_handler_free() locks that same mutex and kvfree()s all v4l2_ctrl objects while the subdev is still registered. An attacker holding the node and driving teardown needs no uncontrollable race or rare debug config.\nPR:L - VIDIOC_G/S_CTRL on the subdev node have no capable() check; udev typically grants /dev/v4l-subdev* to the video group or Android camera UID on SAMA5/embedded boards shipping CONFIG_VIDEO_OV7740. Per CNA driver-removal UAF and media i2c unbind precedent this is PR:L, not init-namespace root.\nUI:N - The attacker opens the V4L2 subdev node and initiates or coordinates driver teardown themselves (unbind/rmmod/maintenance). CNA driver-removal UAFs score UI:N; no separate victim action such as mounting a filesystem is required.\nS:U - The UAF corrupts host kernel heap (struct v4l2_ctrl, v4l2_ctrl_ref, and handler buckets) within the same OS security authority. It is not a VM escape, IOMMU/DMA isolation bypass, or sandbox breakout.\nC:H - v4l2_ctrl_handler_free() kvfree()s each v4l2_ctrl while open fds still hold vfh->ctrl_handler and issue VIDIOC_G_CTRL/G_EXT_CTRLS through dangling ctrl lists. Per kernel UAF guidance this enables arbitrary kernel disclosure, so confidentiality is High.\nI:H - struct v4l2_ctrl embeds ops and type_ops function pointers; VIDIOC_S_CTRL on a sprayed freed object yields control-flow hijack. Kernel UAF guidance scores this High integrity.\nA:H - mutex_lock of the destroyed mutex and later walks of freed ctrl lists after handler_free oops or panic the kernel even when the UAF is not fully turned into a write primitive, so availability is High." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/media/i2c/ov7740.c" ], "versions": [ { "version": "39c5c4471b8d793daf868bd004e56ed420e89707", "lessThan": "9e4693436c7dcf8584002500ce4b434b79bbf9ed", "status": "affected", "versionType": "git" }, { "version": "39c5c4471b8d793daf868bd004e56ed420e89707", "lessThan": "81e9765878d3ac8ad18e3a683332b5d6bc3a0e33", "status": "affected", "versionType": "git" }, { "version": "39c5c4471b8d793daf868bd004e56ed420e89707", "lessThan": "8a02ee6c1c4e88f3a0442bd60d3c77db9a30db5e", "status": "affected", "versionType": "git" }, { "version": "39c5c4471b8d793daf868bd004e56ed420e89707", "lessThan": "7512838a19af0a284a58435292243fad21e57ff1", "status": "affected", "versionType": "git" }, { "version": "39c5c4471b8d793daf868bd004e56ed420e89707", "lessThan": "25e2505866c577db2661e4d431f0907c6ec9a3b4", "status": "affected", "versionType": "git" }, { "version": "39c5c4471b8d793daf868bd004e56ed420e89707", "lessThan": "af81f35e4f429e769b784754e1aa4d7a922470ac", "status": "affected", "versionType": "git" }, { "version": "39c5c4471b8d793daf868bd004e56ed420e89707", "lessThan": "09453b467990e8ef8fe09f45a685f9a625248d33", "status": "affected", "versionType": "git" }, { "version": "39c5c4471b8d793daf868bd004e56ed420e89707", "lessThan": "5d1b3dea5a44124bab6c14a2d71b977dabed54e7", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/media/i2c/ov7740.c" ], "versions": [ { "version": "4.16", "status": "affected" }, { "version": "0", "lessThan": "4.16", "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": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.5", "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": "4.16", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.18.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "7.2.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/9e4693436c7dcf8584002500ce4b434b79bbf9ed" }, { "url": "https://git.kernel.org/stable/c/81e9765878d3ac8ad18e3a683332b5d6bc3a0e33" }, { "url": "https://git.kernel.org/stable/c/8a02ee6c1c4e88f3a0442bd60d3c77db9a30db5e" }, { "url": "https://git.kernel.org/stable/c/7512838a19af0a284a58435292243fad21e57ff1" }, { "url": "https://git.kernel.org/stable/c/25e2505866c577db2661e4d431f0907c6ec9a3b4" }, { "url": "https://git.kernel.org/stable/c/af81f35e4f429e769b784754e1aa4d7a922470ac" }, { "url": "https://git.kernel.org/stable/c/09453b467990e8ef8fe09f45a685f9a625248d33" }, { "url": "https://git.kernel.org/stable/c/5d1b3dea5a44124bab6c14a2d71b977dabed54e7" } ], "title": "media: i2c: ov7740: fix use-after-destroy in remove", "x_generator": { "engine": "bippy-1.2.0" } } } }