{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89823", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.768Z", "datePublished": "2026-09-16T10:30:55.534Z", "dateUpdated": "2026-10-19T08:53:17.224Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:53:17.224Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm: fix race between partial drm_dev_register() failure and ioctl\n\nIf drm_dev_register() fails after registering a minor (e.g. render minor\nregistered, primary minor fails), userspace could have opened the first\nminor and entered a drm_dev_enter() critical section. Since the\nunplugged flag was never set, the ioctl proceeds while the error path\ntears down device resources.\n\nFix this by introducing drm_dev_synchronize_unplug(), which sets the\nunplugged flag and waits for the SRCU barrier, ensuring all in-flight\ndrm_dev_enter() critical sections complete before cleanup proceeds; call\nit on the error path of drm_dev_register()." } ], "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 race is entered by opening a newly published DRM minor (/dev/dri/renderD* or card*) and issuing ioctl/mmap into drm_dev_enter(); that is a local char-dev syscall path, not network, adjacent-radio, or USB packet processing.\nAC:L - The attacker controls the userspace side (inotify on the new node, open, concurrent DRM_RENDER_ALLOW ioctl/mmap) and can force later drm_dev_register() steps to fail after the first minor is live (ENOMEM in create_compat_control_link or drm_modeset_register_all). Modern drivers skip drm_global_mutex, so open is not serialized with register.\nPR:L - The commit's example publishes the render minor first; that node has no CAP_SYS_ADMIN check, and the overlapping ioctls are DRM_RENDER_ALLOW. Unprivileged local users on phones, desktops, and GPU VMs routinely open /dev/dri/renderD*.\nUI:N - The attacker opens their own DRM fd and issues ioctls; GPU or hotplug display probe runs in kernel driver init and does not require a victim to mount media or open a file.\nS:U - The use-after-free is of host-kernel DRM/driver resources that drm_dev_enter() is meant to protect, remaining in the same kernel authority; this is not a VM escape or IOMMU/DMA bypass.\nC:H - On drm_dev_register() error, probe rollback frees devm MMIO and driver objects while an in-flight drm_dev_enter() ioctl/mmap still uses them, a use-after-free that enables kernel memory disclosure.\nI:H - The same use-after-free of driver state during concurrent ioctl/mmap allows heap spraying, arbitrary writes, and control-flow hijack, matching kernel guidance that UAF is Integrity High.\nA:H - Racing ioctl/mmap against probe teardown oopses or panics via stale mappings or freed objects; a use-after-free also crashes when not fully exploited." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/drm_drv.c" ], "versions": [ { "version": "bee330f3d67273a68dcb99f59480d59553c008b2", "lessThan": "26d9162213952927cd59c0d94b7e0e992b347bec", "status": "affected", "versionType": "git" }, { "version": "bee330f3d67273a68dcb99f59480d59553c008b2", "lessThan": "24d28d15c0f7f7d4a1c229f8730314f0f8758810", "status": "affected", "versionType": "git" }, { "version": "bee330f3d67273a68dcb99f59480d59553c008b2", "lessThan": "6729990df9e70623bf53f855b521ae71ca9cb278", "status": "affected", "versionType": "git" }, { "version": "bee330f3d67273a68dcb99f59480d59553c008b2", "lessThan": "a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22c", "status": "affected", "versionType": "git" }, { "version": "bee330f3d67273a68dcb99f59480d59553c008b2", "lessThan": "19dbfe4d586aecfed121cb3fa62281761d9d341f", "status": "affected", "versionType": "git" }, { "version": "bee330f3d67273a68dcb99f59480d59553c008b2", "lessThan": "79d09cfe90304ff4f195e47d569800f5e0f8b854", "status": "affected", "versionType": "git" }, { "version": "bee330f3d67273a68dcb99f59480d59553c008b2", "lessThan": "2d1215a72159d00001e08dee162e27718934bee9", "status": "affected", "versionType": "git" }, { "version": "bee330f3d67273a68dcb99f59480d59553c008b2", "lessThan": "eb197f7d60f00d0f5b1b3505dfc86a7e36045a3e", "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/gpu/drm/drm_drv.c" ], "versions": [ { "version": "4.18", "status": "affected" }, { "version": "0", "lessThan": "4.18", "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": "4.18", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.18.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "7.2.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/26d9162213952927cd59c0d94b7e0e992b347bec" }, { "url": "https://git.kernel.org/stable/c/24d28d15c0f7f7d4a1c229f8730314f0f8758810" }, { "url": "https://git.kernel.org/stable/c/6729990df9e70623bf53f855b521ae71ca9cb278" }, { "url": "https://git.kernel.org/stable/c/a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22c" }, { "url": "https://git.kernel.org/stable/c/19dbfe4d586aecfed121cb3fa62281761d9d341f" }, { "url": "https://git.kernel.org/stable/c/79d09cfe90304ff4f195e47d569800f5e0f8b854" }, { "url": "https://git.kernel.org/stable/c/2d1215a72159d00001e08dee162e27718934bee9" }, { "url": "https://git.kernel.org/stable/c/eb197f7d60f00d0f5b1b3505dfc86a7e36045a3e" } ], "title": "drm: fix race between partial drm_dev_register() failure and ioctl", "x_generator": { "engine": "bippy-1.2.0" } } } }