{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98523", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.355Z", "datePublished": "2026-10-18T15:17:40.598Z", "dateUpdated": "2026-10-19T09:21:05.087Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:21:05.087Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/client: fix restore of partially initialized client\n\nI got a null-ptr-deref report when closing a DRM file descriptor:\n\nWARNING: drivers/gpu/drm/drm_atomic.c:2031 at\n__drm_atomic_helper_set_config+0x18e/0x1b0 [drm]\n\nCall Trace:\ndrm_client_modeset_commit_atomic+0x16b/0x220 [drm]\ndrm_client_modeset_commit_locked+0x56/0x160 [drm]\ndrm_client_modeset_commit+0x21/0x40 [drm]\n__drm_fb_helper_restore_fbdev_mode_unlocked.part.0+0x7b/0x80\ndrm_fbdev_client_restore+0xe/0x20 [drm_client_lib]\ndrm_client_dev_restore+0x9f/0xc0 [drm]\ndrm_release+0xc5/0xe0 [drm]\n\nThe warning is followed by a NULL pointer dereference:\n\nBUG: kernel NULL pointer dereference, address: 0000000000000008\n\nRIP:\n__drm_fb_helper_restore_fbdev_mode_unlocked.part.0+0x41/0x80\n[drm_kms_helper]\n\nCall Trace:\ndrm_fbdev_client_restore+0xe/0x20 [drm_client_lib]\ndrm_client_dev_restore+0x9f/0xc0 [drm]\ndrm_release+0xc5/0xe0 [drm]\n__fput+0xdc/0x2b0\n__x64_sys_close+0x39/0x80\ndo_syscall_64+0x8d/0x460\nentry_SYSCALL_64_after_hwframe+0x76/0x7e\n\ndrm_client_register() adds the DRM client to the device client list\nbefore invoking the initial hotplug callback. If the hotplug callback\nfails, the client remains registered.\n\nFor the fbdev client, a failure during drm_fb_helper_initial_config()\ncauses the partially initialized fbdev helper to be cleaned up.\ndrm_fb_helper_fini() releases fb_helper->info and leaves it NULL.\n\nThe fbdev client therefore remains registered even though there is no\nfully initialized framebuffer device.\n\nLater, when userspace closes the DRM file descriptor, drm_release()\ncan invoke the restore callbacks of registered DRM clients:\n\ndrm_release()\ndrm_client_dev_restore()\ndrm_fbdev_client_restore()\ndrm_fb_helper_restore_fbdev_mode_unlocked()\n\ndrm_fbdev_client_restore() currently restores the fbdev state\nunconditionally. For a partially initialized fbdev client this can\nsubmit an incomplete modeset state and subsequently access fbdev\nstate which has not been initialized, resulting in the warning and\nNULL pointer dereference above.\n\ndrm_fbdev_client_unregister() already uses fb_helper->info to\ndistinguish a fully probed framebuffer device from a partially\ninitialized client.\n\nUse the same condition in drm_fbdev_client_restore() and skip restore\nif no framebuffer device has been successfully initialized." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/clients/drm_fbdev_client.c" ], "versions": [ { "version": "7f5535fcbba2ce7f1908ee7e5c350032a4b1e9d0", "lessThan": "11edd5b6735d2e1069ddce672b1836713647f7fb", "status": "affected", "versionType": "git" }, { "version": "5d08c44e47b9d41366714552bdd374ac4b595591", "lessThan": "fcbedba553a9c430079ee225df2dc7ab556a2f83", "status": "affected", "versionType": "git" }, { "version": "5d08c44e47b9d41366714552bdd374ac4b595591", "lessThan": "a69c4b678db808c0d89abb8cedeaaac38d1ef182", "status": "affected", "versionType": "git" }, { "version": "5d08c44e47b9d41366714552bdd374ac4b595591", "lessThan": "1fca688e9443003e33cf30453e7a7560367656c9", "status": "affected", "versionType": "git" }, { "version": "6.12.19", "lessThan": "6.12.112", "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/gpu/drm/clients/drm_fbdev_client.c" ], "versions": [ { "version": "6.13", "status": "affected" }, { "version": "0", "lessThan": "6.13", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.55", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.9", "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": "6.12.19", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.55" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.2.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/11edd5b6735d2e1069ddce672b1836713647f7fb" }, { "url": "https://git.kernel.org/stable/c/fcbedba553a9c430079ee225df2dc7ab556a2f83" }, { "url": "https://git.kernel.org/stable/c/a69c4b678db808c0d89abb8cedeaaac38d1ef182" }, { "url": "https://git.kernel.org/stable/c/1fca688e9443003e33cf30453e7a7560367656c9" } ], "title": "drm/client: fix restore of partially initialized client", "x_generator": { "engine": "bippy-1.2.0" } } } }