{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-22995", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.938Z", "datePublished": "2026-01-23T15:24:15.684Z", "dateUpdated": "2026-02-09T08:36:46.675Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-02-09T08:36:46.675Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nublk: fix use-after-free in ublk_partition_scan_work\n\nA race condition exists between the async partition scan work and device\nteardown that can lead to a use-after-free of ub->ub_disk:\n\n1. ublk_ctrl_start_dev() schedules partition_scan_work after add_disk()\n2. ublk_stop_dev() calls ublk_stop_dev_unlocked() which does:\n - del_gendisk(ub->ub_disk)\n - ublk_detach_disk() sets ub->ub_disk = NULL\n - put_disk() which may free the disk\n3. The worker ublk_partition_scan_work() then dereferences ub->ub_disk\n leading to UAF\n\nFix this by using ublk_get_disk()/ublk_put_disk() in the worker to hold\na reference to the disk during the partition scan. The spinlock in\nublk_get_disk() synchronizes with ublk_detach_disk() ensuring the worker\neither gets a valid reference or sees NULL and exits early.\n\nAlso change flush_work() to cancel_work_sync() to avoid running the\npartition scan work unnecessarily when the disk is already detached."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/block/ublk_drv.c"], "versions": [{"version": "63dfbcd59b4b823eac4441efff10b1c303c8f49f", "lessThan": "72e28774e9644c2bdbb4920842fbf77103a15a85", "status": "affected", "versionType": "git"}, {"version": "7fc4da6a304bdcd3de14fc946dc2c19437a9cc5a", "lessThan": "f0d385f6689f37a2828c686fb279121df006b4cb", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/block/ublk_drv.c"], "versions": [{"version": "6.18.4", "lessThan": "6.18.6", "status": "affected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.4", "versionEndExcluding": "6.18.6"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/72e28774e9644c2bdbb4920842fbf77103a15a85"}, {"url": "https://git.kernel.org/stable/c/f0d385f6689f37a2828c686fb279121df006b4cb"}], "title": "ublk: fix use-after-free in ublk_partition_scan_work", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nublk: fix use-after-free in ublk_partition_scan_work\n\nA race condition exists between the async partition scan work and device\nteardown that can lead to a use-after-free of ub->ub_disk:\n\n1. ublk_ctrl_start_dev() schedules partition_scan_work after add_disk()\n2. ublk_stop_dev() calls ublk_stop_dev_unlocked() which does:\n - del_gendisk(ub->ub_disk)\n - ublk_detach_disk() sets ub->ub_disk = NULL\n - put_disk() which may free the disk\n3. The worker ublk_partition_scan_work() then dereferences ub->ub_disk\n leading to UAF\n\nFix this by using ublk_get_disk()/ublk_put_disk() in the worker to hold\na reference to the disk during the partition scan. The spinlock in\nublk_get_disk() synchronizes with ublk_detach_disk() ensuring the worker\neither gets a valid reference or sees NULL and exits early.\n\nAlso change flush_work() to cancel_work_sync() to avoid running the\npartition scan work unnecessarily when the disk is already detached."}], "id": "CVE-2026-22995", "lastModified": "2026-01-26T15:03:33.357", "metrics": {}, "published": "2026-01-23T16:15:55.603", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/72e28774e9644c2bdbb4920842fbf77103a15a85"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f0d385f6689f37a2828c686fb279121df006b4cb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: ublk: fix use-after-free in ublk_partition_scan_work", "id": "2432379", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2432379"}, "csaw": false, "details": ["No description is available for this CVE."], "name": "CVE-2026-22995", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-01-23T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-22995\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-22995\nhttps://lore.kernel.org/linux-cve-announce/2026012352-CVE-2026-22995-7465@gregkh/T"], "threat_severity": "Moderate"}

{}