{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89998", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.780Z", "datePublished": "2026-09-16T10:33:10.012Z", "dateUpdated": "2026-10-19T08:56:12.250Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:56:12.250Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm: fix race when loading and unloading a table\n\nIf the userspace calls two concurrent table load ioctls and one of them\nsucceeds and the other fails, there is a race condition because\ndm_setup_md_queue walks &md->table_devices without any lock. If the walk\nraces with dm_table_destroy -> free_devices -> dm_put_table_device, there\nis access to invalid memory.\n\nFix this race by extending the lock over the list walk." } ], "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 reached only through local DM_TABLE_LOAD ioctls on /dev/mapper/control (ctl_ioctl → table_load → dm_setup_md_queue walking md->table_devices). No network, Bluetooth, or physical-bus path loads a device-mapper table.\nAC:L - The attacker issues two concurrent table-load ioctls on a mapped device they created, owning both sides of the race: one load fails after populate_table added devices and dm_table_destroy frees them while the other walks the list. Device-mapper is a standard distro component, not a rare config.\nPR:L - ctl_ioctl requires capable(CAP_SYS_ADMIN). In the most severe reasonable deployment that capability is held by a container, CSI, or LVM/storage-stack administrator with delegated /dev/mapper/control rather than exclusive host root, matching kernel-CNA scoring of other device-mapper ioctl bugs as Low.\nUI:N - The attacker performs every step with its own ioctls (DM_DEV_CREATE then concurrent DM_TABLE_LOAD). No separate victim action such as mounting a filesystem or opening a file is required.\nS:U - The use-after-free of struct table_device stays inside the host kernel's security authority. This is standard kernel memory corruption, not a VM, IOMMU, or sandbox boundary crossing.\nC:H - dm_setup_md_queue walks md->table_devices and dereferences td->dm_dev.bdev after a concurrent dm_table_destroy has kfree'd the table_device. Reclaiming that slab object yields an arbitrary kernel read, so confidentiality is High.\nI:H - The same use-after-free lets an attacker spray a replacement object so bd_link_disk_holder writes through an attacker-controlled bdev pointer, a classic heap UAF write and control-flow hijack primitive, so integrity is High.\nA:H - Walking a freed table_device list entry or calling bd_link_disk_holder on a dangling bdev causes a kernel oops, panic, or hang, which is a complete availability impact." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/md/dm.c" ], "versions": [ { "version": "773bfda35c9511734d7f898e2ee73cd60d2a3f38", "lessThan": "b02e35b81176c7d61dd441cc7a2e5c324a82444b", "status": "affected", "versionType": "git" }, { "version": "1a581b72169968f4154b5793828f3bc28b258b35", "lessThan": "0ea6e5ad4a5817e91f11b4cc1e022e575ed2e7ca", "status": "affected", "versionType": "git" }, { "version": "1a581b72169968f4154b5793828f3bc28b258b35", "lessThan": "a1af1884c960b98c621b6fe2fea1216b78c02152", "status": "affected", "versionType": "git" }, { "version": "1a581b72169968f4154b5793828f3bc28b258b35", "lessThan": "af1f32ccf8051f4691ced11feb452b9d13561727", "status": "affected", "versionType": "git" }, { "version": "1a581b72169968f4154b5793828f3bc28b258b35", "lessThan": "00ad6f9ed27f91925d4d3fb7aab50a60d774f998", "status": "affected", "versionType": "git" }, { "version": "1a581b72169968f4154b5793828f3bc28b258b35", "lessThan": "5380c7f6335cc6d77eb77d065105e81155c4d9d3", "status": "affected", "versionType": "git" }, { "version": "600593707c239bb99486925d65540a5020bc1e58", "status": "affected", "versionType": "git" }, { "version": "6.1.2", "lessThan": "6.1.188", "status": "affected", "versionType": "semver" }, { "version": "6.0.16", "lessThan": "6.1", "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/md/dm.c" ], "versions": [ { "version": "6.2", "status": "affected" }, { "version": "0", "lessThan": "6.2", "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": "6.1.2", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.18.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.2.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0.16" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/b02e35b81176c7d61dd441cc7a2e5c324a82444b" }, { "url": "https://git.kernel.org/stable/c/0ea6e5ad4a5817e91f11b4cc1e022e575ed2e7ca" }, { "url": "https://git.kernel.org/stable/c/a1af1884c960b98c621b6fe2fea1216b78c02152" }, { "url": "https://git.kernel.org/stable/c/af1f32ccf8051f4691ced11feb452b9d13561727" }, { "url": "https://git.kernel.org/stable/c/00ad6f9ed27f91925d4d3fb7aab50a60d774f998" }, { "url": "https://git.kernel.org/stable/c/5380c7f6335cc6d77eb77d065105e81155c4d9d3" } ], "title": "dm: fix race when loading and unloading a table", "x_generator": { "engine": "bippy-1.2.0" } } } }