CVE-2026-99256

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-99256", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.404Z", "datePublished": "2026-11-03T11:25:14.077Z", "dateUpdated": "2026-11-03T11:40:45.109Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-11-03T11:40:45.109Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm cache: fix issue with background work locking\n\ndm cache used a rw_semaphore for background_work_lock. Write locks on\nrw_semaphores have strict owner semantics, but there was no guarantee\nthat the process that locked background_work_lock was the same process\nthat unlocked it. This can be easily seen using a kernel compiled with\nCONFIG_DEBUG_RWSEMS. Given a dm cache device <cache>, run: 'dmsetup\nsuspend <cache> && dmsetup resume <cache>'. This will trigger a kernel\nwarning:\n\nDEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE))\n\ntriggered by cache_resume(). To fix this, switch from a rw_semaphore to\na spinlock and a wait queue. dm cache already has a wait queue and\nassociated counter, migration_wait and nr_allocated_migrations, that was\ngetting woken up when background work was getting completed, but wasn't\nactually used by anything. This is replaced by the background_work queue\nand counter."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/dm-cache-target.c"], "versions": [{"version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f", "lessThan": "0c7a8cad7c96012a9157a189649e569d0390f384", "status": "affected", "versionType": "git"}, {"version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f", "lessThan": "f5db935d257023c3ef410bd39163b949b0e5a55d", "status": "affected", "versionType": "git"}, {"version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f", "lessThan": "6290507ecc0dd6dd40759729cbbbd49b1d2a63c4", "status": "affected", "versionType": "git"}, {"version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f", "lessThan": "8433fd005c25fd127021f67c9144a879fb585572", "status": "affected", "versionType": "git"}, {"version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f", "lessThan": "2f2cfa16dd0f4179bb988139dd37d00a42324f6c", "status": "affected", "versionType": "git"}, {"version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f", "lessThan": "73df2ff409f3db95029982fe3656329568e3715d", "status": "affected", "versionType": "git"}, {"version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f", "lessThan": "104f09e02038b0fc6bbb718b3976af029e15c1d0", "status": "affected", "versionType": "git"}, {"version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f", "lessThan": "bc9781c0247de107876f32929f1637db93a42b34", "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/md/dm-cache-target.c"], "versions": [{"version": "4.12", "status": "affected"}, {"version": "0", "lessThan": "4.12", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.161", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.115", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.59", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.13", "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": "4.12", "versionEndExcluding": "5.10.273"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "5.15.224"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.6.161"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.12.115"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.18.59"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "7.2.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0c7a8cad7c96012a9157a189649e569d0390f384"}, {"url": "https://git.kernel.org/stable/c/f5db935d257023c3ef410bd39163b949b0e5a55d"}, {"url": "https://git.kernel.org/stable/c/6290507ecc0dd6dd40759729cbbbd49b1d2a63c4"}, {"url": "https://git.kernel.org/stable/c/8433fd005c25fd127021f67c9144a879fb585572"}, {"url": "https://git.kernel.org/stable/c/2f2cfa16dd0f4179bb988139dd37d00a42324f6c"}, {"url": "https://git.kernel.org/stable/c/73df2ff409f3db95029982fe3656329568e3715d"}, {"url": "https://git.kernel.org/stable/c/104f09e02038b0fc6bbb718b3976af029e15c1d0"}, {"url": "https://git.kernel.org/stable/c/bc9781c0247de107876f32929f1637db93a42b34"}], "title": "dm cache: fix issue with background work locking", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/md/dm-cache-target.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "0c7a8cad7c96012a9157a189649e569d0390f384", "status": "affected", "version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f", "versionType": "git"}, {"lessThan": "f5db935d257023c3ef410bd39163b949b0e5a55d", "status": "affected", "version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f", "versionType": "git"}, {"lessThan": "6290507ecc0dd6dd40759729cbbbd49b1d2a63c4", "status": "affected", "version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f", "versionType": "git"}, {"lessThan": "8433fd005c25fd127021f67c9144a879fb585572", "status": "affected", "version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f", "versionType": "git"}, {"lessThan": "2f2cfa16dd0f4179bb988139dd37d00a42324f6c", "status": "affected", "version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f", "versionType": "git"}, {"lessThan": "73df2ff409f3db95029982fe3656329568e3715d", "status": "affected", "version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f", "versionType": "git"}, {"lessThan": "104f09e02038b0fc6bbb718b3976af029e15c1d0", "status": "affected", "version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f", "versionType": "git"}, {"lessThan": "bc9781c0247de107876f32929f1637db93a42b34", "status": "affected", "version": "b29d4986d0da1a27cd35917cdb433672f5c95d7f", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/md/dm-cache-target.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.12"}, {"lessThan": "4.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.273", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.224", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.161", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.115", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.59", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.13", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm cache: fix issue with background work locking\n\ndm cache used a rw_semaphore for background_work_lock. Write locks on\nrw_semaphores have strict owner semantics, but there was no guarantee\nthat the process that locked background_work_lock was the same process\nthat unlocked it. This can be easily seen using a kernel compiled with\nCONFIG_DEBUG_RWSEMS. Given a dm cache device <cache>, run: 'dmsetup\nsuspend <cache> && dmsetup resume <cache>'. This will trigger a kernel\nwarning:\n\nDEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE))\n\ntriggered by cache_resume(). To fix this, switch from a rw_semaphore to\na spinlock and a wait queue. dm cache already has a wait queue and\nassociated counter, migration_wait and nr_allocated_migrations, that was\ngetting woken up when background work was getting completed, but wasn't\nactually used by anything. This is replaced by the background_work queue\nand counter."}], "id": "CVE-2026-99256", "lastModified": "2026-11-03T12:17:32.437", "metrics": {}, "published": "2026-11-03T12:17:32.437", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0c7a8cad7c96012a9157a189649e569d0390f384"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/104f09e02038b0fc6bbb718b3976af029e15c1d0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2f2cfa16dd0f4179bb988139dd37d00a42324f6c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6290507ecc0dd6dd40759729cbbbd49b1d2a63c4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/73df2ff409f3db95029982fe3656329568e3715d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8433fd005c25fd127021f67c9144a879fb585572"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bc9781c0247de107876f32929f1637db93a42b34"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f5db935d257023c3ef410bd39163b949b0e5a55d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: kernel: Denial of Service via improper lock ownership handling in dm-cache", "id": "2565716", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2565716"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-413", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndm cache: fix issue with background work locking\ndm cache used a rw_semaphore for background_work_lock. Write locks on\nrw_semaphores have strict owner semantics, but there was no guarantee\nthat the process that locked background_work_lock was the same process\nthat unlocked it. This can be easily seen using a kernel compiled with\nCONFIG_DEBUG_RWSEMS. Given a dm cache device <cache>, run: 'dmsetup\nsuspend <cache> && dmsetup resume <cache>'. This will trigger a kernel\nwarning:\nDEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE))\ntriggered by cache_resume(). To fix this, switch from a rw_semaphore to\na spinlock and a wait queue. dm cache already has a wait queue and\nassociated counter, migration_wait and nr_allocated_migrations, that was\ngetting woken up when background work was getting completed, but wasn't\nactually used by anything. This is replaced by the background_work queue\nand counter.", "A flaw was found in the Linux kernel's Device Mapper cache (dm-cache) subsystem. Improper lock ownership handling in the background work locking mechanism allows a lock to be released by a different process than the one that acquired it when suspending and resuming a cache device. A local user with administrative privileges could trigger this condition, leading to kernel locking inconsistencies and a potential Denial of Service (DoS)."], "name": "CVE-2026-99256", "package_state": [{"cpe": "cpe:/a:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:rhel_els:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:rhel_els:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:rhel_els:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/a:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:5", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-10", "product_name": "Red Hat OpenShift Container Platform 5"}, {"cpe": "cpe:/a:redhat:openshift:5", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 5"}], "public_date": "2026-11-03T11:25:14Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-99256\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-99256\nhttps://git.kernel.org/stable/c/0c7a8cad7c96012a9157a189649e569d0390f384\nhttps://git.kernel.org/stable/c/104f09e02038b0fc6bbb718b3976af029e15c1d0\nhttps://git.kernel.org/stable/c/2f2cfa16dd0f4179bb988139dd37d00a42324f6c\nhttps://git.kernel.org/stable/c/6290507ecc0dd6dd40759729cbbbd49b1d2a63c4\nhttps://git.kernel.org/stable/c/73df2ff409f3db95029982fe3656329568e3715d\nhttps://git.kernel.org/stable/c/8433fd005c25fd127021f67c9144a879fb585572\nhttps://git.kernel.org/stable/c/bc9781c0247de107876f32929f1637db93a42b34\nhttps://git.kernel.org/stable/c/f5db935d257023c3ef410bd39163b949b0e5a55d"], "threat_severity": "Moderate"}

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"linux"}], "created": "2026-11-03T13:00:10.231564+00:00", "updated": "2026-11-05T16:45:06.280209+00:00", "vendors": ["linux", "linux$PRODUCT$linux", "linux$PRODUCT$linux_kernel"]}