{"id":"CVE-2026-72080","revision":null,"records":[{"revision":"4789ecd5585046f9b57953eb721cf2c2","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-72080","aliases":[],"title":"fs/resctrl: Fix use-after-free during unmount","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/resctrl: Fix use-after-free during unmount\n\nDuring unmount or failure teardown all mon_data structures that contain\nmonitoring event file private data are freed after which kernfs nodes are\nremoved. However, the RDT_DELETED flag is never set for the statically\nallocated default resource group.\n\nA concurrent reader of an event file associated with the default resource\ngroup may, after dropping kernfs active protection, block on rdtgroup_mutex\nwhile unmount proceeds to free the file private data and destroy the kernfs\nnode without waiting for the reader.\n\nWhen the mutex is released, the reader wakes up, observes that RDT_DELETED\nis not set for the default group, and dereferences the already-freed\nfile private data.\n\nThe scenario can be depicted as follows:\n CPU0 CPU1\n /*\n * Default resource group's\n * monitoring data accessible via\n * kernfs file with kernfs_node::priv\n * pointing to a struct mon_data.\n * User opens the file for reading.\n */\n rdtgroup_mondata_show() /* arch encounters fatal error */\n rdtgroup_kn_lock_live() resctrl_exit()\n atomic_inc(&rdtgroup_default.waitcount) cpus_read_lock()\n kernfs_break_active_protection(kn) mutex_lock(&rdtgroup_mutex)\n cpus_read_lock() resctrl_fs_teardown()\n mutex_lock(&rdtgroup_mutex) rmdir_all_sub()\n mon_put_kn_priv()\n /* Delete all mon_data structures */\n rdtgroup_destroy_root()\n kernfs_destroy_root()\n rdtgroup_default.kn = NULL\n mutex_unlock(&rdtgroup_mutex)\n /*\n * rdtgroup_default.flags is empty so\n * rdtgroup_kn_lock_live() returns\n * &rdtgroup_default\n */\n md = of->kn->priv;\n\n /* md points to freed mon_data */\n\nSet RDT_DELETED for the default group unconditionally since the flag does\nnot lead to the freeing of this statically allocated group.\n\nDo not allow a new resctrl mount if there are any waiters on default group\nof previous mount. A new mount will re-initialize the default group that\nwould appear to waiters from previous mount as though the default group is\naccessible causing them to access the mon_data structures from the previous\nmount that have been removed.","state":0,"publishedAt":"2026-08-15T05:52:29.827+00:00","modifiedAt":"2026-10-19T21:19:26.766+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/resctrl/rdtgroup.c\"\n ],\n \"versions\": [\n {\n \"version\": \"2a65660385444e9d9deffe995c71ee20443ef76e\",\n \"lessThan\": \"7b7bb07efe41bb646a93c4624aa2bb35df190342\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2a65660385444e9d9deffe995c71ee20443ef76e\",\n \"lessThan\": \"7d330a1d663381579b9d5dafa642b1b3158a0ce2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"2a65660385444e9d9deffe995c71ee20443ef76e\",\n \"lessThan\": \"52fce648607e0d6a76eeb443d78708c49df1c554\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/resctrl/rdtgroup.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.16\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.16\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.42\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.5\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/7b7bb07efe41bb646a93c4624aa2bb35df190342","https://git.kernel.org/stable/c/7d330a1d663381579b9d5dafa642b1b3158a0ce2","https://git.kernel.org/stable/c/52fce648607e0d6a76eeb443d78708c49df1c554"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72080","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-72080","identifiers":["CVE-2026-72080"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-08T15:12:21.7721538+00:00","complete":true,"records":1769,"lastAttemptAt":"2026-11-08T15:12:21.7721538+00:00","lastSuccessAt":"2026-11-08T15:12:23.3131168+00:00","error":null,"lastVerifiedAt":"2026-11-08T15:12:23.3132386+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-eaa64dac63caa79c8d4905619258c41c51b39e461b996124e1a21b5e85e7e738-a99d659450dc34354959c6122d848d4ccd07f29ea21abcc1586cf3d160224c73","complete":true,"records":421173,"lastAttemptAt":"2026-11-08T15:11:37.1519474+00:00","lastSuccessAt":"2026-11-08T15:04:21.1700721+00:00","error":null,"lastVerifiedAt":"2026-11-08T15:11:37.1519474+00:00","snapshotPublishedAt":"2026-11-08T14:26:36+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-383c643166b94ac4b6a615647191978e","complete":true,"records":13654,"lastAttemptAt":"2026-11-08T15:12:52.0979565+00:00","lastSuccessAt":"2026-11-08T13:04:50.073+00:00","error":null,"lastVerifiedAt":"2026-11-08T13:04:50.073+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13706,"expectedIdentifiers":13706,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-08T15:12:21.7721538+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-08T15:12:21.7721538+00:00","lastSuccessAt":"2026-11-08T15:12:25.6162622+00:00","error":null,"lastVerifiedAt":"2026-11-08T15:12:25.6162636+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-88d28889864e42cea6aa55e892fd5cd0","complete":false,"records":13666,"lastAttemptAt":"2026-11-08T15:12:51.2847048+00:00","lastSuccessAt":"2026-11-08T15:12:51.28+00:00","error":null,"lastVerifiedAt":"2026-11-08T15:12:51.28+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13685,"expectedIdentifiers":13706,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-980593e6977a6d1b4fb1eed5a1ffe88a468736f89f0a06f710924ad59132c023","complete":true,"records":9914,"lastAttemptAt":"2026-11-08T15:12:21.6170274+00:00","lastSuccessAt":"2026-11-08T11:07:07.068788+00:00","error":null,"lastVerifiedAt":"2026-11-08T15:12:21.6170274+00:00","snapshotPublishedAt":"2026-11-08T11:02:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-fde804134ecdda0ddd5ff5c26ee1fff5a6fa659311f7ef2e51c6ad54964db0e2","complete":true,"records":1971,"lastAttemptAt":"2026-11-08T15:12:14.3193577+00:00","lastSuccessAt":"2026-11-06T19:03:17.0399903+00:00","error":"HttpRequestException","lastVerifiedAt":"2026-11-08T15:04:21.421573+00:00","snapshotPublishedAt":"2026-11-06T18:17:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-964c14035e6f0f6478b2870fad6a7ef9f6045876d4a12af2c2e514521e54b6af","complete":true,"records":3055,"lastAttemptAt":"2026-11-08T15:12:21.6447495+00:00","lastSuccessAt":"2026-11-08T11:07:12.1927025+00:00","error":null,"lastVerifiedAt":"2026-11-08T15:12:21.6447495+00:00","snapshotPublishedAt":"2026-11-08T11:02:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-f8647d7ba64b1ba0dfdc7130944766d5b36d5b77d18fff0c79e651a4cff3c2b9","complete":true,"records":231293,"lastAttemptAt":"2026-11-08T15:12:19.9920749+00:00","lastSuccessAt":"2026-11-08T11:06:56.2918717+00:00","error":null,"lastVerifiedAt":"2026-11-08T15:12:19.9920749+00:00","snapshotPublishedAt":"2026-11-08T11:02:50+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}