{"api_version":"1","generated_at":"2026-09-20T14:40:21+00:00","cve":"CVE-2026-93075","urls":{"html":"https://cve.report/CVE-2026-93075","api":"https://cve.report/api/cve/CVE-2026-93075.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-93075","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-93075"},"summary":{"title":"dax/fsdev: clear pgmap ops and owner on unbind","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndax/fsdev: clear pgmap ops and owner on unbind\n\nfsdev_dax_probe() sets pgmap->ops = &fsdev_pagemap_ops and\npgmap->owner = dev_dax, but nothing ever clears them. For a dynamic\ndevice the pgmap is devm-allocated and freed on unbind, so this is\nharmless. For a static device the pgmap is the shared, long-lived one\nowned by the dax bus (kill_dev_dax() only NULLs dev_dax->pgmap for the\nnon-static case), and device.c's probe sets only pgmap->type, never\nclearing ops/owner.\n\nSo after fsdev unbinds a static device the stale fsdev_pagemap_ops\nsurvives on the shared pgmap. If the device is then rebound to\ndevice_dax (MEMORY_DEVICE_GENERIC, which installs no ->memory_failure),\nor the fsdev_dax module is unloaded, a subsequent memory_failure on that\npgmap dispatches through the stale -- and possibly freed -- handler.\n\nRegister a devm action that clears pgmap->ops and pgmap->owner on unbind,\nsymmetric with setting them at probe, so the pgmap carries no fsdev state\nonce fsdev is detached.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:18:01","updated_at":"2026-09-17 17:18:01"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/f48884ac31b6bfc99f36b3f207b8c0cbe5d54bd7","name":"https://git.kernel.org/stable/c/f48884ac31b6bfc99f36b3f207b8c0cbe5d54bd7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9b0f91dc9147a8601cec3d4d83cf13c6aaf71b27","name":"https://git.kernel.org/stable/c/9b0f91dc9147a8601cec3d4d83cf13c6aaf71b27","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93075","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93075","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d5406bd458b0ac10b1301a4d5801d85c8f648637 9b0f91dc9147a8601cec3d4d83cf13c6aaf71b27 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d5406bd458b0ac10b1301a4d5801d85c8f648637 f48884ac31b6bfc99f36b3f207b8c0cbe5d54bd7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.1","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.6 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"93075","cve":"CVE-2026-93075","epss":"0.001550000","percentile":"0.050810000","score_date":"2026-09-18","updated_at":"2026-09-19 00:06:17"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/dax/fsdev.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"9b0f91dc9147a8601cec3d4d83cf13c6aaf71b27","status":"affected","version":"d5406bd458b0ac10b1301a4d5801d85c8f648637","versionType":"git"},{"lessThan":"f48884ac31b6bfc99f36b3f207b8c0cbe5d54bd7","status":"affected","version":"d5406bd458b0ac10b1301a4d5801d85c8f648637","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/dax/fsdev.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"7.1"},{"lessThan":"7.1","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"7.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"7.1","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndax/fsdev: clear pgmap ops and owner on unbind\n\nfsdev_dax_probe() sets pgmap->ops = &fsdev_pagemap_ops and\npgmap->owner = dev_dax, but nothing ever clears them. For a dynamic\ndevice the pgmap is devm-allocated and freed on unbind, so this is\nharmless. For a static device the pgmap is the shared, long-lived one\nowned by the dax bus (kill_dev_dax() only NULLs dev_dax->pgmap for the\nnon-static case), and device.c's probe sets only pgmap->type, never\nclearing ops/owner.\n\nSo after fsdev unbinds a static device the stale fsdev_pagemap_ops\nsurvives on the shared pgmap. If the device is then rebound to\ndevice_dax (MEMORY_DEVICE_GENERIC, which installs no ->memory_failure),\nor the fsdev_dax module is unloaded, a subsequent memory_failure on that\npgmap dispatches through the stale -- and possibly freed -- handler.\n\nRegister a devm action that clears pgmap->ops and pgmap->owner on unbind,\nsymmetric with setting them at probe, so the pgmap carries no fsdev state\nonce fsdev is detached."}],"providerMetadata":{"dateUpdated":"2026-09-17T16:10:57.699Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/9b0f91dc9147a8601cec3d4d83cf13c6aaf71b27"},{"url":"https://git.kernel.org/stable/c/f48884ac31b6bfc99f36b3f207b8c0cbe5d54bd7"}],"title":"dax/fsdev: clear pgmap ops and owner on unbind","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-93075","datePublished":"2026-09-17T16:10:57.699Z","dateReserved":"2026-09-17T15:57:05.661Z","dateUpdated":"2026-09-17T16:10:57.699Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:18:01","lastModifiedDate":"2026-09-17 17:18:01","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"93075","Ordinal":"1","Title":"dax/fsdev: clear pgmap ops and owner on unbind","CVE":"CVE-2026-93075","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"93075","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ndax/fsdev: clear pgmap ops and owner on unbind\n\nfsdev_dax_probe() sets pgmap->ops = &fsdev_pagemap_ops and\npgmap->owner = dev_dax, but nothing ever clears them. For a dynamic\ndevice the pgmap is devm-allocated and freed on unbind, so this is\nharmless. For a static device the pgmap is the shared, long-lived one\nowned by the dax bus (kill_dev_dax() only NULLs dev_dax->pgmap for the\nnon-static case), and device.c's probe sets only pgmap->type, never\nclearing ops/owner.\n\nSo after fsdev unbinds a static device the stale fsdev_pagemap_ops\nsurvives on the shared pgmap. If the device is then rebound to\ndevice_dax (MEMORY_DEVICE_GENERIC, which installs no ->memory_failure),\nor the fsdev_dax module is unloaded, a subsequent memory_failure on that\npgmap dispatches through the stale -- and possibly freed -- handler.\n\nRegister a devm action that clears pgmap->ops and pgmap->owner on unbind,\nsymmetric with setting them at probe, so the pgmap carries no fsdev state\nonce fsdev is detached.","Type":"Description","Title":"dax/fsdev: clear pgmap ops and owner on unbind"}]}}}