{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89600", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.732Z", "datePublished": "2026-09-11T19:45:03.450Z", "dateUpdated": "2026-09-11T19:45:03.450Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:45:03.450Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfanotify: fix use-after-free of file range info\n\nfsnotify_pre_content() builds its file_range on the triggering task's\nstack. fanotify_alloc_perm_event() saves a pointer to range.pos in the\nheap-allocated permission event so copy_range_info_to_user() can report\nthe offset later.\n\nThe event reader can set the event state to FAN_EVENT_REPORTED and then\nsleep while preparing the file descriptor. If a signal interrupts the\ntriggering task at that point, fanotify_get_response() changes the state\nto FAN_EVENT_CANCELED and returns. This unwinds the file_range stack\nframe while the reader still owns the event. The reader then dereferences\npevent->ppos and copies the stale stack value to userspace.\n\nKASAN reported:\n\n BUG: KASAN: use-after-free in fanotify_read+0x293e/0x2970\n Read of size 8 at addr ffff88811434fc50 by task fanotify_inotif/95\n Call Trace:\n fanotify_read+0x293e/0x2970\n vfs_read+0x177/0xa20\n ksys_read+0xf7/0x1c0\n do_syscall_64+0xf9/0x540\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nStore the range position directly in the permission event and use\nFANOTIFY_NO_RANGE when range information is unavailable. The event remains\nalive until the reader finishes, so the reported offset no longer depends\non the triggering task's stack."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/notify/fanotify/fanotify.c", "fs/notify/fanotify/fanotify.h", "fs/notify/fanotify/fanotify_user.c"], "versions": [{"version": "870499bc1d4dc04cba1f63dd5e7bc02b983e2458", "lessThan": "66aa9a9e6481bfa512ee5b6380eaaec455a954d2", "status": "affected", "versionType": "git"}, {"version": "870499bc1d4dc04cba1f63dd5e7bc02b983e2458", "lessThan": "b8f73b163b646bc56d4dce9c697a578e333f4894", "status": "affected", "versionType": "git"}, {"version": "870499bc1d4dc04cba1f63dd5e7bc02b983e2458", "lessThan": "d7f1cf5be33ef0175a4e8ed8687aeb98fb00a851", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/notify/fanotify/fanotify.c", "fs/notify/fanotify/fanotify.h", "fs/notify/fanotify/fanotify_user.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "6.14", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/66aa9a9e6481bfa512ee5b6380eaaec455a954d2"}, {"url": "https://git.kernel.org/stable/c/b8f73b163b646bc56d4dce9c697a578e333f4894"}, {"url": "https://git.kernel.org/stable/c/d7f1cf5be33ef0175a4e8ed8687aeb98fb00a851"}], "title": "fanotify: fix use-after-free of file range info", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/notify/fanotify/fanotify.c", "fs/notify/fanotify/fanotify.h", "fs/notify/fanotify/fanotify_user.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "66aa9a9e6481bfa512ee5b6380eaaec455a954d2", "status": "affected", "version": "870499bc1d4dc04cba1f63dd5e7bc02b983e2458", "versionType": "git"}, {"lessThan": "b8f73b163b646bc56d4dce9c697a578e333f4894", "status": "affected", "version": "870499bc1d4dc04cba1f63dd5e7bc02b983e2458", "versionType": "git"}, {"lessThan": "d7f1cf5be33ef0175a4e8ed8687aeb98fb00a851", "status": "affected", "version": "870499bc1d4dc04cba1f63dd5e7bc02b983e2458", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/notify/fanotify/fanotify.c", "fs/notify/fanotify/fanotify.h", "fs/notify/fanotify/fanotify_user.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "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\nfanotify: fix use-after-free of file range info\n\nfsnotify_pre_content() builds its file_range on the triggering task's\nstack. fanotify_alloc_perm_event() saves a pointer to range.pos in the\nheap-allocated permission event so copy_range_info_to_user() can report\nthe offset later.\n\nThe event reader can set the event state to FAN_EVENT_REPORTED and then\nsleep while preparing the file descriptor. If a signal interrupts the\ntriggering task at that point, fanotify_get_response() changes the state\nto FAN_EVENT_CANCELED and returns. This unwinds the file_range stack\nframe while the reader still owns the event. The reader then dereferences\npevent->ppos and copies the stale stack value to userspace.\n\nKASAN reported:\n\n BUG: KASAN: use-after-free in fanotify_read+0x293e/0x2970\n Read of size 8 at addr ffff88811434fc50 by task fanotify_inotif/95\n Call Trace:\n fanotify_read+0x293e/0x2970\n vfs_read+0x177/0xa20\n ksys_read+0xf7/0x1c0\n do_syscall_64+0xf9/0x540\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nStore the range position directly in the permission event and use\nFANOTIFY_NO_RANGE when range information is unavailable. The event remains\nalive until the reader finishes, so the reported offset no longer depends\non the triggering task's stack."}], "id": "CVE-2026-89600", "lastModified": "2026-09-11T20:19:44.870", "metrics": {}, "published": "2026-09-11T20:19:44.870", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/66aa9a9e6481bfa512ee5b6380eaaec455a954d2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b8f73b163b646bc56d4dce9c697a578e333f4894"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d7f1cf5be33ef0175a4e8ed8687aeb98fb00a851"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux Kernel: Information Disclosure via fanotify Use-After-Free", "id": "2532299", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532299"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's fanotify subsystem. This use-after-free vulnerability occurs when the system attempts to report file range information after the memory holding that information has been released. A local attacker could potentially exploit this to read stale stack memory, leading to information disclosure or system instability."], "name": "CVE-2026-89600", "public_date": "2026-09-11T19:45:03Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89600\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89600\nhttps://git.kernel.org/stable/c/66aa9a9e6481bfa512ee5b6380eaaec455a954d2\nhttps://git.kernel.org/stable/c/b8f73b163b646bc56d4dce9c697a578e333f4894\nhttps://git.kernel.org/stable/c/d7f1cf5be33ef0175a4e8ed8687aeb98fb00a851"], "threat_severity": "Moderate"}

{"created": "2026-09-12T06:45:10.802009+00:00", "updated": "2026-09-12T11:15:13.369069+00:00", "vendors": []}