{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46150", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.101Z", "datePublished": "2026-05-28T09:36:06.494Z", "dateUpdated": "2026-08-05T12:30:03.577Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:30:03.577Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfanotify: fix false positive on permission events\n\nfsnotify_get_mark_safe() may return false for a mark on an unrelated group,\nwhich results in bypassing the permission check.\n\nFix by skipping over detached marks that are not in the current group." } ], "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:N", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable code runs in the context of a local file operation (open/read/exec) that triggers the fanotify permission event; the attacker bypasses the control by performing local file ops plus churning a local inotify watch. The fully-controllable, reliable attack is local (a remote file-server scenario would lose attacker control of the race).\nAC:L - The attacker controls both sides of the race — the lifecycle of the unrelated (unprivileged inotify) mark and the retried file operation — and each open() is a fresh permission event, so with unlimited retries the bypass is reliably reachable.\nPR:L - Exploitation only needs an unprivileged local account: creating an inotify watch on the parent directory and opening/executing the target file require no capabilities (the privileged CAP_SYS_ADMIN fanotify group is the victim control, not the attacker).\nUI:N - The attacker performs all actions (inotify churn plus repeated file access) with no interaction from any other user.\nS:U - The flaw and its impact are both mediated entirely within the kernel's own access-control path; no boundary to a separately-managed security authority (VM, IOMMU) is crossed.\nC:H - Bypassing FAN_ACCESS_PERM/FAN_OPEN_PERM lets read access to files the policy (AV/sandbox/EDR) would deny proceed; via targeted retries the attacker can force disclosure of chosen protected files, approaching total loss of confidentiality of protected resources.\nI:H - Bypassing FAN_OPEN_PERM/FAN_OPEN_EXEC_PERM lets writes to protected files and execution of binaries the policy would block proceed, allowing modification of protected resources and execution of disallowed code.\nA:N - The bug is fail-open (it only allows operations that should be blocked); it causes no crash, hang, or resource exhaustion, so availability is unaffected." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/notify/fsnotify.c", "fs/notify/mark.c", "include/linux/fsnotify_backend.h" ], "versions": [ { "version": "abc77577a669f424c5d0c185b9994f2621c52aa4", "lessThan": "a24765332e129c1916d5a6615418b75599b8fcdc", "status": "affected", "versionType": "git" }, { "version": "abc77577a669f424c5d0c185b9994f2621c52aa4", "lessThan": "4a7611ad653785fcdea5ff5f4441e2b7d05b7f11", "status": "affected", "versionType": "git" }, { "version": "abc77577a669f424c5d0c185b9994f2621c52aa4", "lessThan": "04bb66be92f48ed13c3faf1139d892df228789bc", "status": "affected", "versionType": "git" }, { "version": "abc77577a669f424c5d0c185b9994f2621c52aa4", "lessThan": "895ebbedf88318607c24acc0f591c74b165e1d0a", "status": "affected", "versionType": "git" }, { "version": "abc77577a669f424c5d0c185b9994f2621c52aa4", "lessThan": "f130790f1acc8399f32652846c875a251efd040f", "status": "affected", "versionType": "git" }, { "version": "abc77577a669f424c5d0c185b9994f2621c52aa4", "lessThan": "7baa02b0ae9d17ec5f08836d8ea88ce1927d0678", "status": "affected", "versionType": "git" }, { "version": "abc77577a669f424c5d0c185b9994f2621c52aa4", "lessThan": "b7b24b28c8cd55844cab908f4f39dded638d5538", "status": "affected", "versionType": "git" }, { "version": "abc77577a669f424c5d0c185b9994f2621c52aa4", "lessThan": "7746e3bd4cc19b5092e00d32d676e329bfcb6900", "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/fsnotify.c", "fs/notify/mark.c", "include/linux/fsnotify_backend.h" ], "versions": [ { "version": "4.12", "status": "affected" }, { "version": "0", "lessThan": "4.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.88", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.30", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.7", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.6.140" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.12.88" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.18.30" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "7.0.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a24765332e129c1916d5a6615418b75599b8fcdc" }, { "url": "https://git.kernel.org/stable/c/4a7611ad653785fcdea5ff5f4441e2b7d05b7f11" }, { "url": "https://git.kernel.org/stable/c/04bb66be92f48ed13c3faf1139d892df228789bc" }, { "url": "https://git.kernel.org/stable/c/895ebbedf88318607c24acc0f591c74b165e1d0a" }, { "url": "https://git.kernel.org/stable/c/f130790f1acc8399f32652846c875a251efd040f" }, { "url": "https://git.kernel.org/stable/c/7baa02b0ae9d17ec5f08836d8ea88ce1927d0678" }, { "url": "https://git.kernel.org/stable/c/b7b24b28c8cd55844cab908f4f39dded638d5538" }, { "url": "https://git.kernel.org/stable/c/7746e3bd4cc19b5092e00d32d676e329bfcb6900" } ], "title": "fanotify: fix false positive on permission events", "x_generator": { "engine": "bippy-1.2.0" } } } }