CVE-2026-46150

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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 \u2014 the lifecycle of the unrelated (unprivileged inotify) mark and the retried file operation \u2014 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": 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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 \u2014 the lifecycle of the unrelated (unprivileged inotify) mark and the retried file operation \u2014 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": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "abc77577a669f424c5d0c185b9994f2621c52aa4", "lessThan": "a24765332e129c1916d5a6615418b75599b8fcdc", "versionType": "git"}, {"status": "affected", "version": "abc77577a669f424c5d0c185b9994f2621c52aa4", "lessThan": 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GNU/Linux subsystem", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7FED9066-C252-4AA0-A5D6-7FDDC40E11A6", "versionEndExcluding": "5.10.258", "versionStartIncluding": "4.12", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "919C10A9-7951-4A74-BADD-C135A0A8D8B4", "versionEndExcluding": "5.15.209", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "92385813-D91D-480D-83A1-F423D2CBB2BA", "versionEndExcluding": "6.1.175", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A1A92866-F406-43B5-B2D1-CFC274753E9D", "versionEndExcluding": "6.6.140", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "5AFBE0EC-CCDF-4207-AE92-ABF958125CA4", "versionEndExcluding": "6.12.88", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "BF39AE08-AE6D-4410-8FBE-76F6BF5BF55B", "versionEndExcluding": "6.18.30", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D0893CA7-9AE6-4DFE-AC75-48967D73AD8E", "versionEndExcluding": "7.0.7", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}], "id": "CVE-2026-46150", "lastModified": "2026-10-19T20:18:35.280", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46150", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:20:28.641291Z", "version": "2.0.3"}}]}, "published": "2026-05-28T10:16:30.630", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/04bb66be92f48ed13c3faf1139d892df228789bc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4a7611ad653785fcdea5ff5f4441e2b7d05b7f11"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7746e3bd4cc19b5092e00d32d676e329bfcb6900"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7baa02b0ae9d17ec5f08836d8ea88ce1927d0678"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/895ebbedf88318607c24acc0f591c74b165e1d0a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a24765332e129c1916d5a6615418b75599b8fcdc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b7b24b28c8cd55844cab908f4f39dded638d5538"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f130790f1acc8399f32652846c875a251efd040f"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-863"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: fanotify: fix false positive on permission events", "id": "2482612", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482612"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-280", "details": ["A flaw was found in the Linux kernel's fanotify subsystem. This vulnerability allows for a bypass of permission checks because the `fsnotify_get_mark_safe()` function may incorrectly return false for marks on unrelated groups. This could enable an attacker to perform unauthorized actions by circumventing intended security restrictions."], "name": "CVE-2026-46150", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46150\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46150\nhttps://lore.kernel.org/linux-cve-announce/2026052822-CVE-2026-46150-c96d@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[abc77577a669f424c5d0c185b9994f2621c52aa4,895ebbedf88318607c24acc0f591c74b165e1d0a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[abc77577a669f424c5d0c185b9994f2621c52aa4,f130790f1acc8399f32652846c875a251efd040f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[abc77577a669f424c5d0c185b9994f2621c52aa4,7baa02b0ae9d17ec5f08836d8ea88ce1927d0678)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[abc77577a669f424c5d0c185b9994f2621c52aa4,b7b24b28c8cd55844cab908f4f39dded638d5538)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[abc77577a669f424c5d0c185b9994f2621c52aa4,7746e3bd4cc19b5092e00d32d676e329bfcb6900)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.140,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.88,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.30,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.7,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1-rc2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-28T11:45:16.112097+00:00", "updated": "2026-10-20T01:45:07.577526+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-280", "CWE-863"]}