CVE-2026-53361

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It is not reachable directly from network packets.\nAC:L - Although this is a race, the attacker can control the relevant operations by creating AF_UNIX FD cycles, issuing concurrent GC-triggering sends, peeking, and closing sockets. No victim timing or external condition is required beyond scheduler interleaving.\nPR:L - The path is available to an unprivileged local user through ordinary AF_UNIX sockets and SCM_RIGHTS; there is no capability check for socket creation, FD passing, or MSG_PEEK. It still requires local code execution, so privileges are Low rather than None.\nUI:N - No victim interaction is required once the local attacker can run code. The attacker can create the sockets, pass FDs, trigger GC, and race MSG_PEEK independently.\nS:U - The impact remains within the kernel/local IPC security authority. This is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:N - The bug causes stale GC liveness decisions and purging of live AF_UNIX receive queues, but I did not find a new arbitrary read or unintended disclosure primitive. MSG_PEEK-visible descriptors are already exposed to the receiving endpoint by design.\nI:H - The race can make GC incorrectly collect a live AF_UNIX SCC and purge live receive queues, dropping queued data and SCM_RIGHTS file descriptors. That is unauthorized corruption/destruction of kernel-maintained IPC state, so integrity impact is High.\nA:H - The attacker can repeatedly cause live AF_UNIX sockets to lose queued messages and passed FDs, breaking IPC semantics and potentially denying service to affected local components. Under the required higher-severity rule, this supports High availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/unix/garbage.c"], "versions": [{"version": "ceb8bd6c69c1680fd9b45e7f16d7170c9c7513a5", "lessThan": "20aa894d475bd8086b25c1113ec4ca70f70c7a98", "status": "affected", "versionType": "git"}, {"version": "328840c93bd6a4871dd10908d01b41eab83eb8e2", "lessThan": "82c17e13d404f686e164590483fd6c1abaa675d0", "status": "affected", "versionType": "git"}, {"version": "8b90a9f819dc2a06baae4ec1a64d875e53b824ec", "lessThan": "591f1ac217428a6d2b32a8ac14aac0fab44f155a", "status": "affected", "versionType": "git"}, {"version": "8b90a9f819dc2a06baae4ec1a64d875e53b824ec", "lessThan": "0cfa78c050662784fc8e3ab26dbfd1dc632b2082", "status": "affected", "versionType": "git"}, {"version": "8b90a9f819dc2a06baae4ec1a64d875e53b824ec", "lessThan": "d82ba05263c69fa2437fe93e4e561cc40f4c03af", "status": "affected", "versionType": "git"}, {"version": "6.1.141", "lessThan": "6.1.183", "status": "affected", "versionType": "semver"}, {"version": "6.6.93", "lessThan": "6.6.144", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/unix/garbage.c"], "versions": [{"version": "6.9", "status": "affected"}, {"version": "0", "lessThan": "6.9", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.144", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.95", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.38", "lessThanOrEqual": "6.18.*", "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": "6.1.141", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.93", "versionEndExcluding": "6.6.144"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.12.95"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.18.38"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/20aa894d475bd8086b25c1113ec4ca70f70c7a98"}, {"url": "https://git.kernel.org/stable/c/82c17e13d404f686e164590483fd6c1abaa675d0"}, {"url": "https://git.kernel.org/stable/c/591f1ac217428a6d2b32a8ac14aac0fab44f155a"}, {"url": "https://git.kernel.org/stable/c/0cfa78c050662784fc8e3ab26dbfd1dc632b2082"}, {"url": "https://git.kernel.org/stable/c/d82ba05263c69fa2437fe93e4e561cc40f4c03af"}], "title": "af_unix: Set gc_in_progress to true in unix_gc().", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-53361", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:29:15.887746Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-362", "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:07:44.591Z"}}]}}

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gc_in_progress = true |\n `- queue_work() |\n unix_gc() <----------------/ |\n | |- gc_in_progress = true\n ... `- queue_work()\n | |\n `- gc_in_progress = false |\n |\n unix_gc() <---------------------------------------------'\n |\n ... /* gc_in_progress == false */\n |\n `- gc_in_progress = false\n\nunix_peek_fpl() relies on gc_in_progress not to confuse GC\nby MSG_PEEK.\n\nLet's set gc_in_progress to true in unix_gc()."}], "id": "CVE-2026-53361", "lastModified": "2026-10-19T20:19:16.340", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "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-2026-53361", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:29:15.887746Z", "version": "2.0.3"}}]}, "published": "2026-07-04T12:17:02.010", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0cfa78c050662784fc8e3ab26dbfd1dc632b2082"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/20aa894d475bd8086b25c1113ec4ca70f70c7a98"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/591f1ac217428a6d2b32a8ac14aac0fab44f155a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/82c17e13d404f686e164590483fd6c1abaa675d0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d82ba05263c69fa2437fe93e4e561cc40f4c03af"}], "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-362"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: af_unix: Set gc_in_progress to true in unix_gc()", "id": "2497035", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2497035"}, "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-366", "details": ["In the Linux kernel, the following vulnerability has been resolved:\naf_unix: Set gc_in_progress to true in unix_gc().\nIgor Ushakov reported that unix_gc() could run with gc_in_progress\nbeing false if the work is scheduled while running:\nThread 1 Thread 2 Thread 3\n-------- -------- --------\nunix_schedule_gc() unix_schedule_gc()\n`- if (!gc_in_progress) `- if (!gc_in_progress)\n|- gc_in_progress = true |\n`- queue_work() |\nunix_gc() <----------------/ |\n| |- gc_in_progress = true\n... `- queue_work()\n| |\n`- gc_in_progress = false |\n|\nunix_gc() <---------------------------------------------'\n|\n... /* gc_in_progress == false */\n|\n`- gc_in_progress = false\nunix_peek_fpl() relies on gc_in_progress not to confuse GC\nby MSG_PEEK.\nLet's set gc_in_progress to true in unix_gc().", "A flaw was found in the Linux kernel's `af_unix` component. A race condition exists within the `unix_gc()` garbage collection function where the `gc_in_progress` flag may not be correctly set. This could lead to `unix_peek_fpl()` misinterpreting garbage collection status when handling `MSG_PEEK` operations, potentially causing unexpected behavior or information disclosure to a local attacker."], "name": "CVE-2026-53361", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53361\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53361\nhttps://lore.kernel.org/linux-cve-announce/2026070436-CVE-2026-53361-f969@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[328840c93bd6a4871dd10908d01b41eab83eb8e2,82c17e13d404f686e164590483fd6c1abaa675d0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8b90a9f819dc2a06baae4ec1a64d875e53b824ec,591f1ac217428a6d2b32a8ac14aac0fab44f155a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8b90a9f819dc2a06baae4ec1a64d875e53b824ec,0cfa78c050662784fc8e3ab26dbfd1dc632b2082)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8b90a9f819dc2a06baae4ec1a64d875e53b824ec,d82ba05263c69fa2437fe93e4e561cc40f4c03af)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ceb8bd6c69c1680fd9b45e7f16d7170c9c7513a5,*]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.93,6.6.144)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.141,6.2)"}}], "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": "[6.9,*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.9)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "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": "2026-07-04T13:30:16.245189+00:00", "updated": "2026-10-20T14:15:14.443500+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}