CVE-2026-53004

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The check is missing the sizeof(struct\nsctp_authchunks) = 8-byte header. When the caller supplies\nlen == num_chunks (for any num_chunks > 0) the test passes but\ncopy_to_user() writes sizeof(struct sctp_authchunks) = 8 bytes\npast the declared buffer.\n\nThe sibling function sctp_getsockopt_local_auth_chunks() at the\nnext line already has the correct check:\n\n if (len < sizeof(struct sctp_authchunks) + num_chunks)\n return -EINVAL;\n\nAlign the peer variant with its sibling.\n\nReproducer confirms on v7.0-13-generic: an unprivileged userspace\ncaller that opens a loopback SCTP association with AUTH enabled,\nqueries num_chunks with a short optval, then issues the real\ngetsockopt with len == num_chunks and sentinel bytes painted past\nthe buffer observes those sentinel bytes overwritten with the\npeer's AUTH chunk type. The bytes written are under the peer's\ncontrol but land in the caller's own userspace; this is not a\nkernel memory corruption, but it is a kernel-side contract\nviolation that can silently corrupt adjacent userspace data."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sctp/socket.c"], "versions": [{"version": "65b07e5d0d09c77e98050b5f0146ead29e5add32", "lessThan": "a132e199de69e2a45628aa8534df1bf5d44e1b6e", "status": "affected", "versionType": "git"}, {"version": "65b07e5d0d09c77e98050b5f0146ead29e5add32", "lessThan": "2b5a2c957c7769d40110f725cf23987fcef50d75", "status": "affected", "versionType": "git"}, {"version": "65b07e5d0d09c77e98050b5f0146ead29e5add32", "lessThan": "d45c7e99caf915b0f6c716bd8ffe9d45b9685761", "status": "affected", "versionType": "git"}, {"version": "65b07e5d0d09c77e98050b5f0146ead29e5add32", "lessThan": 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The check is missing the sizeof(struct\nsctp_authchunks) = 8-byte header. When the caller supplies\nlen == num_chunks (for any num_chunks > 0) the test passes but\ncopy_to_user() writes sizeof(struct sctp_authchunks) = 8 bytes\npast the declared buffer.\n\nThe sibling function sctp_getsockopt_local_auth_chunks() at the\nnext line already has the correct check:\n\n if (len < sizeof(struct sctp_authchunks) + num_chunks)\n return -EINVAL;\n\nAlign the peer variant with its sibling.\n\nReproducer confirms on v7.0-13-generic: an unprivileged userspace\ncaller that opens a loopback SCTP association with AUTH enabled,\nqueries num_chunks with a short optval, then issues the real\ngetsockopt with len == num_chunks and sentinel bytes painted past\nthe buffer observes those sentinel bytes overwritten with the\npeer's AUTH chunk type. The bytes written are under the peer's\ncontrol but land in the caller's own userspace; this is not a\nkernel memory corruption, but it is a kernel-side contract\nviolation that can silently corrupt adjacent userspace data."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.258", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.209", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.175", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.141", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.91", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.33", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.10", "versionStartIncluding": "2.6.24"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "2.6.24"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-06-24T16:29:16.151Z"}}}, "cveMetadata": {"cveId": "CVE-2026-53004", "state": "PUBLISHED", "dateUpdated": "2026-11-06T16:23:53.430Z", "dateReserved": "2026-06-09T07:44:35.377Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-06-24T16:29:16.151Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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The check is missing the sizeof(struct\nsctp_authchunks) = 8-byte header. When the caller supplies\nlen == num_chunks (for any num_chunks > 0) the test passes but\ncopy_to_user() writes sizeof(struct sctp_authchunks) = 8 bytes\npast the declared buffer.\n\nThe sibling function sctp_getsockopt_local_auth_chunks() at the\nnext line already has the correct check:\n\n if (len < sizeof(struct sctp_authchunks) + num_chunks)\n return -EINVAL;\n\nAlign the peer variant with its sibling.\n\nReproducer confirms on v7.0-13-generic: an unprivileged userspace\ncaller that opens a loopback SCTP association with AUTH enabled,\nqueries num_chunks with a short optval, then issues the real\ngetsockopt with len == num_chunks and sentinel bytes painted past\nthe buffer observes those sentinel bytes overwritten with the\npeer's AUTH chunk type. The bytes written are under the peer's\ncontrol but land in the caller's own userspace; this is not a\nkernel memory corruption, but it is a kernel-side contract\nviolation that can silently corrupt adjacent userspace data."}], "id": "CVE-2026-53004", "lastModified": "2026-11-06T17:18:00.690", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "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:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53004", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:16:10.340017Z", "version": "2.0.3"}}]}, "published": "2026-06-24T17:17:11.510", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0cf004ffb61cd32d140531c3a84afe975f9fc7ea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2b5a2c957c7769d40110f725cf23987fcef50d75"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6849b995cda88a677bf08a05765d1db7905974fc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6bcf8fe4ef7967b22b814cbae9a57bbd3c853410"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/70a089cc9590aa347a61e84434116ab74619e3c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a132e199de69e2a45628aa8534df1bf5d44e1b6e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d45c7e99caf915b0f6c716bd8ffe9d45b9685761"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d67fbc6dea5dbf7f46c618ebf65910a276078e20"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: sctp: fix OOB write to userspace in sctp_getsockopt_peer_auth_chunks", "id": "2492315", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492315"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-131", "details": ["A flaw was found in the Linux kernel's Stream Control Transmission Protocol (SCTP) implementation. An unprivileged local user could exploit an out-of-bounds write vulnerability in the `sctp_getsockopt_peer_auth_chunks` function. This occurs due to an incorrect size check, allowing the kernel to write past the intended buffer in userspace. This flaw can lead to the silent corruption of adjacent userspace data, impacting data integrity."], "name": "CVE-2026-53004", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53004\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53004\nhttps://lore.kernel.org/linux-cve-announce/2026062448-CVE-2026-53004-09a9@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[65b07e5d0d09c77e98050b5f0146ead29e5add32,a132e199de69e2a45628aa8534df1bf5d44e1b6e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[65b07e5d0d09c77e98050b5f0146ead29e5add32,2b5a2c957c7769d40110f725cf23987fcef50d75)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[65b07e5d0d09c77e98050b5f0146ead29e5add32,d45c7e99caf915b0f6c716bd8ffe9d45b9685761)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[65b07e5d0d09c77e98050b5f0146ead29e5add32,d67fbc6dea5dbf7f46c618ebf65910a276078e20)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[65b07e5d0d09c77e98050b5f0146ead29e5add32,6849b995cda88a677bf08a05765d1db7905974fc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[65b07e5d0d09c77e98050b5f0146ead29e5add32,70a089cc9590aa347a61e84434116ab74619e3c3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[65b07e5d0d09c77e98050b5f0146ead29e5add32,6bcf8fe4ef7967b22b814cbae9a57bbd3c853410)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[65b07e5d0d09c77e98050b5f0146ead29e5add32,0cf004ffb61cd32d140531c3a84afe975f9fc7ea)"}}], "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": "semver", "value": "2.6.24"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.24)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.258,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.209,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.175,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.141,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.91,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.10,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "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": "2026-06-24T21:00:11.772688+00:00", "updated": "2026-08-12T06:45:04.794605+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}