CVE-2023-53296

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The crash\noccurs when the thread waiting for sndbuf is awake and sends the msg in a\nnon-existing stream(N - 1), the call trace is as below:\n\n KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]\n Call Trace:\n <TASK>\n sctp_cmd_send_msg net/sctp/sm_sideeffect.c:1114 [inline]\n sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1777 [inline]\n sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline]\n sctp_do_sm+0x197d/0x5310 net/sctp/sm_sideeffect.c:1170\n sctp_primitive_SEND+0x9f/0xc0 net/sctp/primitive.c:163\n sctp_sendmsg_to_asoc+0x10eb/0x1a30 net/sctp/socket.c:1868\n sctp_sendmsg+0x8d4/0x1d90 net/sctp/socket.c:2026\n inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:825\n sock_sendmsg_nosec net/socket.c:722 [inline]\n sock_sendmsg+0xde/0x190 net/socket.c:745\n\nThe fix is to add an unlikely check for the send stream number after the\nthread wakes up from the wait_for_sndbuf."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": 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"https://git.kernel.org/stable/c/2584024b23552c00d95b50255e47bd18d306d31a"}], "title": "sctp: check send stream number after wait_for_sndbuf", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2023-53296", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-01-14T18:12:16.722971Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-476", "description": "CWE-476 NULL Pointer Dereference"}]}], "title": "CISA ADP Vulnrichment", 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The crash\noccurs when the thread waiting for sndbuf is awake and sends the msg in a\nnon-existing stream(N - 1), the call trace is as below:\n\n KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]\n Call Trace:\n <TASK>\n sctp_cmd_send_msg net/sctp/sm_sideeffect.c:1114 [inline]\n sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1777 [inline]\n sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline]\n sctp_do_sm+0x197d/0x5310 net/sctp/sm_sideeffect.c:1170\n sctp_primitive_SEND+0x9f/0xc0 net/sctp/primitive.c:163\n sctp_sendmsg_to_asoc+0x10eb/0x1a30 net/sctp/socket.c:1868\n sctp_sendmsg+0x8d4/0x1d90 net/sctp/socket.c:2026\n inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:825\n sock_sendmsg_nosec net/socket.c:722 [inline]\n sock_sendmsg+0xde/0x190 net/socket.c:745\n\nThe fix is to add an unlikely check for the send stream number after the\nthread wakes up from the wait_for_sndbuf."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.19.281", "versionStartIncluding": "4.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.241", "versionStartIncluding": "4.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.178", "versionStartIncluding": "4.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.107", "versionStartIncluding": "4.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.24", "versionStartIncluding": "4.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.2.11", "versionStartIncluding": "4.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.3", "versionStartIncluding": "4.15"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:42:12.034Z"}}}, "cveMetadata": {"cveId": "CVE-2023-53296", "state": "PUBLISHED", "dateUpdated": "2026-05-11T19:42:12.034Z", "dateReserved": "2025-09-16T08:09:37.993Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-09-16T08:11:28.519Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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2,\nanother thread in the client keeps sending the msgs with stream number\nN - 1, and waits for sndbuf before processing INIT_ACK.\n\nHowever, after processing INIT_ACK, the out stream count in the client is\nshrunk to N - 2, the same to the in stream count in the server. The crash\noccurs when the thread waiting for sndbuf is awake and sends the msg in a\nnon-existing stream(N - 1), the call trace is as below:\n\n KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]\n Call Trace:\n <TASK>\n sctp_cmd_send_msg net/sctp/sm_sideeffect.c:1114 [inline]\n sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1777 [inline]\n sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline]\n sctp_do_sm+0x197d/0x5310 net/sctp/sm_sideeffect.c:1170\n sctp_primitive_SEND+0x9f/0xc0 net/sctp/primitive.c:163\n sctp_sendmsg_to_asoc+0x10eb/0x1a30 net/sctp/socket.c:1868\n sctp_sendmsg+0x8d4/0x1d90 net/sctp/socket.c:2026\n inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:825\n sock_sendmsg_nosec net/socket.c:722 [inline]\n sock_sendmsg+0xde/0x190 net/socket.c:745\n\nThe fix is to add an unlikely check for the send stream number after the\nthread wakes up from the wait_for_sndbuf."}], "id": "CVE-2023-53296", "lastModified": "2026-06-17T06:44:46.340", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-53296", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-14T18:12:16.722971Z", "version": "2.0.3"}}]}, "published": "2025-09-16T08:15:38.937", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0443fff49d6352160c200064156c25898bd9f58c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2584024b23552c00d95b50255e47bd18d306d31a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/667eb99cf7c15fe5b0ecefe75cf658e20ef20c9f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9346a1a21142357972a6f466ba6275ddc54b04ac"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a615e7270318fa0b98bf1ff38daf6cf52d840312"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b4b6dfad41aaae9e36e44327b18d5cf4b20dd2ce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d2128636b303aa9cf065055402ee6697409a8837"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-476"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: sctp: check send stream number after wait_for_sndbuf", "id": "2395682", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2395682"}, "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"}, "details": ["No description is available for this CVE."], "name": "CVE-2023-53296", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "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": "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": "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": "2025-09-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-53296\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53296\nhttps://lore.kernel.org/linux-cve-announce/2025091627-CVE-2023-53296-9947@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-09-17T10:05:03.730555+00:00", "updated": "2025-09-17T10:05:03.730588+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}