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CVE-2023-53296 (GCVE-0-2023-53296)

Vulnerability from cvelistv5 – Published: 2025-09-16 08:11 – Updated: 2026-05-11 19:42
VLAI
Title
sctp: check send stream number after wait_for_sndbuf
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: check send stream number after wait_for_sndbuf This patch fixes a corner case where the asoc out stream count may change after wait_for_sndbuf. When the main thread in the client starts a connection, if its out stream count is set to N while the in stream count in the server is set to N - 2, another thread in the client keeps sending the msgs with stream number N - 1, and waits for sndbuf before processing INIT_ACK. However, after processing INIT_ACK, the out stream count in the client is shrunk to N - 2, the same to the in stream count in the server. The crash occurs when the thread waiting for sndbuf is awake and sends the msg in a non-existing stream(N - 1), the call trace is as below: KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f] Call Trace: <TASK> sctp_cmd_send_msg net/sctp/sm_sideeffect.c:1114 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1777 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] sctp_do_sm+0x197d/0x5310 net/sctp/sm_sideeffect.c:1170 sctp_primitive_SEND+0x9f/0xc0 net/sctp/primitive.c:163 sctp_sendmsg_to_asoc+0x10eb/0x1a30 net/sctp/socket.c:1868 sctp_sendmsg+0x8d4/0x1d90 net/sctp/socket.c:2026 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:825 sock_sendmsg_nosec net/socket.c:722 [inline] sock_sendmsg+0xde/0x190 net/socket.c:745 The fix is to add an unlikely check for the send stream number after the thread wakes up from the wait_for_sndbuf.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 18:12 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 , < 9346a1a21142357972a6f466ba6275ddc54b04ac (git)
Affected: 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 , < 0443fff49d6352160c200064156c25898bd9f58c (git)
Affected: 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 , < b4b6dfad41aaae9e36e44327b18d5cf4b20dd2ce (git)
Affected: 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 , < 667eb99cf7c15fe5b0ecefe75cf658e20ef20c9f (git)
Affected: 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 , < d2128636b303aa9cf065055402ee6697409a8837 (git)
Affected: 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 , < a615e7270318fa0b98bf1ff38daf6cf52d840312 (git)
Affected: 5bbbbe32a43199c2b9ea5ea66fab6241c64beb51 , < 2584024b23552c00d95b50255e47bd18d306d31a (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 4.19.281 , ≤ 4.19.* (semver)
Unaffected: 5.4.241 , ≤ 5.4.* (semver)
Unaffected: 5.10.178 , ≤ 5.10.* (semver)
Unaffected: 5.15.107 , ≤ 5.15.* (semver)
Unaffected: 6.1.24 , ≤ 6.1.* (semver)
Unaffected: 6.2.11 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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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   \u003cTASK\u003e\\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 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-21T18:52:32+00:00",
      "cve": "CVE-2023-53296",
      "id": "CVE-2023-53296",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "240",
      "product_status:known_affected": "166",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sctp: check send stream number after wait_for_sndbuf",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53296.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"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\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-14T18:12:10.843Z\"}}], \"cna\": {\"title\": \"sctp: check send stream number after wait_for_sndbuf\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5bbbbe32a43199c2b9ea5ea66fab6241c64beb51\", \"lessThan\": \"9346a1a21142357972a6f466ba6275ddc54b04ac\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5bbbbe32a43199c2b9ea5ea66fab6241c64beb51\", \"lessThan\": \"0443fff49d6352160c200064156c25898bd9f58c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5bbbbe32a43199c2b9ea5ea66fab6241c64beb51\", \"lessThan\": \"b4b6dfad41aaae9e36e44327b18d5cf4b20dd2ce\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5bbbbe32a43199c2b9ea5ea66fab6241c64beb51\", \"lessThan\": \"667eb99cf7c15fe5b0ecefe75cf658e20ef20c9f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5bbbbe32a43199c2b9ea5ea66fab6241c64beb51\", \"lessThan\": \"d2128636b303aa9cf065055402ee6697409a8837\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5bbbbe32a43199c2b9ea5ea66fab6241c64beb51\", \"lessThan\": \"a615e7270318fa0b98bf1ff38daf6cf52d840312\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5bbbbe32a43199c2b9ea5ea66fab6241c64beb51\", \"lessThan\": \"2584024b23552c00d95b50255e47bd18d306d31a\", \"versionType\": \"git\"}], \"programFiles\": [\"net/sctp/socket.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.15\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.15\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.281\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.241\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.178\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.107\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.24\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.2.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.2.*\"}, {\"status\": \"unaffected\", \"version\": \"6.3\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/sctp/socket.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/9346a1a21142357972a6f466ba6275ddc54b04ac\"}, {\"url\": \"https://git.kernel.org/stable/c/0443fff49d6352160c200064156c25898bd9f58c\"}, {\"url\": \"https://git.kernel.org/stable/c/b4b6dfad41aaae9e36e44327b18d5cf4b20dd2ce\"}, {\"url\": \"https://git.kernel.org/stable/c/667eb99cf7c15fe5b0ecefe75cf658e20ef20c9f\"}, {\"url\": \"https://git.kernel.org/stable/c/d2128636b303aa9cf065055402ee6697409a8837\"}, {\"url\": \"https://git.kernel.org/stable/c/a615e7270318fa0b98bf1ff38daf6cf52d840312\"}, {\"url\": \"https://git.kernel.org/stable/c/2584024b23552c00d95b50255e47bd18d306d31a\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsctp: check send stream number after wait_for_sndbuf\\n\\nThis patch fixes a corner case where the asoc out stream count may change\\nafter wait_for_sndbuf.\\n\\nWhen the main thread in the client starts a connection, if its out stream\\ncount is set to N while the in stream count in the server is set to N - 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   \u003cTASK\u003e\\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\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.