{
  "threat_severity" : "Moderate",
  "public_date" : "2025-09-16T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: sctp: check send stream number after wait_for_sndbuf",
    "id" : "2395682",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2395682"
  },
  "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" : "verified"
  },
  "cwe" : "CWE-476",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nsctp: check send stream number after wait_for_sndbuf\nThis patch fixes a corner case where the asoc out stream count may change\nafter wait_for_sndbuf.\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.\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:\nKASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]\nCall Trace:\n<TASK>\nsctp_cmd_send_msg net/sctp/sm_sideeffect.c:1114 [inline]\nsctp_cmd_interpreter net/sctp/sm_sideeffect.c:1777 [inline]\nsctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline]\nsctp_do_sm+0x197d/0x5310 net/sctp/sm_sideeffect.c:1170\nsctp_primitive_SEND+0x9f/0xc0 net/sctp/primitive.c:163\nsctp_sendmsg_to_asoc+0x10eb/0x1a30 net/sctp/socket.c:1868\nsctp_sendmsg+0x8d4/0x1d90 net/sctp/socket.c:2026\ninet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:825\nsock_sendmsg_nosec net/socket.c:722 [inline]\nsock_sendmsg+0xde/0x190 net/socket.c:745\nThe fix is to add an unlikely check for the send stream number after the\nthread wakes up from the wait_for_sndbuf." ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2023-11-14T00:00:00Z",
    "advisory" : "RHSA-2023:7077",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "kernel-0:4.18.0-513.5.1.el8_9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Extended Update Support",
    "release_date" : "2024-01-30T00:00:00Z",
    "advisory" : "RHSA-2024:0575",
    "cpe" : "cpe:/o:redhat:rhel_eus:8.8",
    "package" : "kernel-0:4.18.0-477.43.1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2023-11-07T00:00:00Z",
    "advisory" : "RHSA-2023:6583",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-362.8.1.el9_3"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2023-11-07T00:00:00Z",
    "advisory" : "RHSA-2023:6583",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-362.8.1.el9_3"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "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" ],
  "name" : "CVE-2023-53296",
  "csaw" : false
}