{
  "threat_severity" : "Moderate",
  "public_date" : "2025-09-15T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: af_unix: Fix data-races around user->unix_inflight",
    "id" : "2395332",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2395332"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.3",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-366",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\naf_unix: Fix data-races around user->unix_inflight.\nuser->unix_inflight is changed under spin_lock(unix_gc_lock),\nbut too_many_unix_fds() reads it locklessly.\nLet's annotate the write/read accesses to user->unix_inflight.\nBUG: KCSAN: data-race in unix_attach_fds / unix_inflight\nwrite to 0xffffffff8546f2d0 of 8 bytes by task 44798 on cpu 1:\nunix_inflight+0x157/0x180 net/unix/scm.c:66\nunix_attach_fds+0x147/0x1e0 net/unix/scm.c:123\nunix_scm_to_skb net/unix/af_unix.c:1827 [inline]\nunix_dgram_sendmsg+0x46a/0x14f0 net/unix/af_unix.c:1950\nunix_seqpacket_sendmsg net/unix/af_unix.c:2308 [inline]\nunix_seqpacket_sendmsg+0xba/0x130 net/unix/af_unix.c:2292\nsock_sendmsg_nosec net/socket.c:725 [inline]\nsock_sendmsg+0x148/0x160 net/socket.c:748\n____sys_sendmsg+0x4e4/0x610 net/socket.c:2494\n___sys_sendmsg+0xc6/0x140 net/socket.c:2548\n__sys_sendmsg+0x94/0x140 net/socket.c:2577\n__do_sys_sendmsg net/socket.c:2586 [inline]\n__se_sys_sendmsg net/socket.c:2584 [inline]\n__x64_sys_sendmsg+0x45/0x50 net/socket.c:2584\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x6e/0xd8\nread to 0xffffffff8546f2d0 of 8 bytes by task 44814 on cpu 0:\ntoo_many_unix_fds net/unix/scm.c:101 [inline]\nunix_attach_fds+0x54/0x1e0 net/unix/scm.c:110\nunix_scm_to_skb net/unix/af_unix.c:1827 [inline]\nunix_dgram_sendmsg+0x46a/0x14f0 net/unix/af_unix.c:1950\nunix_seqpacket_sendmsg net/unix/af_unix.c:2308 [inline]\nunix_seqpacket_sendmsg+0xba/0x130 net/unix/af_unix.c:2292\nsock_sendmsg_nosec net/socket.c:725 [inline]\nsock_sendmsg+0x148/0x160 net/socket.c:748\n____sys_sendmsg+0x4e4/0x610 net/socket.c:2494\n___sys_sendmsg+0xc6/0x140 net/socket.c:2548\n__sys_sendmsg+0x94/0x140 net/socket.c:2577\n__do_sys_sendmsg net/socket.c:2586 [inline]\n__se_sys_sendmsg net/socket.c:2584 [inline]\n__x64_sys_sendmsg+0x45/0x50 net/socket.c:2584\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x6e/0xd8\nvalue changed: 0x000000000000000c -> 0x000000000000000d\nReported by Kernel Concurrency Sanitizer on:\nCPU: 0 PID: 44814 Comm: systemd-coredum Not tainted 6.4.0-11989-g6843306689af #6\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014" ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2024-04-30T00:00:00Z",
    "advisory" : "RHSA-2024:2394",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-427.13.1.el9_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2024-04-30T00:00:00Z",
    "advisory" : "RHSA-2024:2394",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-427.13.1.el9_4"
  } ],
  "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" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Fix deferred",
    "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-2023-53204\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53204\nhttps://lore.kernel.org/linux-cve-announce/2025091509-CVE-2023-53204-3e15@gregkh/T" ],
  "name" : "CVE-2023-53204",
  "csaw" : false
}