CVE-2023-53204 (GCVE-0-2023-53204)
Vulnerability from cvelistv5 – Published: 2025-09-15 14:21 – Updated: 2026-05-23 15:28
VLAI
EPSS
VEX
Title
af_unix: Fix data-races around user->unix_inflight.
Summary
In the Linux kernel, the following vulnerability has been resolved:
af_unix: Fix data-races around user->unix_inflight.
user->unix_inflight is changed under spin_lock(unix_gc_lock),
but too_many_unix_fds() reads it locklessly.
Let's annotate the write/read accesses to user->unix_inflight.
BUG: KCSAN: data-race in unix_attach_fds / unix_inflight
write to 0xffffffff8546f2d0 of 8 bytes by task 44798 on cpu 1:
unix_inflight+0x157/0x180 net/unix/scm.c:66
unix_attach_fds+0x147/0x1e0 net/unix/scm.c:123
unix_scm_to_skb net/unix/af_unix.c:1827 [inline]
unix_dgram_sendmsg+0x46a/0x14f0 net/unix/af_unix.c:1950
unix_seqpacket_sendmsg net/unix/af_unix.c:2308 [inline]
unix_seqpacket_sendmsg+0xba/0x130 net/unix/af_unix.c:2292
sock_sendmsg_nosec net/socket.c:725 [inline]
sock_sendmsg+0x148/0x160 net/socket.c:748
____sys_sendmsg+0x4e4/0x610 net/socket.c:2494
___sys_sendmsg+0xc6/0x140 net/socket.c:2548
__sys_sendmsg+0x94/0x140 net/socket.c:2577
__do_sys_sendmsg net/socket.c:2586 [inline]
__se_sys_sendmsg net/socket.c:2584 [inline]
__x64_sys_sendmsg+0x45/0x50 net/socket.c:2584
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x6e/0xd8
read to 0xffffffff8546f2d0 of 8 bytes by task 44814 on cpu 0:
too_many_unix_fds net/unix/scm.c:101 [inline]
unix_attach_fds+0x54/0x1e0 net/unix/scm.c:110
unix_scm_to_skb net/unix/af_unix.c:1827 [inline]
unix_dgram_sendmsg+0x46a/0x14f0 net/unix/af_unix.c:1950
unix_seqpacket_sendmsg net/unix/af_unix.c:2308 [inline]
unix_seqpacket_sendmsg+0xba/0x130 net/unix/af_unix.c:2292
sock_sendmsg_nosec net/socket.c:725 [inline]
sock_sendmsg+0x148/0x160 net/socket.c:748
____sys_sendmsg+0x4e4/0x610 net/socket.c:2494
___sys_sendmsg+0xc6/0x140 net/socket.c:2548
__sys_sendmsg+0x94/0x140 net/socket.c:2577
__do_sys_sendmsg net/socket.c:2586 [inline]
__se_sys_sendmsg net/socket.c:2584 [inline]
__x64_sys_sendmsg+0x45/0x50 net/socket.c:2584
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x6e/0xd8
value changed: 0x000000000000000c -> 0x000000000000000d
Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 44814 Comm: systemd-coredum Not tainted 6.4.0-11989-g6843306689af #6
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
Severity
4.7 (Medium)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
712f4aad406bb1ed67f3f98d04c044191f0ff593 , < df97b5ea9f3ac9308c3a633524dab382cd59d9e5
(git)
Affected: 712f4aad406bb1ed67f3f98d04c044191f0ff593 , < 03d133dfbcec9d439729cc64706c7eb6d1663a24 (git) Affected: 712f4aad406bb1ed67f3f98d04c044191f0ff593 , < adcf4e069358cdee8593663650ea447215a1c49e (git) Affected: 712f4aad406bb1ed67f3f98d04c044191f0ff593 , < b401d7e485b0a234cf8fe9a6ae99dbcd20863138 (git) Affected: 712f4aad406bb1ed67f3f98d04c044191f0ff593 , < 9151ed4b006125cba7c06c79df504340ea4e9386 (git) Affected: 712f4aad406bb1ed67f3f98d04c044191f0ff593 , < b9cdbb38e030fc2fe97fe27b54cbb6b4fbff250f (git) Affected: 712f4aad406bb1ed67f3f98d04c044191f0ff593 , < ac92f239a079678a035c0faad9089354a874aede (git) Affected: 712f4aad406bb1ed67f3f98d04c044191f0ff593 , < 0bc36c0650b21df36fbec8136add83936eaf0607 (git) Affected: a5a6cf8c405e826ff7ed1308dde72560c0ed4854 (git) Affected: df87da0783c4492b944badfea9d5c3c56b834697 (git) Affected: 3d024dcef2548028e9f9b7876a544e6e0af00175 (git) Affected: aa51d1c24ec3b6605f7cc7ef500c96cd71d7ef90 (git) Affected: a5b9e44af8d3edaf49d14a91cc519a9fba439e67 (git) Affected: dc6b0ec667f67d4768e72c1b7f1bbc14ea52379c (git) Affected: 9b8b611fe0f86f07a4ff4a5f3bcb0ea7ceb7da3b (git) Affected: 5e226f9689d90ad8ab21b4a969ae3058777f0aff (git) Affected: 3.2.78 , < 3.3 (semver) Affected: 3.10.96 , < 3.11 (semver) Affected: 3.12.57 , < 3.13 (semver) Affected: 3.14.60 , < 3.15 (semver) Affected: 3.18.27 , < 3.19 (semver) Affected: 4.1.17 , < 4.2 (semver) Affected: 4.3.5 , < 4.4 (semver) Affected: 4.4.1 , < 4.5 (semver) |
guessed | |
| Linux | Linux |
Affected:
4.5
Unaffected: 0 , < 4.5 (semver) Unaffected: 4.14.326 , ≤ 4.14.* (semver) Unaffected: 4.19.295 , ≤ 4.19.* (semver) Unaffected: 5.4.257 , ≤ 5.4.* (semver) Unaffected: 5.10.195 , ≤ 5.10.* (semver) Unaffected: 5.15.132 , ≤ 5.15.* (semver) Unaffected: 6.1.54 , ≤ 6.1.* (semver) Unaffected: 6.5.4 , ≤ 6.5.* (semver) Unaffected: 6.6 , ≤ * (original_commit_for_fix) |
guessed |
{
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{
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{
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},
{
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},
{
"status": "affected",
"version": "dc6b0ec667f67d4768e72c1b7f1bbc14ea52379c",
"versionType": "git"
},
{
"status": "affected",
"version": "9b8b611fe0f86f07a4ff4a5f3bcb0ea7ceb7da3b",
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},
{
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},
{
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},
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{
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},
{
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},
{
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"status": "affected",
"version": "3.18.27",
"versionType": "semver"
},
{
"lessThan": "4.2",
"status": "affected",
"version": "4.1.17",
"versionType": "semver"
},
{
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},
{
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}
]
},
{
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],
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},
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"status": "unaffected",
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},
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"version": "4.14.326",
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},
{
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"status": "unaffected",
"version": "4.19.295",
"versionType": "semver"
},
{
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"status": "unaffected",
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"versionType": "semver"
},
{
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"status": "unaffected",
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},
{
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"status": "unaffected",
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"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.1.54",
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},
{
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"status": "unaffected",
"version": "6.5.4",
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},
{
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"status": "unaffected",
"version": "6.6",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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"versionEndExcluding": "4.14.326",
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"vulnerable": true
},
{
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},
{
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},
{
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},
{
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},
{
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},
{
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},
{
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},
{
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},
{
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"versionStartIncluding": "3.10.96",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.12.57",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.14.60",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.18.27",
"vulnerable": true
},
{
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},
{
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},
{
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"versionStartIncluding": "4.4.1",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Fix data-races around user-\u003eunix_inflight.\n\nuser-\u003eunix_inflight is changed under spin_lock(unix_gc_lock),\nbut too_many_unix_fds() reads it locklessly.\n\nLet\u0027s annotate the write/read accesses to user-\u003eunix_inflight.\n\nBUG: KCSAN: data-race in unix_attach_fds / unix_inflight\n\nwrite to 0xffffffff8546f2d0 of 8 bytes by task 44798 on cpu 1:\n unix_inflight+0x157/0x180 net/unix/scm.c:66\n unix_attach_fds+0x147/0x1e0 net/unix/scm.c:123\n unix_scm_to_skb net/unix/af_unix.c:1827 [inline]\n unix_dgram_sendmsg+0x46a/0x14f0 net/unix/af_unix.c:1950\n unix_seqpacket_sendmsg net/unix/af_unix.c:2308 [inline]\n unix_seqpacket_sendmsg+0xba/0x130 net/unix/af_unix.c:2292\n sock_sendmsg_nosec net/socket.c:725 [inline]\n sock_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\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n\nread to 0xffffffff8546f2d0 of 8 bytes by task 44814 on cpu 0:\n too_many_unix_fds net/unix/scm.c:101 [inline]\n unix_attach_fds+0x54/0x1e0 net/unix/scm.c:110\n unix_scm_to_skb net/unix/af_unix.c:1827 [inline]\n unix_dgram_sendmsg+0x46a/0x14f0 net/unix/af_unix.c:1950\n unix_seqpacket_sendmsg net/unix/af_unix.c:2308 [inline]\n unix_seqpacket_sendmsg+0xba/0x130 net/unix/af_unix.c:2292\n sock_sendmsg_nosec net/socket.c:725 [inline]\n sock_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\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n\nvalue changed: 0x000000000000000c -\u003e 0x000000000000000d\n\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"
}
],
"providerMetadata": {
"dateUpdated": "2026-05-23T15:28:14.623Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/df97b5ea9f3ac9308c3a633524dab382cd59d9e5"
},
{
"url": "https://git.kernel.org/stable/c/03d133dfbcec9d439729cc64706c7eb6d1663a24"
},
{
"url": "https://git.kernel.org/stable/c/adcf4e069358cdee8593663650ea447215a1c49e"
},
{
"url": "https://git.kernel.org/stable/c/b401d7e485b0a234cf8fe9a6ae99dbcd20863138"
},
{
"url": "https://git.kernel.org/stable/c/9151ed4b006125cba7c06c79df504340ea4e9386"
},
{
"url": "https://git.kernel.org/stable/c/b9cdbb38e030fc2fe97fe27b54cbb6b4fbff250f"
},
{
"url": "https://git.kernel.org/stable/c/ac92f239a079678a035c0faad9089354a874aede"
},
{
"url": "https://git.kernel.org/stable/c/0bc36c0650b21df36fbec8136add83936eaf0607"
}
],
"title": "af_unix: Fix data-races around user-\u003eunix_inflight.",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2023-53204",
"datePublished": "2025-09-15T14:21:32.696Z",
"dateReserved": "2025-09-15T13:59:19.068Z",
"dateUpdated": "2026-05-23T15:28:14.623Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2023-53204",
"date": "2026-10-21",
"epss": "0.00119",
"percentile": "0.01679"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/unix/scm.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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{
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},
{
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"versionType": "git"
},
{
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"versionType": "git"
},
{
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"versionType": "git"
},
{
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Fix data-races around user-\u003eunix_inflight.\n\nuser-\u003eunix_inflight is changed under spin_lock(unix_gc_lock),\nbut too_many_unix_fds() reads it locklessly.\n\nLet\u0027s annotate the write/read accesses to user-\u003eunix_inflight.\n\nBUG: KCSAN: data-race in unix_attach_fds / unix_inflight\n\nwrite to 0xffffffff8546f2d0 of 8 bytes by task 44798 on cpu 1:\n unix_inflight+0x157/0x180 net/unix/scm.c:66\n unix_attach_fds+0x147/0x1e0 net/unix/scm.c:123\n unix_scm_to_skb net/unix/af_unix.c:1827 [inline]\n unix_dgram_sendmsg+0x46a/0x14f0 net/unix/af_unix.c:1950\n unix_seqpacket_sendmsg net/unix/af_unix.c:2308 [inline]\n unix_seqpacket_sendmsg+0xba/0x130 net/unix/af_unix.c:2292\n sock_sendmsg_nosec net/socket.c:725 [inline]\n sock_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\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n\nread to 0xffffffff8546f2d0 of 8 bytes by task 44814 on cpu 0:\n too_many_unix_fds net/unix/scm.c:101 [inline]\n unix_attach_fds+0x54/0x1e0 net/unix/scm.c:110\n unix_scm_to_skb net/unix/af_unix.c:1827 [inline]\n unix_dgram_sendmsg+0x46a/0x14f0 net/unix/af_unix.c:1950\n unix_seqpacket_sendmsg net/unix/af_unix.c:2308 [inline]\n unix_seqpacket_sendmsg+0xba/0x130 net/unix/af_unix.c:2292\n sock_sendmsg_nosec net/socket.c:725 [inline]\n sock_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\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n\nvalue changed: 0x000000000000000c -\u003e 0x000000000000000d\n\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"
}
],
"id": "CVE-2023-53204",
"lastModified": "2026-06-17T06:44:29.957",
"metrics": {
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{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 4.7,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.0,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2025-09-15T15:15:46.847",
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"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-362"
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],
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},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-29T22:13:31+00:00",
"cve": "CVE-2023-53204",
"id": "CVE-2023-53204",
"initial_release_date": "2023-01-01T00:00:00+00:00",
"product_status:fixed": "279",
"product_status:known_affected": "70",
"product_status:known_not_affected": "118",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: af_unix: Fix data-races around user-\u003eunix_inflight",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53204.json",
"version": "3"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.