{"id":"CVE-2023-53204","title":"af_unix: Fix data-races around user->unix_inflight.","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Fix data-races around user->unix_inflight.\n\nuser->unix_inflight is changed under spin_lock(unix_gc_lock),\nbut too_many_unix_fds() reads it locklessly.\n\nLet's a…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 712f4aad406bb1ed67f3f98d04c044191f0ff593 < df97b5ea9f3ac9308c3a633524dab382cd59d9e5","Linux >= 712f4aad406bb1ed67f3f98d04c044191f0ff593 < 03d133dfbcec9d439729cc64706c7eb6d1663a24","Linux >= 712f4aad406bb1ed67f3f98d04c044191f0ff593 < adcf4e069358cdee8593663650ea447215a1c49e","Linux >= 712f4aad406bb1ed67f3f98d04c044191f0ff593 < b401d7e485b0a234cf8fe9a6ae99dbcd20863138","Linux >= 712f4aad406bb1ed67f3f98d04c044191f0ff593 < 9151ed4b006125cba7c06c79df504340ea4e9386","Linux >= 712f4aad406bb1ed67f3f98d04c044191f0ff593 < b9cdbb38e030fc2fe97fe27b54cbb6b4fbff250f","Linux >= 712f4aad406bb1ed67f3f98d04c044191f0ff593 < ac92f239a079678a035c0faad9089354a874aede","Linux >= 712f4aad406bb1ed67f3f98d04c044191f0ff593 < 0bc36c0650b21df36fbec8136add83936eaf0607","Linux a5a6cf8c405e826ff7ed1308dde72560c0ed4854","Linux df87da0783c4492b944badfea9d5c3c56b834697","Linux 3d024dcef2548028e9f9b7876a544e6e0af00175","Linux aa51d1c24ec3b6605f7cc7ef500c96cd71d7ef90","Linux a5b9e44af8d3edaf49d14a91cc519a9fba439e67","Linux dc6b0ec667f67d4768e72c1b7f1bbc14ea52379c","Linux 9b8b611fe0f86f07a4ff4a5f3bcb0ea7ceb7da3b","Linux 5e226f9689d90ad8ab21b4a969ae3058777f0aff","Linux >= 3.2.78 < 3.3","Linux >= 3.10.96 < 3.11","Linux >= 3.12.57 < 3.13","Linux >= 3.14.60 < 3.15","Linux >= 3.18.27 < 3.19","Linux >= 4.1.17 < 4.2","Linux >= 4.3.5 < 4.4","Linux >= 4.4.1 < 4.5","Linux 4.5"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T20:20:30.750540Z"},"published":"2025-09-15","updated":"2026-11-05","sourceUpdated":"2026-11-05T20:21:07.602Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-53204","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"}],"tags":["cve.org"],"epss":0.00119,"epssPercentile":0.01779,"ingestedAt":"2026-11-05T22:38:31.787Z","slug":"CVE-2023-53204","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Fix data-races around user->unix_inflight.\n\nuser->unix_inflight is changed under spin_lock(unix_gc_lock),\nbut too_many_unix_fds() reads it locklessly.\n\nLet's annotate the write/read accesses to user->unix_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 -> 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\n\n## Affected\n\n- `Linux >= 712f4aad406bb1ed67f3f98d04c044191f0ff593 < df97b5ea9f3ac9308c3a633524dab382cd59d9e5`\n- `Linux >= 712f4aad406bb1ed67f3f98d04c044191f0ff593 < 03d133dfbcec9d439729cc64706c7eb6d1663a24`\n- `Linux >= 712f4aad406bb1ed67f3f98d04c044191f0ff593 < adcf4e069358cdee8593663650ea447215a1c49e`\n- `Linux >= 712f4aad406bb1ed67f3f98d04c044191f0ff593 < b401d7e485b0a234cf8fe9a6ae99dbcd20863138`\n- `Linux >= 712f4aad406bb1ed67f3f98d04c044191f0ff593 < 9151ed4b006125cba7c06c79df504340ea4e9386`\n- `Linux >= 712f4aad406bb1ed67f3f98d04c044191f0ff593 < b9cdbb38e030fc2fe97fe27b54cbb6b4fbff250f`\n- `Linux >= 712f4aad406bb1ed67f3f98d04c044191f0ff593 < ac92f239a079678a035c0faad9089354a874aede`\n- `Linux >= 712f4aad406bb1ed67f3f98d04c044191f0ff593 < 0bc36c0650b21df36fbec8136add83936eaf0607`\n- `Linux a5a6cf8c405e826ff7ed1308dde72560c0ed4854`\n- `Linux df87da0783c4492b944badfea9d5c3c56b834697`\n- `Linux 3d024dcef2548028e9f9b7876a544e6e0af00175`\n- `Linux aa51d1c24ec3b6605f7cc7ef500c96cd71d7ef90`\n- `Linux a5b9e44af8d3edaf49d14a91cc519a9fba439e67`\n- `Linux dc6b0ec667f67d4768e72c1b7f1bbc14ea52379c`\n- `Linux 9b8b611fe0f86f07a4ff4a5f3bcb0ea7ceb7da3b`\n- `Linux 5e226f9689d90ad8ab21b4a969ae3058777f0aff`\n- `Linux >= 3.2.78 < 3.3`\n- `Linux >= 3.10.96 < 3.11`\n- `Linux >= 3.12.57 < 3.13`\n- `Linux >= 3.14.60 < 3.15`\n- `Linux >= 3.18.27 < 3.19`\n- `Linux >= 4.1.17 < 4.2`\n- `Linux >= 4.3.5 < 4.4`\n- `Linux >= 4.4.1 < 4.5`\n- `Linux 4.5`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}