{"id":"CVE-2023-53824","title":"netlink: annotate lockless accesses to nlk->max_recvmsg_len","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetlink: annotate lockless accesses to nlk->max_recvmsg_len\n\nsyzbot reported a data-race in data-race in netlink_recvmsg() [1]\n\nIndeed, netlink_recvmsg() can be run con…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 9063e21fb026c4966fc93261c18322214f9835eb < 05c9e3fc93b02d18c3ab258d43350a6d44b40bbd","Linux >= 9063e21fb026c4966fc93261c18322214f9835eb < 7cff4103be7c402ecc3e7bf8f95a64089e3c91b8","Linux >= 9063e21fb026c4966fc93261c18322214f9835eb < e3bcf2a77060bea4d8d09cb09d92c7056f07df5a","Linux >= 9063e21fb026c4966fc93261c18322214f9835eb < fc4ba13013ddaea8b11b88fd52b35449e2d9cf85","Linux >= 9063e21fb026c4966fc93261c18322214f9835eb < a1865f2e7d10dde00d35a2122b38d2e469ae67ed","Linux 3.15"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:37:29.602412Z"},"published":"2025-12-09","updated":"2026-10-15","sourceUpdated":"2026-10-15T21:41:36.860Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-53824","references":[{"url":"https://git.kernel.org/stable/c/05c9e3fc93b02d18c3ab258d43350a6d44b40bbd"},{"url":"https://git.kernel.org/stable/c/7cff4103be7c402ecc3e7bf8f95a64089e3c91b8"},{"url":"https://git.kernel.org/stable/c/e3bcf2a77060bea4d8d09cb09d92c7056f07df5a"},{"url":"https://git.kernel.org/stable/c/fc4ba13013ddaea8b11b88fd52b35449e2d9cf85"},{"url":"https://git.kernel.org/stable/c/a1865f2e7d10dde00d35a2122b38d2e469ae67ed"}],"tags":["cve.org"],"epss":0.00194,"epssPercentile":0.08475,"ingestedAt":"2026-10-15T22:48:25.423Z","slug":"CVE-2023-53824","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnetlink: annotate lockless accesses to nlk->max_recvmsg_len\n\nsyzbot reported a data-race in data-race in netlink_recvmsg() [1]\n\nIndeed, netlink_recvmsg() can be run concurrently,\nand netlink_dump() also needs protection.\n\n[1]\nBUG: KCSAN: data-race in netlink_recvmsg / netlink_recvmsg\n\nread to 0xffff888141840b38 of 8 bytes by task 23057 on cpu 0:\nnetlink_recvmsg+0xea/0x730 net/netlink/af_netlink.c:1988\nsock_recvmsg_nosec net/socket.c:1017 [inline]\nsock_recvmsg net/socket.c:1038 [inline]\n__sys_recvfrom+0x1ee/0x2e0 net/socket.c:2194\n__do_sys_recvfrom net/socket.c:2212 [inline]\n__se_sys_recvfrom net/socket.c:2208 [inline]\n__x64_sys_recvfrom+0x78/0x90 net/socket.c:2208\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nwrite to 0xffff888141840b38 of 8 bytes by task 23037 on cpu 1:\nnetlink_recvmsg+0x114/0x730 net/netlink/af_netlink.c:1989\nsock_recvmsg_nosec net/socket.c:1017 [inline]\nsock_recvmsg net/socket.c:1038 [inline]\n____sys_recvmsg+0x156/0x310 net/socket.c:2720\n___sys_recvmsg net/socket.c:2762 [inline]\ndo_recvmmsg+0x2e5/0x710 net/socket.c:2856\n__sys_recvmmsg net/socket.c:2935 [inline]\n__do_sys_recvmmsg net/socket.c:2958 [inline]\n__se_sys_recvmmsg net/socket.c:2951 [inline]\n__x64_sys_recvmmsg+0xe2/0x160 net/socket.c:2951\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nvalue changed: 0x0000000000000000 -> 0x0000000000001000\n\nReported by Kernel Concurrency Sanitizer on:\nCPU: 1 PID: 23037 Comm: syz-executor.2 Not tainted 6.3.0-rc4-syzkaller-00195-g5a57b48fdfcb #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023\n\n## Affected\n\n- `Linux >= 9063e21fb026c4966fc93261c18322214f9835eb < 05c9e3fc93b02d18c3ab258d43350a6d44b40bbd`\n- `Linux >= 9063e21fb026c4966fc93261c18322214f9835eb < 7cff4103be7c402ecc3e7bf8f95a64089e3c91b8`\n- `Linux >= 9063e21fb026c4966fc93261c18322214f9835eb < e3bcf2a77060bea4d8d09cb09d92c7056f07df5a`\n- `Linux >= 9063e21fb026c4966fc93261c18322214f9835eb < fc4ba13013ddaea8b11b88fd52b35449e2d9cf85`\n- `Linux >= 9063e21fb026c4966fc93261c18322214f9835eb < a1865f2e7d10dde00d35a2122b38d2e469ae67ed`\n- `Linux 3.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}