{"id":"CVE-2026-23120","title":"l2tp: avoid one data-race in l2tp_tunnel_del_work()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nl2tp: avoid one data-race in l2tp_tunnel_del_work()\n\nWe should read sk->sk_socket only when dealing with kernel sockets.\n\nsyzbot reported the following data-race:\n\nBUG:…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= d00fa9adc528c1b0e64d532556764852df8bd7b9 < 1f63ca44b4f419a1663d94d1bb0b4e2beb73fdb4","Linux >= d00fa9adc528c1b0e64d532556764852df8bd7b9 < 36c40a80109f1771d59558050b1a71e13c60c759","Linux >= d00fa9adc528c1b0e64d532556764852df8bd7b9 < eae074dab764ea181bbed5e88626889319177498","Linux >= d00fa9adc528c1b0e64d532556764852df8bd7b9 < 68e92085427c84e7679ddb53c0d68836d220b6e7","Linux >= d00fa9adc528c1b0e64d532556764852df8bd7b9 < 3d6d414b214ce31659bded2f8df50c93a3769474","Linux >= d00fa9adc528c1b0e64d532556764852df8bd7b9 < 32d417497b79efb403d75f4c185fe6fd9d64b94f","Linux >= d00fa9adc528c1b0e64d532556764852df8bd7b9 < 7a29f6bf60f2590fe5e9c4decb451e19afad2bcf","Linux 15df699fdc5af46a9fb15ae2d9326294852de5b5","Linux 18bdaefc715b4530b4b2fe670506bb47713664cc","Linux >= 3.16.57 < 3.17","Linux >= 4.15.8 < 4.16","Linux 4.16"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-10T20:41:40.769196Z"},"published":"2026-02-14","updated":"2026-10-19","sourceUpdated":"2026-10-19T18:25:31.962Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23120","references":[{"url":"https://git.kernel.org/stable/c/1f63ca44b4f419a1663d94d1bb0b4e2beb73fdb4"},{"url":"https://git.kernel.org/stable/c/36c40a80109f1771d59558050b1a71e13c60c759"},{"url":"https://git.kernel.org/stable/c/eae074dab764ea181bbed5e88626889319177498"},{"url":"https://git.kernel.org/stable/c/68e92085427c84e7679ddb53c0d68836d220b6e7"},{"url":"https://git.kernel.org/stable/c/3d6d414b214ce31659bded2f8df50c93a3769474"},{"url":"https://git.kernel.org/stable/c/32d417497b79efb403d75f4c185fe6fd9d64b94f"},{"url":"https://git.kernel.org/stable/c/7a29f6bf60f2590fe5e9c4decb451e19afad2bcf"}],"tags":["cve.org"],"epss":0.00134,"epssPercentile":0.02573,"ingestedAt":"2026-10-19T18:35:50.102Z","slug":"CVE-2026-23120","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nl2tp: avoid one data-race in l2tp_tunnel_del_work()\n\nWe should read sk->sk_socket only when dealing with kernel sockets.\n\nsyzbot reported the following data-race:\n\nBUG: KCSAN: data-race in l2tp_tunnel_del_work / sk_common_release\n\nwrite to 0xffff88811c182b20 of 8 bytes by task 5365 on cpu 0:\n  sk_set_socket include/net/sock.h:2092 [inline]\n  sock_orphan include/net/sock.h:2118 [inline]\n  sk_common_release+0xae/0x230 net/core/sock.c:4003\n  udp_lib_close+0x15/0x20 include/net/udp.h:325\n  inet_release+0xce/0xf0 net/ipv4/af_inet.c:437\n  __sock_release net/socket.c:662 [inline]\n  sock_close+0x6b/0x150 net/socket.c:1455\n  __fput+0x29b/0x650 fs/file_table.c:468\n  ____fput+0x1c/0x30 fs/file_table.c:496\n  task_work_run+0x131/0x1a0 kernel/task_work.c:233\n  resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]\n  __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]\n  exit_to_user_mode_loop+0x1fe/0x740 kernel/entry/common.c:75\n  __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]\n  syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]\n  syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]\n  syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]\n  do_syscall_64+0x1e1/0x2b0 arch/x86/entry/syscall_64.c:100\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nread to 0xffff88811c182b20 of 8 bytes by task 827 on cpu 1:\n  l2tp_tunnel_del_work+0x2f/0x1a0 net/l2tp/l2tp_core.c:1418\n  process_one_work kernel/workqueue.c:3257 [inline]\n  process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3340\n  worker_thread+0x582/0x770 kernel/workqueue.c:3421\n  kthread+0x489/0x510 kernel/kthread.c:463\n  ret_from_fork+0x149/0x290 arch/x86/kernel/process.c:158\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246\n\nvalue changed: 0xffff88811b818000 -> 0x0000000000000000\n\n## Affected\n\n- `Linux >= d00fa9adc528c1b0e64d532556764852df8bd7b9 < 1f63ca44b4f419a1663d94d1bb0b4e2beb73fdb4`\n- `Linux >= d00fa9adc528c1b0e64d532556764852df8bd7b9 < 36c40a80109f1771d59558050b1a71e13c60c759`\n- `Linux >= d00fa9adc528c1b0e64d532556764852df8bd7b9 < eae074dab764ea181bbed5e88626889319177498`\n- `Linux >= d00fa9adc528c1b0e64d532556764852df8bd7b9 < 68e92085427c84e7679ddb53c0d68836d220b6e7`\n- `Linux >= d00fa9adc528c1b0e64d532556764852df8bd7b9 < 3d6d414b214ce31659bded2f8df50c93a3769474`\n- `Linux >= d00fa9adc528c1b0e64d532556764852df8bd7b9 < 32d417497b79efb403d75f4c185fe6fd9d64b94f`\n- `Linux >= d00fa9adc528c1b0e64d532556764852df8bd7b9 < 7a29f6bf60f2590fe5e9c4decb451e19afad2bcf`\n- `Linux 15df699fdc5af46a9fb15ae2d9326294852de5b5`\n- `Linux 18bdaefc715b4530b4b2fe670506bb47713664cc`\n- `Linux >= 3.16.57 < 3.17`\n- `Linux >= 4.15.8 < 4.16`\n- `Linux 4.16`\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":[]}