{"id":"CVE-2026-23120","state":"PUBLISHED","title":"l2tp: avoid one data-race in l2tp_tunnel_del_work()","description":"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: 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","publishedAt":"2026-02-14T15:09:51.223Z","updatedAt":"2026-10-19T18:25:31.962Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d00fa9adc528c1b0e64d532556764852df8bd7b9","status":"affected","lessThan":"1f63ca44b4f419a1663d94d1bb0b4e2beb73fdb4","versionType":"git"},{"version":"d00fa9adc528c1b0e64d532556764852df8bd7b9","status":"affected","lessThan":"36c40a80109f1771d59558050b1a71e13c60c759","versionType":"git"},{"version":"d00fa9adc528c1b0e64d532556764852df8bd7b9","status":"affected","lessThan":"eae074dab764ea181bbed5e88626889319177498","versionType":"git"},{"version":"d00fa9adc528c1b0e64d532556764852df8bd7b9","status":"affected","lessThan":"68e92085427c84e7679ddb53c0d68836d220b6e7","versionType":"git"},{"version":"d00fa9adc528c1b0e64d532556764852df8bd7b9","status":"affected","lessThan":"3d6d414b214ce31659bded2f8df50c93a3769474","versionType":"git"},{"version":"d00fa9adc528c1b0e64d532556764852df8bd7b9","status":"affected","lessThan":"32d417497b79efb403d75f4c185fe6fd9d64b94f","versionType":"git"},{"version":"d00fa9adc528c1b0e64d532556764852df8bd7b9","status":"affected","lessThan":"7a29f6bf60f2590fe5e9c4decb451e19afad2bcf","versionType":"git"},{"version":"15df699fdc5af46a9fb15ae2d9326294852de5b5","status":"affected","versionType":"git"},{"version":"18bdaefc715b4530b4b2fe670506bb47713664cc","status":"affected","versionType":"git"},{"version":"3.16.57","status":"affected","lessThan":"3.17","versionType":"semver"},{"version":"4.15.8","status":"affected","lessThan":"4.16","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/l2tp/l2tp_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.16","versionType":"semver"},{"version":"5.10.249","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.199","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.162","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.122","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.68","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.8","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/l2tp/l2tp_core.c"]}],"references":["https://git.kernel.org/stable/c/1f63ca44b4f419a1663d94d1bb0b4e2beb73fdb4","https://git.kernel.org/stable/c/36c40a80109f1771d59558050b1a71e13c60c759","https://git.kernel.org/stable/c/eae074dab764ea181bbed5e88626889319177498","https://git.kernel.org/stable/c/68e92085427c84e7679ddb53c0d68836d220b6e7","https://git.kernel.org/stable/c/3d6d414b214ce31659bded2f8df50c93a3769474","https://git.kernel.org/stable/c/32d417497b79efb403d75f4c185fe6fd9d64b94f","https://git.kernel.org/stable/c/7a29f6bf60f2590fe5e9c4decb451e19afad2bcf"],"weaknesses":["CWE-362"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23120.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23120","state":"PUBLISHED","datePublished":"2026-02-14T15:09:51.223Z","dateUpdated":"2026-10-19T18:25:31.962Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:45.970Z"},"containers":{"cna":{"title":"l2tp: avoid one data-race in l2tp_tunnel_del_work()","descriptions":[{"lang":"en","value":"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: 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"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d00fa9adc528c1b0e64d532556764852df8bd7b9","status":"affected","lessThan":"1f63ca44b4f419a1663d94d1bb0b4e2beb73fdb4","versionType":"git"},{"version":"d00fa9adc528c1b0e64d532556764852df8bd7b9","status":"affected","lessThan":"36c40a80109f1771d59558050b1a71e13c60c759","versionType":"git"},{"version":"d00fa9adc528c1b0e64d532556764852df8bd7b9","status":"affected","lessThan":"eae074dab764ea181bbed5e88626889319177498","versionType":"git"},{"version":"d00fa9adc528c1b0e64d532556764852df8bd7b9","status":"affected","lessThan":"68e92085427c84e7679ddb53c0d68836d220b6e7","versionType":"git"},{"version":"d00fa9adc528c1b0e64d532556764852df8bd7b9","status":"affected","lessThan":"3d6d414b214ce31659bded2f8df50c93a3769474","versionType":"git"},{"version":"d00fa9adc528c1b0e64d532556764852df8bd7b9","status":"affected","lessThan":"32d417497b79efb403d75f4c185fe6fd9d64b94f","versionType":"git"},{"version":"d00fa9adc528c1b0e64d532556764852df8bd7b9","status":"affected","lessThan":"7a29f6bf60f2590fe5e9c4decb451e19afad2bcf","versionType":"git"},{"version":"15df699fdc5af46a9fb15ae2d9326294852de5b5","status":"affected","versionType":"git"},{"version":"18bdaefc715b4530b4b2fe670506bb47713664cc","status":"affected","versionType":"git"},{"version":"3.16.57","status":"affected","lessThan":"3.17","versionType":"semver"},{"version":"4.15.8","status":"affected","lessThan":"4.16","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/l2tp/l2tp_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.16","versionType":"semver"},{"version":"5.10.249","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.199","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.162","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.122","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.68","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.8","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/l2tp/l2tp_core.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-23T16:03:54.143Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"5.10.249"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"5.15.199"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.1.162"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.6.122"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.12.68"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.18.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15.8"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-23120","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-06-10T20:41:40.769196Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-362","lang":"en","type":"CWE","description":"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T18:25:31.962Z"}}]}}}