GHSA-3W5H-8286-M3QW
Vulnerability from github – Published: 2026-02-14 15:32 – Updated: 2026-02-14 15:32In the Linux kernel, the following vulnerability has been resolved:
l2tp: avoid one data-race in l2tp_tunnel_del_work()
We should read sk->sk_socket only when dealing with kernel sockets.
syzbot reported the following data-race:
BUG: KCSAN: data-race in l2tp_tunnel_del_work / sk_common_release
write to 0xffff88811c182b20 of 8 bytes by task 5365 on cpu 0: sk_set_socket include/net/sock.h:2092 [inline] sock_orphan include/net/sock.h:2118 [inline] sk_common_release+0xae/0x230 net/core/sock.c:4003 udp_lib_close+0x15/0x20 include/net/udp.h:325 inet_release+0xce/0xf0 net/ipv4/af_inet.c:437 __sock_release net/socket.c:662 [inline] sock_close+0x6b/0x150 net/socket.c:1455 __fput+0x29b/0x650 fs/file_table.c:468 _fput+0x1c/0x30 fs/filetable.c:496 task_work_run+0x131/0x1a0 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0x1fe/0x740 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x1e1/0x2b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f
read to 0xffff88811c182b20 of 8 bytes by task 827 on cpu 1: l2tp_tunnel_del_work+0x2f/0x1a0 net/l2tp/l2tp_core.c:1418 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3340 worker_thread+0x582/0x770 kernel/workqueue.c:3421 kthread+0x489/0x510 kernel/kthread.c:463 ret_from_fork+0x149/0x290 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
value changed: 0xffff88811b818000 -> 0x0000000000000000
{
"affected": [],
"aliases": [
"CVE-2026-23120"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-02-14T15:16:07Z",
"severity": null
},
"details": "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-\u003esk_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 -\u003e 0x0000000000000000",
"id": "GHSA-3w5h-8286-m3qw",
"modified": "2026-02-14T15:32:18Z",
"published": "2026-02-14T15:32:18Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23120"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1f63ca44b4f419a1663d94d1bb0b4e2beb73fdb4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/32d417497b79efb403d75f4c185fe6fd9d64b94f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/36c40a80109f1771d59558050b1a71e13c60c759"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3d6d414b214ce31659bded2f8df50c93a3769474"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/68e92085427c84e7679ddb53c0d68836d220b6e7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7a29f6bf60f2590fe5e9c4decb451e19afad2bcf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/eae074dab764ea181bbed5e88626889319177498"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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