CVE-2026-23120 (GCVE-0-2026-23120)

Vulnerability from cvelistv5 – Published: 2026-02-14 15:09 – Updated: 2026-02-14 15:09
VLAI?
Title
l2tp: avoid one data-race in l2tp_tunnel_del_work()
Summary
In 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/file_table.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
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d00fa9adc528c1b0e64d532556764852df8bd7b9 , < 1f63ca44b4f419a1663d94d1bb0b4e2beb73fdb4 (git)
Affected: d00fa9adc528c1b0e64d532556764852df8bd7b9 , < 36c40a80109f1771d59558050b1a71e13c60c759 (git)
Affected: d00fa9adc528c1b0e64d532556764852df8bd7b9 , < eae074dab764ea181bbed5e88626889319177498 (git)
Affected: d00fa9adc528c1b0e64d532556764852df8bd7b9 , < 68e92085427c84e7679ddb53c0d68836d220b6e7 (git)
Affected: d00fa9adc528c1b0e64d532556764852df8bd7b9 , < 3d6d414b214ce31659bded2f8df50c93a3769474 (git)
Affected: d00fa9adc528c1b0e64d532556764852df8bd7b9 , < 32d417497b79efb403d75f4c185fe6fd9d64b94f (git)
Affected: d00fa9adc528c1b0e64d532556764852df8bd7b9 , < 7a29f6bf60f2590fe5e9c4decb451e19afad2bcf (git)
Affected: 15df699fdc5af46a9fb15ae2d9326294852de5b5 (git)
Affected: 18bdaefc715b4530b4b2fe670506bb47713664cc (git)
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    Linux Linux Affected: 4.16
Unaffected: 0 , < 4.16 (semver)
Unaffected: 5.10.249 , ≤ 5.10.* (semver)
Unaffected: 5.15.199 , ≤ 5.15.* (semver)
Unaffected: 6.1.162 , ≤ 6.1.* (semver)
Unaffected: 6.6.122 , ≤ 6.6.* (semver)
Unaffected: 6.12.68 , ≤ 6.12.* (semver)
Unaffected: 6.18.8 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/l2tp/l2tp_core.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "4.16"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.10.249",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.199",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.162",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.122",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.68",
              "versionType": "semver"
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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-\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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-14T15:09:51.223Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
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        {
          "url": "https://git.kernel.org/stable/c/32d417497b79efb403d75f4c185fe6fd9d64b94f"
        },
        {
          "url": "https://git.kernel.org/stable/c/7a29f6bf60f2590fe5e9c4decb451e19afad2bcf"
        }
      ],
      "title": "l2tp: avoid one data-race in l2tp_tunnel_del_work()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23120",
    "datePublished": "2026-02-14T15:09:51.223Z",
    "dateReserved": "2026-01-13T15:37:45.970Z",
    "dateUpdated": "2026-02-14T15:09:51.223Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23120\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-02-14T15:16:07.157\",\"lastModified\":\"2026-02-14T15:16:07.157\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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-\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\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1f63ca44b4f419a1663d94d1bb0b4e2beb73fdb4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/32d417497b79efb403d75f4c185fe6fd9d64b94f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/36c40a80109f1771d59558050b1a71e13c60c759\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3d6d414b214ce31659bded2f8df50c93a3769474\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/68e92085427c84e7679ddb53c0d68836d220b6e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7a29f6bf60f2590fe5e9c4decb451e19afad2bcf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eae074dab764ea181bbed5e88626889319177498\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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