Vulnerability-Lookup

FKIE_CVE-2026-23120

Vulnerability from fkie_nvd - Published: 2026-02-14 15:16 - Updated: 2026-10-19 19:17

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1f63ca44b4f419a1663d94d1bb0b4e2beb73fdb4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/32d417497b79efb403d75f4c185fe6fd9d64b94f	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/36c40a80109f1771d59558050b1a71e13c60c759	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3d6d414b214ce31659bded2f8df50c93a3769474	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/68e92085427c84e7679ddb53c0d68836d220b6e7	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7a29f6bf60f2590fe5e9c4decb451e19afad2bcf	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/eae074dab764ea181bbed5e88626889319177498	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	4.16
linux	linux_kernel	4.16
linux	linux_kernel	4.16
linux	linux_kernel	4.16
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19
linux	linux_kernel	6.19

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/l2tp/l2tp_core.c"
          ],
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          "vendor": "Linux",
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            {
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            },
            {
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              "version": "18bdaefc715b4530b4b2fe670506bb47713664cc",
              "versionType": "git"
            },
            {
              "lessThan": "3.17",
              "status": "affected",
              "version": "3.16.57",
              "versionType": "semver"
            },
            {
              "lessThan": "4.16",
              "status": "affected",
              "version": "4.15.8",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/l2tp/l2tp_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "4.16"
            },
            {
              "lessThan": "4.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "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"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
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              "vulnerable": true
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  "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"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nl2tp: evitar una carrera de datos en l2tp_tunnel_del_work()\n\nDeber\u00edamos leer sk-\u0026gt;sk_socket solo cuando se trata de sockets del kernel.\n\nsyzbot inform\u00f3 la siguiente carrera de datos:\n\nBUG: KCSAN: carrera de datos en l2tp_tunnel_del_work / sk_common_release\n\nescritura en 0xffff88811c182b20 de 8 bytes por la tarea 5365 en la 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\nlectura en 0xffff88811c182b20 de 8 bytes por la tarea 827 en la 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\nvalor cambiado: 0xffff88811b818000 -\u0026gt; 0x0000000000000000"
    }
  ],
  "id": "CVE-2026-23120",
  "lastModified": "2026-10-19T19:17:37.690",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-23120",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-10T20:41:40.769196Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-02-14T15:16:07.157",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/1f63ca44b4f419a1663d94d1bb0b4e2beb73fdb4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/32d417497b79efb403d75f4c185fe6fd9d64b94f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/36c40a80109f1771d59558050b1a71e13c60c759"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      ],
      "url": "https://git.kernel.org/stable/c/3d6d414b214ce31659bded2f8df50c93a3769474"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/68e92085427c84e7679ddb53c0d68836d220b6e7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/7a29f6bf60f2590fe5e9c4decb451e19afad2bcf"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/eae074dab764ea181bbed5e88626889319177498"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-362"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-02-14 15:09 – Updated: 2026-10-19 18:25

Title

l2tp: avoid one data-race in l2tp_tunnel_del_work()

Summary

Severity

No CVSS data available.

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-10 20:41 UTC

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6637 records in the last 180 days details

References

7 references

URL	Tags
https://git.kernel.org/stable/c/1f63ca44b4f419a16…
https://git.kernel.org/stable/c/36c40a80109f1771d…
https://git.kernel.org/stable/c/eae074dab764ea181…
https://git.kernel.org/stable/c/68e92085427c84e76…
https://git.kernel.org/stable/c/3d6d414b214ce3165…
https://git.kernel.org/stable/c/32d417497b79efb40…
https://git.kernel.org/stable/c/7a29f6bf60f2590fe…

Impacted products

2 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) Affected: 3.16.57 , < 3.17 (semver) Affected: 4.15.8 , < 4.16 (semver)
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)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-23120",
                "options": [
                  {
                    "Exploitation": "none"
                  },
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-10T20:41:40.769196Z",
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                "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
                "lang": "en",
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        "providerMetadata": {
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              "status": "unaffected",
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      "cpeApplicability": [
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          "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"
        }
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      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      ],
      "title": "l2tp: avoid one data-race in l2tp_tunnel_del_work()",
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    "dateReserved": "2026-01-13T15:37:45.970Z",
    "dateUpdated": "2026-10-19T18:25:31.962Z",
    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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