CVE-2023-53088 (GCVE-0-2023-53088)

Vulnerability from cvelistv5 – Published: 2025-05-02 15:55 – Updated: 2026-10-15 21:41
VLAI
Title
mptcp: fix UaF in listener shutdown
Summary
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix UaF in listener shutdown As reported by Christoph after having refactored the passive socket initialization, the mptcp listener shutdown path is prone to an UaF issue. BUG: KASAN: use-after-free in _raw_spin_lock_bh+0x73/0xe0 Write of size 4 at addr ffff88810cb23098 by task syz-executor731/1266 CPU: 1 PID: 1266 Comm: syz-executor731 Not tainted 6.2.0-rc59af4eaa31c1f6c00c8f1e448ed99a45c66340dd5 #6 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x6e/0x91 print_report+0x16a/0x46f kasan_report+0xad/0x130 kasan_check_range+0x14a/0x1a0 _raw_spin_lock_bh+0x73/0xe0 subflow_error_report+0x6d/0x110 sk_error_report+0x3b/0x190 tcp_disconnect+0x138c/0x1aa0 inet_child_forget+0x6f/0x2e0 inet_csk_listen_stop+0x209/0x1060 __mptcp_close_ssk+0x52d/0x610 mptcp_destroy_common+0x165/0x640 mptcp_destroy+0x13/0x80 __mptcp_destroy_sock+0xe7/0x270 __mptcp_close+0x70e/0x9b0 mptcp_close+0x2b/0x150 inet_release+0xe9/0x1f0 __sock_release+0xd2/0x280 sock_close+0x15/0x20 __fput+0x252/0xa20 task_work_run+0x169/0x250 exit_to_user_mode_prepare+0x113/0x120 syscall_exit_to_user_mode+0x1d/0x40 do_syscall_64+0x48/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc The msk grace period can legitly expire in between the last reference count dropped in mptcp_subflow_queue_clean() and the later eventual access in inet_csk_listen_stop() After the previous patch we don't need anymore special-casing msk listener socket cleanup: the mptcp worker will process each of the unaccepted msk sockets. Just drop the now unnecessary code. Please note this commit depends on the two parent ones: mptcp: refactor passive socket initialization mptcp: use the workqueue to destroy unaccepted sockets
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:33 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6aeed9045071f2252ff4e98fc13d1e304f33e5b0 , < 5564be74a22a61855f8b8c100d8c4abb003bb792 (git)
Affected: 6aeed9045071f2252ff4e98fc13d1e304f33e5b0 , < 0f4f4cf5d32f10543deb946a37111e714579511e (git)
Affected: 6aeed9045071f2252ff4e98fc13d1e304f33e5b0 , < 0a3f4f1f9c27215e4ddcd312558342e57b93e518 (git)
Affected: a8a3e95c74e48c2c9b07b81fafda9122993f2e12 (git)
Affected: 5.18.10 , < 5.19 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.1.22 , ≤ 6.1.* (semver)
Unaffected: 6.2.8 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mptcp: correcci\u00f3n de UaF en el apagado del oyente Como inform\u00f3 Christoph despu\u00e9s de haber refactorizado la inicializaci\u00f3n del socket pasivo, la ruta de apagado del oyente mptcp es propensa a un problema de UaF. ERROR: KASAN: use-after-free en _raw_spin_lock_bh+0x73/0xe0 Escritura de tama\u00f1o 4 en la direcci\u00f3n ffff88810cb23098 por la tarea syz-executor731/1266 CPU: 1 PID: 1266 Comm: syz-executor731 No contaminado 6.2.0-rc59af4eaa31c1f6c00c8f1e448ed99a45c66340dd5 #6 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 01/04/2014 Rastreo de llamadas:  dump_stack_lvl+0x6e/0x91 print_report+0x16a/0x46f kasan_report+0xad/0x130 kasan_check_range+0x14a/0x1a0 _raw_spin_lock_bh+0x73/0xe0 subflow_error_report+0x6d/0x110 sk_error_report+0x3b/0x190 tcp_disconnect+0x138c/0x1aa0 inet_child_forget+0x6f/0x2e0 inet_csk_listen_stop+0x209/0x1060 __mptcp_close_ssk+0x52d/0x610 mptcp_destroy_common+0x165/0x640 mptcp_destroy+0x13/0x80 __mptcp_destroy_sock+0xe7/0x270 __mptcp_close+0x70e/0x9b0 mptcp_close+0x2b/0x150 inet_release+0xe9/0x1f0 __sock_release+0xd2/0x280 sock_close+0x15/0x20 __fput+0x252/0xa20 task_work_run+0x169/0x250 exit_to_user_mode_prepare+0x113/0x120 syscall_exit_to_user_mode+0x1d/0x40 do_syscall_64+0x48/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc puede expirar leg\u00edtimamente entre el \u00faltimo recuento de referencias introducido en mptcp_subflow_queue_clean() y el acceso eventual posterior en inet_csk_listen_stop(). Tras la actualizaci\u00f3n anterior, ya no necesitamos la limpieza de sockets del receptor MSK con casos especiales: el trabajador de mptcp procesar\u00e1 cada uno de los sockets MSK no aceptados. Simplemente elimine el c\u00f3digo innecesario. Tenga en cuenta que esta confirmaci\u00f3n depende de las dos principales: mptcp: refactorizar la inicializaci\u00f3n pasiva de sockets. mptcp: usar la cola de trabajo para eliminar los sockets no aceptados."
          }
        ],
        "id": "CVE-2023-53088",
        "lastModified": "2026-10-15T22:17:36.980",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2023-53088",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-15T21:33:38.582433Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2025-05-02T16:15:27.760",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/0a3f4f1f9c27215e4ddcd312558342e57b93e518"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
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            "url": "https://git.kernel.org/stable/c/0f4f4cf5d32f10543deb946a37111e714579511e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/5564be74a22a61855f8b8c100d8c4abb003bb792"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-05T10:44:08+00:00",
      "cve": "CVE-2023-53088",
      "id": "CVE-2023-53088",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "120",
      "product_status:known_affected": "125",
      "product_status:known_not_affected": "43",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mptcp: fix UaF in listener shutdown",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53088.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2023-53088",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-15T21:33:38.582433Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-15T21:33:39.423Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "net/mptcp/protocol.c",
                "net/mptcp/protocol.h",
                "net/mptcp/subflow.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "5564be74a22a61855f8b8c100d8c4abb003bb792",
                  "status": "affected",
                  "version": "6aeed9045071f2252ff4e98fc13d1e304f33e5b0",
                  "versionType": "git"
                },
                {
                  "lessThan": "0f4f4cf5d32f10543deb946a37111e714579511e",
                  "status": "affected",
                  "version": "6aeed9045071f2252ff4e98fc13d1e304f33e5b0",
                  "versionType": "git"
                },
                {
                  "lessThan": "0a3f4f1f9c27215e4ddcd312558342e57b93e518",
                  "status": "affected",
                  "version": "6aeed9045071f2252ff4e98fc13d1e304f33e5b0",
                  "versionType": "git"
                },
                {
                  "status": "affected",
                  "version": "a8a3e95c74e48c2c9b07b81fafda9122993f2e12",
                  "versionType": "git"
                },
                {
                  "lessThan": "5.19",
                  "status": "affected",
                  "version": "5.18.10",
                  "versionType": "semver"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "net/mptcp/protocol.c",
                "net/mptcp/protocol.h",
                "net/mptcp/subflow.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.19"
                },
                {
                  "lessThan": "5.19",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.22",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.2.*",
                  "status": "unaffected",
                  "version": "6.2.8",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.3",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.22",
                      "versionStartIncluding": "5.19",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.2.8",
                      "versionStartIncluding": "5.19",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.3",
                      "versionStartIncluding": "5.19",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "5.18.10",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix UaF in listener shutdown\n\nAs reported by Christoph after having refactored the passive\nsocket initialization, the mptcp listener shutdown path is prone\nto an UaF issue.\n\n  BUG: KASAN: use-after-free in _raw_spin_lock_bh+0x73/0xe0\n  Write of size 4 at addr ffff88810cb23098 by task syz-executor731/1266\n\n  CPU: 1 PID: 1266 Comm: syz-executor731 Not tainted 6.2.0-rc59af4eaa31c1f6c00c8f1e448ed99a45c66340dd5 #6\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0x6e/0x91\n   print_report+0x16a/0x46f\n   kasan_report+0xad/0x130\n   kasan_check_range+0x14a/0x1a0\n   _raw_spin_lock_bh+0x73/0xe0\n   subflow_error_report+0x6d/0x110\n   sk_error_report+0x3b/0x190\n   tcp_disconnect+0x138c/0x1aa0\n   inet_child_forget+0x6f/0x2e0\n   inet_csk_listen_stop+0x209/0x1060\n   __mptcp_close_ssk+0x52d/0x610\n   mptcp_destroy_common+0x165/0x640\n   mptcp_destroy+0x13/0x80\n   __mptcp_destroy_sock+0xe7/0x270\n   __mptcp_close+0x70e/0x9b0\n   mptcp_close+0x2b/0x150\n   inet_release+0xe9/0x1f0\n   __sock_release+0xd2/0x280\n   sock_close+0x15/0x20\n   __fput+0x252/0xa20\n   task_work_run+0x169/0x250\n   exit_to_user_mode_prepare+0x113/0x120\n   syscall_exit_to_user_mode+0x1d/0x40\n   do_syscall_64+0x48/0x90\n   entry_SYSCALL_64_after_hwframe+0x72/0xdc\n\nThe msk grace period can legitly expire in between the last\nreference count dropped in mptcp_subflow_queue_clean() and\nthe later eventual access in inet_csk_listen_stop()\n\nAfter the previous patch we don\u0027t need anymore special-casing\nmsk listener socket cleanup: the mptcp worker will process each\nof the unaccepted msk sockets.\n\nJust drop the now unnecessary code.\n\nPlease note this commit depends on the two parent ones:\n\n  mptcp: refactor passive socket initialization\n  mptcp: use the workqueue to destroy unaccepted sockets"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The bug is triggered by closing a local MPTCP listening socket that still has unaccepted connections; the entry path is socket/bind/listen/connect/close syscalls, not remote packet processing alone.\nAC:L - The attacker fully controls both the listener and the connecting peer and can force the close path that frees the msk then reuses it; the RCU window is schedulable (mutex between sock_put and inet_csk_listen_stop) and was reliably hit by syzkaller reproducers.\nPR:L - Creating and listening on IPPROTO_MPTCP sockets requires only an unprivileged local account (mptcp enabled by default; no CAP_* on the trigger path), including inside user/net namespaces.\nUI:N - Exploitation uses only the attacker\u0027s own sockets and close(); no victim action is required.\nS:U - This is a same-host kernel memory-corruption privilege-escalation class bug; impact stays within the kernel\u0027s security authority with no VM/IOMMU boundary crossed.\nC:H - The UAF targets a full mptcp/struct sock object in kmalloc-2k; after RCU free the attacker can reclaim and read through the dangling subflow-\u003econn reference.\nI:H - Reclaiming the freed sock enables controlled writes and control-flow hijack via the subsequent subflow_error_report/mptcp_data_lock path on attacker-influenced memory.\nA:H - The UAF already produces a KASAN-detectable kernel write-after-free/oops on the spinlock path, so availability impact is a full kernel crash even without further exploitation."
                }
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            "dateUpdated": "2026-08-05T09:12:43.438Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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              "url": "https://git.kernel.org/stable/c/0a3f4f1f9c27215e4ddcd312558342e57b93e518"
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          "title": "mptcp: fix UaF in listener shutdown",
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        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2023-53088",
        "datePublished": "2025-05-02T15:55:34.840Z",
        "dateReserved": "2025-05-02T15:51:43.551Z",
        "dateUpdated": "2026-10-15T21:41:26.237Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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