Vulnerability-Lookup

FKIE_CVE-2023-53088

Vulnerability from fkie_nvd - Published: 2025-05-02 16:15 - Updated: 2026-08-04 10:18

Severity

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

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

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0a3f4f1f9c27215e4ddcd312558342e57b93e518	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0f4f4cf5d32f10543deb946a37111e714579511e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5564be74a22a61855f8b8c100d8c4abb003bb792	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	5.19
linux	linux_kernel	5.19
linux	linux_kernel	5.19
linux	linux_kernel	5.19
linux	linux_kernel	5.19
linux	linux_kernel	6.3
linux	linux_kernel	6.3

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mptcp/protocol.c",
            "net/mptcp/protocol.h",
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              "version": "6.2.8",
              "versionType": "semver"
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  "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"
    },
    {
      "lang": "es",
      "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": "2026-08-04T10:18:54.637",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
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          "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",
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        "impactScore": 5.9,
        "source": "nvd@nist.gov",
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  "published": "2025-05-02T16:15:27.760",
  "references": [
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      "tags": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2025-05-02 15:55 – Updated: 2026-08-05 09:12

Title

mptcp: fix UaF in listener shutdown

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/5564be74a22a61855…
https://git.kernel.org/stable/c/0f4f4cf5d32f10543…
https://git.kernel.org/stable/c/0a3f4f1f9c27215e4…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 6aeed9045071f2252ff4e98fc13d1e304f33e5b0 , < 5564be74a22a61855f8b8c100d8c4abb003bb792 (git) Affected: 6aeed9045071f2252ff4e98fc13d1e304f33e5b0 , < 0f4f4cf5d32f10543deb946a37111e714579511e (git) Affected: 6aeed9045071f2252ff4e98fc13d1e304f33e5b0 , < 0a3f4f1f9c27215e4ddcd312558342e57b93e518 (git) Affected: a8a3e95c74e48c2c9b07b81fafda9122993f2e12 (git) Affected: 5.18.10 , < 5.19 (semver)
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)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mptcp/protocol.c",
            "net/mptcp/protocol.h",
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          ],
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        {
          "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:12:43.438Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5564be74a22a61855f8b8c100d8c4abb003bb792"
        },
        {
          "url": "https://git.kernel.org/stable/c/0f4f4cf5d32f10543deb946a37111e714579511e"
        },
        {
          "url": "https://git.kernel.org/stable/c/0a3f4f1f9c27215e4ddcd312558342e57b93e518"
        }
      ],
      "title": "mptcp: fix UaF in listener shutdown",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "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": "2026-08-05T09:12:43.438Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

Detection rules are retrieved from Rulezet.

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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