CVE-2025-68263 (GCVE-0-2025-68263)

Vulnerability from cvelistv5 – Published: 2025-12-16 14:45 – Updated: 2026-10-15 22:02
VLAI
Title
ksmbd: ipc: fix use-after-free in ipc_msg_send_request
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: ipc: fix use-after-free in ipc_msg_send_request ipc_msg_send_request() waits for a generic netlink reply using an ipc_msg_table_entry on the stack. The generic netlink handler (handle_generic_event()/handle_response()) fills entry->response under ipc_msg_table_lock, but ipc_msg_send_request() used to validate and free entry->response without holding the same lock. Under high concurrency this allows a race where handle_response() is copying data into entry->response while ipc_msg_send_request() has just freed it, leading to a slab-use-after-free reported by KASAN in handle_generic_event(): BUG: KASAN: slab-use-after-free in handle_generic_event+0x3c4/0x5f0 [ksmbd] Write of size 12 at addr ffff888198ee6e20 by task pool/109349 ... Freed by task: kvfree ipc_msg_send_request [ksmbd] ksmbd_rpc_open -> ksmbd_session_rpc_open [ksmbd] Fix by: - Taking ipc_msg_table_lock in ipc_msg_send_request() while validating entry->response, freeing it when invalid, and removing the entry from ipc_msg_table. - Returning the final entry->response pointer to the caller only after the hash entry is removed under the lock. - Returning NULL in the error path, preserving the original API semantics. This makes all accesses to entry->response consistent with handle_response(), which already updates and fills the response buffer under ipc_msg_table_lock, and closes the race that allowed the UAF.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 22:00 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < de85fb58f9967ba024bb08e0041613d37b57b4d1 (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 708a620b471a14466f1f52c90bf3f65ebdb31460 (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 5ac763713a1ef8f9a8bda1dbd81f0318d67baa4e (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 759c8c30cfa8706c518e56f67971b1f0932f4b9b (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 8229c6ca50cea701e25a7ee25f48441b582ec5fa (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 1fab1fa091f5aa97265648b53ea031deedd26235 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.62 , ≤ 6.12.* (semver)
Unaffected: 6.17.12 , ≤ 6.17.* (semver)
Unaffected: 6.18.1 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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              "value": "ksmbd IPC message use-after-free. The race in ipc_msg_send_request() is reachable from ksmbd_ipc_login_request() called during SESSION_SETUP before password verification. Two concurrent SESSION_SETUP requests with any username trigger concurrent IPC calls that race. No valid credentials needed, both sides attacker-controlled."
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: ipc: fix use-after-free in ipc_msg_send_request\n\nipc_msg_send_request() waits for a generic netlink reply using an\nipc_msg_table_entry on the stack. The generic netlink handler\n(handle_generic_event()/handle_response()) fills entry-\u003eresponse under\nipc_msg_table_lock, but ipc_msg_send_request() used to validate and free\nentry-\u003eresponse without holding the same lock.\n\nUnder high concurrency this allows a race where handle_response() is\ncopying data into entry-\u003eresponse while ipc_msg_send_request() has just\nfreed it, leading to a slab-use-after-free reported by KASAN in\nhandle_generic_event():\n\n  BUG: KASAN: slab-use-after-free in handle_generic_event+0x3c4/0x5f0 [ksmbd]\n  Write of size 12 at addr ffff888198ee6e20 by task pool/109349\n  ...\n  Freed by task:\n    kvfree\n    ipc_msg_send_request [ksmbd]\n    ksmbd_rpc_open -\u003e ksmbd_session_rpc_open [ksmbd]\n\nFix by:\n- Taking ipc_msg_table_lock in ipc_msg_send_request() while validating\n  entry-\u003eresponse, freeing it when invalid, and removing the entry from\n  ipc_msg_table.\n- Returning the final entry-\u003eresponse pointer to the caller only after\n  the hash entry is removed under the lock.\n- Returning NULL in the error path, preserving the original API\n  semantics.\n\nThis makes all accesses to entry-\u003eresponse consistent with\nhandle_response(), which already updates and fills the response buffer\nunder ipc_msg_table_lock, and closes the race that allowed the UAF."
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            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nksmbd: ipc: correcci\u00f3n de uso despu\u00e9s de liberaci\u00f3n en ipc_msg_send_request\n\nipc_msg_send_request() espera una respuesta gen\u00e9rica de netlink utilizando una entrada ipc_msg_table_entry en la pila. El gestor gen\u00e9rico de netlink (handle_generic_event()/handle_response()) rellena entry -\u003e response bajo ipc_msg_table_lock, pero ipc_msg_send_request() sol\u00eda validar y liberar entry -\u003e response sin mantener el mismo bloqueo.\n\nBajo alta concurrencia, esto permite una condici\u00f3n de carrera donde handle_response() est\u00e1 copiando datos en entry -\u003e response mientras ipc_msg_send_request() acaba de liberarlo, lo que lleva a un uso despu\u00e9s de liberaci\u00f3n de slab reportado por KASAN en handle_generic_event():\n\n  BUG: KASAN: slab-use-after-free in handle_generic_event+0x3c4/0x5f0 [ksmbd]\n  Write of size 12 at addr ffff888198ee6e20 by task pool/109349\n  ...\n  Freed by task:\n    kvfree\n    ipc_msg_send_request [ksmbd]\n    ksmbd_rpc_open  -\u003e  ksmbd_session_rpc_open [ksmbd]\n\nSoluci\u00f3n mediante:\n- Tomando ipc_msg_table_lock en ipc_msg_send_request() mientras se valida entry -\u003e response, liber\u00e1ndolo cuando es inv\u00e1lido y eliminando la entrada de ipc_msg_table.\n- Devolviendo el puntero final entry -\u003e response al llamador solo despu\u00e9s de que la entrada hash sea eliminada bajo el bloqueo.\n- Devolviendo NULL en la ruta de error, preservando la sem\u00e1ntica original de la API.\n\nEsto hace que todos los accesos a entry -\u003e response sean consistentes con handle_response(), que ya actualiza y rellena el b\u00fafer de respuesta bajo ipc_msg_table_lock, y cierra la condici\u00f3n de carrera que permit\u00eda el UAF."
          }
        ],
        "id": "CVE-2025-68263",
        "lastModified": "2026-10-15T22:19:11.140",
        "metrics": {
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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              "type": "Secondary"
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                "role": "CISA Coordinator",
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        "published": "2025-12-16T15:15:55.813",
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            "url": "https://git.kernel.org/stable/c/1fab1fa091f5aa97265648b53ea031deedd26235"
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5ac763713a1ef8f9a8bda1dbd81f0318d67baa4e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/708a620b471a14466f1f52c90bf3f65ebdb31460"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/759c8c30cfa8706c518e56f67971b1f0932f4b9b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8229c6ca50cea701e25a7ee25f48441b582ec5fa"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/de85fb58f9967ba024bb08e0041613d37b57b4d1"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-13T17:35:08+00:00",
      "cve": "CVE-2025-68263",
      "id": "CVE-2025-68263",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel ksmbd: Use-after-free vulnerability allows arbitrary code execution",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68263.json",
      "version": "3"
    }
  }
}



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