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

Vulnerability from cvelistv5 – Published: 2025-12-16 14:45 – Updated: 2025-12-20 08:52
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 ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux 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: 6.12.62 , ≤ 6.12.* (semver)
Unaffected: 6.17.12 , ≤ 6.17.* (semver)
Unaffected: 6.18.1 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc1 , ≤ * (original_commit_for_fix)
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          "product": "Linux",
          "programFiles": [
            "fs/smb/server/transport_ipc.c"
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          "lang": "en",
          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-20T08:52:18.814Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/1fab1fa091f5aa97265648b53ea031deedd26235"
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      ],
      "title": "ksmbd: ipc: fix use-after-free in ipc_msg_send_request",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68263",
    "datePublished": "2025-12-16T14:45:05.218Z",
    "dateReserved": "2025-12-16T13:41:40.267Z",
    "dateUpdated": "2025-12-20T08:52:18.814Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68263\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-16T15:15:55.813\",\"lastModified\":\"2025-12-18T15:08:06.237\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1fab1fa091f5aa97265648b53ea031deedd26235\",\"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/759c8c30cfa8706c518e56f67971b1f0932f4b9b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8229c6ca50cea701e25a7ee25f48441b582ec5fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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