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CriticalFix available

ksmbd: ipc: fix use-after-free in ipc_msg_send_request

Type: advisorySources: OSV

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.

Products
Kernel
Affected versions
Not specified
Fixed versions
6.1.160, 6.12.62, 6.17.12, 6.18.1, 6.6.120
CVEs
CVE-2025-68263
Confirmed fixed CVEs
Not specified
Updated in this feed
8 Nov 2026, 00:37 UTC · Revision 1

Source evidence

ksmbd: ipc: fix use-after-free in ipc_msg_send_request

core-osv · Original source

Published 16 Dec 2025, 14:45 UTC

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.

osv:CVE-2025-68263

Kernel

Fixed versions: 6.1.160, 6.6.120, 6.12.62, 6.17.12, 6.18.1

Complete source record
{
  "id": "678a725dbbf23241df683029406cac4aa3c3c64802cfcbd01ae69c152b74a917",
  "url": "https://osv.dev/vulnerability/CVE-2025-68263",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2025-68263",
    "products": [
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          "value": "Kernel",
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        "prerequisites": [],
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          {
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            "evidence": "/affected/1/ranges"
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          {
            "value": "6.12.62",
            "evidence": "/affected/1/ranges"
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          {
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            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
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    "severity": "critical",
    "structured": {
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      "aliases": [
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
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            {
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            "ecosystem": "Linux"
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          "database_specific": {
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      ],
      "modified": "2026-10-28T02:30:52.582158716Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1fab1fa091f5aa97265648b53ea031deedd26235",
        "https://git.kernel.org/stable/c/5ac763713a1ef8f9a8bda1dbd81f0318d67baa4e",
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        "https://git.kernel.org/stable/c/759c8c30cfa8706c518e56f67971b1f0932f4b9b",
        "https://git.kernel.org/stable/c/8229c6ca50cea701e25a7ee25f48441b582ec5fa",
        "https://git.kernel.org/stable/c/de85fb58f9967ba024bb08e0041613d37b57b4d1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68263.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-68263",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68263.json"
      }
    },
    "related_cves": [
      {
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        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521026,
  "published_at": "2025-12-16T14:45:05.218+00:00"
}