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

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2025-68263
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-16 15:15:55 UTC
Updated2026-04-02 09:16:19 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0626e6641f6b467447c81dd7678a69c66f7746cf de85fb58f9967ba024bb08e0041613d37b57b4d1 git Not specified
CNA Linux Linux affected 0626e6641f6b467447c81dd7678a69c66f7746cf 708a620b471a14466f1f52c90bf3f65ebdb31460 git Not specified
CNA Linux Linux affected 0626e6641f6b467447c81dd7678a69c66f7746cf 5ac763713a1ef8f9a8bda1dbd81f0318d67baa4e git Not specified
CNA Linux Linux affected 0626e6641f6b467447c81dd7678a69c66f7746cf 759c8c30cfa8706c518e56f67971b1f0932f4b9b git Not specified
CNA Linux Linux affected 0626e6641f6b467447c81dd7678a69c66f7746cf 8229c6ca50cea701e25a7ee25f48441b582ec5fa git Not specified
CNA Linux Linux affected 0626e6641f6b467447c81dd7678a69c66f7746cf 1fab1fa091f5aa97265648b53ea031deedd26235 git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 6.1.160 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.120 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.62 6.12.* semver Not specified
CNA Linux Linux unaffected 6.17.12 6.17.* semver Not specified
CNA Linux Linux unaffected 6.18.1 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/de85fb58f9967ba024bb08e0041613d37b57b4d1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/759c8c30cfa8706c518e56f67971b1f0932f4b9b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1fab1fa091f5aa97265648b53ea031deedd26235 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/708a620b471a14466f1f52c90bf3f65ebdb31460 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5ac763713a1ef8f9a8bda1dbd81f0318d67baa4e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8229c6ca50cea701e25a7ee25f48441b582ec5fa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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