ksmbd: ipc: fix use-after-free in ipc_msg_send_request
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.1.160, 6.6.120, 6.12.62, 6.17.12, 6.18.1
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: yes
- Technical impact: total
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From 0626e6641f6b467447c81dd7678a69c66f7746cf · fixed in de85fb58f9967ba024bb08e0041613d37b57b4d1; From 0626e6641f6b467447c81dd7678a69c66f7746cf · fixed in 708a620b471a14466f1f52c90bf3f65ebdb31460; From 0626e6641f6b467447c81dd7678a69c66f7746cf · fixed in 5ac763713a1ef8f9a8bda1dbd81f0318d67baa4e; From 0626e6641f6b467447c81dd7678a69c66f7746cf · fixed in 759c8c30cfa8706c518e56f67971b1f0932f4b9b; From 0626e6641f6b467447c81dd7678a69c66f7746cf · fixed in 8229c6ca50cea701e25a7ee25f48441b582ec5fa; From 0626e6641f6b467447c81dd7678a69c66f7746cf · fixed in 1fab1fa091f5aa97265648b53ea031deedd26235
- Linux Linux
5.15
- KernelLinux
From 5.15.0 · fixed in 6.1.160; From 6.2.0 · fixed in 6.6.120; From 6.7.0 · fixed in 6.12.62; From 6.13.0 · fixed in 6.17.12; From 6.18.0 · fixed in 6.18.1