CVE-2026-23427
CriticalSummary
W jądrze systemu Linux zidentyfikowano podatność związana z użyciem po zwolnieniu pamięci (use-after-free) w kontekście DURABLE_REQ_V2, co może prowadzić do dereferencji nieaktualnego wskaźnika. Problem występuje w funkcji parse_durable_handle_context(), która niepoprawnie przypisuje połączenie do aktywnych uchwytów plików.
Risk Assessment
Podatność ta może prowadzić do poważnych problemów z stabilnością systemu, w tym do potencjalnego wycieku pamięci lub awarii aplikacji korzystających z ksmbd. Może to wpłynąć na dostępność usług w organizacji.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, w której ta podatność została naprawiona, aby zminimalizować ryzyko związane z użyciem po zwolnieniu pamięci.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in durable v2 replay of active file handles parse_durable_handle_context() unconditionally assigns dh_info->fp->conn to the current connection when handling a DURABLE_REQ_V2 context with SMB2_FLAGS_REPLAY_OPERATION. ksmbd_lookup_fd_cguid() does not filter by fp->conn, so it returns file handles that are already actively connected. The unconditional overwrite replaces fp->conn, and when the overwriting connection is subsequently freed, __ksmbd_close_fd() dereferences the stale fp->conn via spin_lock(&fp->conn->llist_lock), causing a use-after-free. KASAN report: [ 7.349357] ================================================================== [ 7.349607] BUG: KASAN: slab-use-after-free in _raw_spin_lock+0x75/0xe0 [ 7.349811] Write of size 4 at addr ffff8881056ac18c by task kworker/1:2/108 [ 7.350010] [ 7.350064] CPU: 1 UID: 0 PID: 108 Comm: kworker/1:2 Not tainted 7.0.0-rc3+ #58
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

