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CVE-2026-98070

WysokieCVSS 8.1
Opublikowano: Zaktualizowano: Przetłumaczono: NVD NIST

Streszczenie

W jądrze Linux naprawiono podatność w module net/rds. Funkcja rds_tcp_reset_callbacks() wyciszała ścieżkę transmisji, oczekując na zwolnienie flagi RDS_IN_XMIT, zamiast przejąć blokadę, co na architekturach ze słabym uporządkowaniem pamięci mogło prowadzić do równoczesnego działania transmisji i resetu stanu cp_xmit_*.

Ocena ryzyka

W wyniku wyścigu (race condition) ścieżka transmisji może działać równolegle z rds_send_path_reset(), co prowadzi do uszkodzenia stanu połączenia RDS i potencjalnej destabilizacji systemu. Podatność dotyczy systemów z włączonym protokołem RDS w jądrze Linux.

Rekomendacja

Zaktualizuj jądro Linux do wersji zawierającej poprawkę dla CVE-2026-98070. Jeśli RDS nie jest używany, rozważ wyłączenie tego modułu, aby ograniczyć powierzchnię ataku.

Inne podatności w Linux kernel

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Oryginalny opis (angielski, źródło NVD)

In the Linux kernel, the following vulnerability has been resolved: net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks() rds_tcp_reset_callbacks() quiesces the transmit path by setting the path state to RDS_CONN_RESETTING and then waiting for RDS_IN_XMIT to be sampled clear before swapping the underlying socket and calling rds_send_path_reset(). Sampling the bit clear is not the same as owning it: rds_send_xmit() can re-acquire RDS_IN_XMIT right after the wait_event() returns. Its state recheck after taking the lock is a store-buffering pattern (the resetter writes the state and reads the bit, the sender writes the bit and reads the state) and acquire_in_xmit() is only an acquire operation, so on weakly ordered architectures both sides can miss each other's write and the transmit path then runs concurrently with rds_send_path_reset() rewriting cp_xmit_* state - which is exactly what the comment above rds_send_path_reset() tells its callers to prevent. Take the lock instead, hold it across the socket swap and rds_send_path_reset(), and release it with a wake-up at the end. The lock-ordering constraint documented above the wait still holds: the lock is acquired before lock_sock(), so a sender inside tcp_sendmsg() can never be waited on while we hold the socket lock. Two details of the old code go away with the same change: - t_sock is now read only after the lock is acquired. The old code cached it before waiting; the teardown in rds_conn_shutdown() releases that socket and clears t_sock, so a pointer cached before the wait can be stale by the time the accept path resumes. Reading it under RDS_IN_XMIT is what makes the exclusion complete once the teardown owns the same lock, which the next patch arranges; until then the teardown still only samples the bit, and the two paths remain as exposed to each other as they are today. - The old !osock early path called rds_send_path_reset() with no serialization at all. It now runs under the lock like the normal path. The conditional RDS_CONN_RESETTING transition of the previous patch happens before the socket check either way: a path found without a socket is either still connecting (its reconnect worker blocked on t_conn_path_lock) and legitimately goes RESETTING -> UP on the new socket, or it has been torn down meanwhile and is dropped. The in-function comment describing the old wait-based quiesce is rewritten to describe the lock-based one, and the stale block comment above the function (which still described a return value and an incomplete list of t_sock writers) is refreshed to name all four writers - the connect, accept, teardown and swap paths - and what serializes each of them.

Dane podatności pochodzą z NVD (NIST) · CISA KEV · EPSS