CVE-2026-31538
HighSummary
W jądrze systemu Linux zidentyfikowano podatność związaną z zarządzaniem kredytami odbioru w protokole SMB. Problem polega na wyścigu w logice liczenia kredytów, co może prowadzić do przyznawania nieistniejących kredytów.
Risk Assessment
Organizacje mogą być narażone na problemy z wydajnością i stabilnością serwera SMB, co może prowadzić do zakłóceń w komunikacji i potencjalnych utrat danych.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, aby usunąć tę podatność i poprawić zarządzanie kredytami w protokole SMB.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: smb: server: make use of smbdirect_socket.recv_io.credits.available The logic off managing recv credits by counting posted recv_io and granted credits is racy. That's because the peer might already consumed a credit, but between receiving the incoming recv at the hardware and processing the completion in the 'recv_done' functions we likely have a window where we grant credits, which don't really exist. So we better have a decicated counter for the available credits, which will be incremented when we posted new recv buffers and drained when we grant the credits to the peer. This fixes regression Namjae reported with the 6.18 release.

