Answer in brief
CVE-2026-31539 records a High severity (CVSS 7.5) vulnerability in smb: smbdirect: introduce smbdirect_socket.recv_io.credits.available. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=5fb9b459b3686e366640edd4e62805ef7b4de927 <e811e60e1cc79923c4388146eb1fa26a7482731e || >=5fb9b459b3686e366640edd4e62805ef7b4de927 <f99996870222b598914a1f49d7375dc23752c237 || >=5fb9b459b3686e366640edd4e62805ef7b4de927 <6e3c5052f9686192e178806e017b7377155f4bab | e811e60e1cc79923c4388146eb1fa26a7482731e, f99996870222b598914a1f49d7375dc23752c237, 6e3c5052f9686192e178806e017b7377155f4bab |
| Linux/Linuxgeneric | 6.18 | Not reported |
Published upstream
Apr 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 16, 2026
In the Linux kernel, the following vulnerability has been resolved: smb: smbdirect: introduce 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.
Quoted source text, attributed separately from HOL analysis.