CVE-2026-31539smb: smbdirect: introduce smbdirect_socket.recv_io.credits.available
Updated under an hour ago ()
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It affects Linux and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 5fb9b459b3686e366640edd4e62805ef7b4de927 before e811e60e1cc79923c4388146eb1fa26a7482731e; from 5fb9b459b3686e366640edd4e62805ef7b4de927 before f99996870222b598914a1f49d7375dc23752c237; from 5fb9b459b3686e366640edd4e62805ef7b4de927 before 6e3c5052f9686192e178806e017b7377155f4bab | CNA record |
linux linux_kernel linux:linux_kernel | from 6.18 before 6.18.11; from 6.19 before 6.19.1 | NVD |
References
- https://git.kernel.org/stable/c/e811e60e1cc79923c4388146eb1fa26a7482731epatch
- https://git.kernel.org/stable/c/f99996870222b598914a1f49d7375dc23752c237patch
- https://git.kernel.org/stable/c/6e3c5052f9686192e178806e017b7377155f4babpatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.