CVE-2026-93079cxl/features: Reject Get Feature count larger than the output buffer
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: cxl/features: Reject Get Feature count larger than the output buffer cxlctl_get_feature() sizes its output buffer from the user's fwctl_rpc.out_len, but the device is told to write cxl_mbox_get_feat_in.count bytes into rpc_out->payload, which is a separate user-controlled value. Nothing bounds count against out_len, so a small out_len with a large count overflows the kvzalloc()'d buffer. A heap OOB write reachable from FWCTL_RPC. Reject requests where count exceeds the available payload room, before allocating.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
- Received
- Record last updated
- Sep 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 5908f3ed6dc209e5c824e63afda7545805f75a7e builds before 3f02031a0a53de0d3ef066c92d0486b2b11be40c; 5908f3ed6dc209e5c824e63afda7545805f75a7e builds before 329ea475581c647a680a6937e353c1a6e2534b40; 5908f3ed6dc209e5c824e63afda7545805f75a7e builds before 4bf6bac375076ced2fa4b3fef8739bd985f93456 | CNA record |
References
- https://git.kernel.org/stable/c/3f02031a0a53de0d3ef066c92d0486b2b11be40c
- https://git.kernel.org/stable/c/329ea475581c647a680a6937e353c1a6e2534b40
- https://git.kernel.org/stable/c/4bf6bac375076ced2fa4b3fef8739bd985f93456
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.