In the Linux kernel, the following vulnerability has been resolved: cxl/features: Reject Get Feature count larger than the output buffer… (CVE-2026-93079)
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.
In the Linux kernel, the following vulnerability has been resolved: cxl/features: Reject Get Feature count larger than the output buffer… (CVE-2026-93079)
Description
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 v3.1
Score 7.8high
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-6wmr-43p3-p5m9
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-93079"]
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6aade51955bf5e2cf5edc041
Added to database: 09/19/2026, 01:27:53 UTC
Last updated: 09/19/2026, 01:27:53 UTC
Views: 1
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