What’s Vulnerable › Vulnerabilities

CVE-2026-93078: cxl/features: Reject Set Features output buffer smaller than the header

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: cxl/features: Reject Set Features output buffer smaller than the header cxlctl_set_feature() sizes its output buffer from the user's fwctl_rpc.out_len but never checks it is large enough to hold even the fwctl_rpc_cxl_out header. With out_len == 0 , kvzalloc() returns ZERO_SIZE_PTR, which passes the !rpc_out check, the subsequent rpc_out->size = 0 then writes through the poison pointer. Reject requests whose output buffer can't hold the response header, before allocating. The Set Feature reply carries no payload, so the header is all that is required.

Affected products

• Linux kernel: 6.15 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1281dc84c81577b51e2b61c24617c9f44b2cdb99
• https://git.kernel.org/stable/c/16b7c99eff030c6ea11ca24efa4b9f989cc74093
• https://git.kernel.org/stable/c/cde18d6c1d913a67ab0afd3d9475ece4be79da50

Get alerted when CVE-2026-93078 or the next vulnerability affects your stack