cxl/features: Reject Set Features output buffer smaller than the header

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93078
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:18:01 UTC
Updated2026-09-17 17:18:01 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001980000 probability, percentile 0.098680000 (date 2026-09-18)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected eb5dfcb9e36d0e46089fec777d911313c1876fa3 1281dc84c81577b51e2b61c24617c9f44b2cdb99 git Not specified
CNA Linux Linux affected eb5dfcb9e36d0e46089fec777d911313c1876fa3 16b7c99eff030c6ea11ca24efa4b9f989cc74093 git Not specified
CNA Linux Linux affected eb5dfcb9e36d0e46089fec777d911313c1876fa3 cde18d6c1d913a67ab0afd3d9475ece4be79da50 git Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/16b7c99eff030c6ea11ca24efa4b9f989cc74093 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cde18d6c1d913a67ab0afd3d9475ece4be79da50 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1281dc84c81577b51e2b61c24617c9f44b2cdb99 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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