cxl/features: Reject Set Features output buffer smaller than the header
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.
CVE-2026-93078
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-93078
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "eb5dfcb9e36d0e46089fec777d911313c1876fa3",
"lessThan": "1281dc84c81577b51e2b61c24617c9f44b2cdb99",
"versionType": "git"
},
{
"status": "affected",
"version": "eb5dfcb9e36d0e46089fec777d911313c1876fa3",
"lessThan": "16b7c99eff030c6ea11ca24efa4b9f989cc74093",
"versionType": "git"
},
{
"status": "affected",
"version": "eb5dfcb9e36d0e46089fec777d911313c1876fa3",
"lessThan": "cde18d6c1d913a67ab0afd3d9475ece4be79da50",
"versionType": "git"
}
],
"programFiles": [
"drivers/cxl/core/features.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/cxl/core/features.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93078
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #37813 · Revision 1
- Added to Heist Feed
- Publisher date