cxl/features: Serialize multi-part Get/Set Feature transfers
In the Linux kernel, the following vulnerability has been resolved: cxl/features: Serialize multi-part Get/Set Feature transfers A Get or Set Feature payload larger than the mailbox payload size is split into several mailbox commands. mbox_mutex only serializes individual mailbox commands and is dropped between iterations of these loops. Nothing serializes the multi-part transfer as a whole. cxl_get_feature() and cxl_set_feature() are reachable concurrently from fwctl (per-fd RPCs run under a read-held registration lock) and from the EDAC scrub/ECS/repair paths, so two transfers to the same mailbox can interleave their parts and corrupt the device's transfer context. Add a per-mailbox feat_mutex and hold it across the whole transfer in both functions. It nests outside mbox_mutex (which is taken inside cxl_internal_send_cmd()), and is taken nowhere else, so no lock-ordering inversion is introduced.
CVE-2026-93096
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-2026-93096
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": "5e5ac21f629de796ab5d598b59c5e468c6fe4f95",
"lessThan": "c6492e17412048387435f256ffafc4dd6518db28",
"versionType": "git"
},
{
"status": "affected",
"version": "5e5ac21f629de796ab5d598b59c5e468c6fe4f95",
"lessThan": "7682b617db1f19bc606b5f1badadcf1e63a87b14",
"versionType": "git"
},
{
"status": "affected",
"version": "5e5ac21f629de796ab5d598b59c5e468c6fe4f95",
"lessThan": "77b814c1832fde018c30357b4ec3fcdaa91a1c10",
"versionType": "git"
}
],
"programFiles": [
"drivers/cxl/core/features.c",
"drivers/cxl/core/mbox.c",
"include/cxl/mailbox.h"
],
"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": "6.18.57",
"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",
"drivers/cxl/core/mbox.c",
"include/cxl/mailbox.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93096
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #37824 · Revision 1
- Added to Heist Feed
- Publisher date