arm_mpam: Disable driver unbind to avoid UAF
In the Linux kernel, the following vulnerability has been resolved: arm_mpam: Disable driver unbind to avoid UAF When a user unbinds an MSC and that MSC is the only MSC left for a component then the corresponding mpam_component will be freed. If the user then goes on to read the schemata file in the resctrl filesystem then the mpam_component will be accessed from resctrl_arch_get_config() leading to a use after free. As the MPAM driver is not a module the unbind sysfs interface is the only way to trigger the remove. Instead of dealing with the complexity of allowing some unused MSC to unbind just remove the unbind sysfs interface.
CVE-2026-90270
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-2026-90270
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": "f04046f2577a5c76167333ca99d3903ee5331ba0",
"lessThan": "7d199b6a0651abad3ca6d0877dbedbe8fe6ea9e2",
"versionType": "git"
},
{
"status": "affected",
"version": "f04046f2577a5c76167333ca99d3903ee5331ba0",
"lessThan": "bb1a0f582d519c0461b0940116e2b52c5ba31459",
"versionType": "git"
}
],
"programFiles": [
"drivers/resctrl/mpam_devices.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/resctrl/mpam_devices.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90270
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #36629 · Revision 1
- Added to Heist Feed
- Publisher date