iommu/amd: move wait_on_sem() out of spinlock
In the Linux kernel, the following vulnerability has been resolved: iommu/amd: move wait_on_sem() out of spinlock With iommu.strict=1, the existing completion wait path can cause soft lockups under stressed environment, as wait_on_sem() busy-waits under the spinlock with interrupts disabled. Move the completion wait in iommu_completion_wait() out of the spinlock. wait_on_sem() only polls the hardware-updated cmd_sem and does not require iommu->lock, so holding the lock during the busy wait unnecessarily increases contention and extends the time with interrupts disabled.
CVE-2026-43253
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-2026-43253
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": "4bf5beef578e46393f11eb69dda7d17a065e05ff",
"lessThan": "f2f65b28d802a667119147444ec2ae33eebf9a58",
"versionType": "git"
},
{
"status": "affected",
"version": "4bf5beef578e46393f11eb69dda7d17a065e05ff",
"lessThan": "715c263119fd1b918a9fcbd8a36ea5b604a46324",
"versionType": "git"
},
{
"status": "affected",
"version": "4bf5beef578e46393f11eb69dda7d17a065e05ff",
"lessThan": "e15768e68820142077bbca402d8e902f64ade1b0",
"versionType": "git"
},
{
"status": "affected",
"version": "4bf5beef578e46393f11eb69dda7d17a065e05ff",
"lessThan": "496269d12072ecb219826485bdbec70c92a8eef5",
"versionType": "git"
},
{
"status": "affected",
"version": "4bf5beef578e46393f11eb69dda7d17a065e05ff",
"lessThan": "d2a0cac10597068567d336e85fa3cbdbe8ca62bf",
"versionType": "git"
}
],
"programFiles": [
"drivers/iommu/amd/iommu.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.128",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.75",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.16",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.6",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/iommu/amd/iommu.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43253
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40050 · Revision 1
- Added to Heist Feed
- Publisher date