KVM: arm64: Validate the SVE vector length in pkvm_vcpu_init_sve()
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Validate the SVE vector length in pkvm_vcpu_init_sve() pkvm_vcpu_init_sve() clamps only the upper bound of the host-provided sve_max_vl, so an invalid vector length reaches sve_state_size_from_vl() and the WARN_ON() there, which is fatal at EL2. The existing !sve_state_size test rejects such a length, but only after the macro has run. Check sve_vl_valid() before deriving the state size. A valid length cannot yield a zero size, so the !sve_state_size test goes with it.
CVE-2026-98638
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-2026-98638
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": "5db1bef933427aa467ad89c7b695a84a6b4afe16",
"lessThan": "faf66e55e87498ab4bf88cdf9a629e61b3f2d3bc",
"versionType": "git"
},
{
"status": "affected",
"version": "5db1bef933427aa467ad89c7b695a84a6b4afe16",
"lessThan": "bae3e4493046de4fefa15f809d9b8dc114e84a3d",
"versionType": "git"
},
{
"status": "affected",
"version": "5db1bef933427aa467ad89c7b695a84a6b4afe16",
"lessThan": "2a2eb10795a1e495aebc7f829ccecb72c05b4fd9",
"versionType": "git"
}
],
"programFiles": [
"arch/arm64/kvm/hyp/nvhe/pkvm.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.55",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/arm64/kvm/hyp/nvhe/pkvm.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98638
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38658 · Revision 1
- Added to Heist Feed
- Publisher date