KVM: arm64: Apply the fine-grained UNDEFs without FEAT_FGT
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Apply the fine-grained UNDEFs without FEAT_FGT FGUs don't actually require hardware support, so don't gate fgt trap config insertion on FGT. This is the only action required to allow FGUs always, as kvm_calculate_traps() already computes the FGU bits with or without FEAT_FGT. This also fixes a spurious WARN when a TLBI OS is run on a guest in vEL1 without FEAT_TLBIOS on non FEAT_FGT hardware. In this configuration the course-grained HCR_EL2.TTLBOS trap reaches the handler handle_tlbi_el1(), which expects an EL1 TLBI only from vEL2. With FGUs enabled the UNDEF will be injected without needing the specific handler. [oliver: Take Wei-Lin's suggested changelog]
CVE-2026-98713
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-2026-98713
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": "f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f",
"lessThan": "2f4a15c52a552c5244ec27f4ca8bda855594f918",
"versionType": "git"
},
{
"status": "affected",
"version": "f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f",
"lessThan": "1113374a17d7f7d16b02ee0bbd9b1e7a60cbb087",
"versionType": "git"
},
{
"status": "affected",
"version": "f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f",
"lessThan": "af3300b3a6bace925a496f3520e171c07b999c72",
"versionType": "git"
},
{
"status": "affected",
"version": "f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f",
"lessThan": "4bdd2b3a708c1feb701cb8b62feb8ad2fd77bb07",
"versionType": "git"
}
],
"programFiles": [
"arch/arm64/kvm/emulate-nested.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/arm64/kvm/emulate-nested.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98713
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38696 · Revision 1
- Added to Heist Feed
- Publisher date