KVM: arm64: Apply the fine-grained UNDEFs without FEAT_FGT

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98713
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:24 UTC
Updated2026-10-19 10:19:35 UTC
DescriptionIn 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]

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f 2f4a15c52a552c5244ec27f4ca8bda855594f918 git Not specified
CNA Linux Linux affected f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f 1113374a17d7f7d16b02ee0bbd9b1e7a60cbb087 git Not specified
CNA Linux Linux affected f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f af3300b3a6bace925a496f3520e171c07b999c72 git Not specified
CNA Linux Linux affected f5a5a406b4b8bb6c1fc7a1e92a872bd86061a53f 4bdd2b3a708c1feb701cb8b62feb8ad2fd77bb07 git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.56 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.10 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4bdd2b3a708c1feb701cb8b62feb8ad2fd77bb07 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2f4a15c52a552c5244ec27f4ca8bda855594f918 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/af3300b3a6bace925a496f3520e171c07b999c72 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1113374a17d7f7d16b02ee0bbd9b1e7a60cbb087 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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