{"id":"CVE-2026-98713","published":"2026-10-18T16:17:24.857","lastModified":"2026-10-19T10:19:35.570","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Apply the fine-grained UNDEFs without FEAT_FGT\n\nFGUs don't actually require hardware support, so don't gate fgt trap\nconfig insertion on FGT. This is the only action required to allow FGUs\nalways, as kvm_calculate_traps() already computes the FGU bits with or\nwithout FEAT_FGT.\n\nThis also fixes a spurious WARN when a TLBI OS is run on a guest in vEL1\nwithout FEAT_TLBIOS on non FEAT_FGT hardware. In this configuration the\ncourse-grained HCR_EL2.TTLBOS trap reaches the handler handle_tlbi_el1(),\nwhich expects an EL1 TLBI only from vEL2. With FGUs enabled the UNDEF\nwill be injected without needing the specific handler.\n\n[oliver: Take Wei-Lin's suggested changelog]","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/1113374a17d7f7d16b02ee0bbd9b1e7a60cbb087","tags":[]},{"url":"https://git.kernel.org/stable/c/2f4a15c52a552c5244ec27f4ca8bda855594f918","tags":[]},{"url":"https://git.kernel.org/stable/c/4bdd2b3a708c1feb701cb8b62feb8ad2fd77bb07","tags":[]},{"url":"https://git.kernel.org/stable/c/af3300b3a6bace925a496f3520e171c07b999c72","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}