{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98719","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:25:14.366Z","datePublished":"2026-10-18T15:46:54.631Z","dateUpdated":"2026-10-19T09:24:30.132Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-19T09:24:30.132Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SEV: Nullify \"have run CPUs\" mask pointer when freeing it\n\nNullify have_run_cpus when freeing the mask, particularly in the error path\nof __sev_guest_init(), so that KVM doesn't have to subtly use sev->active\nto track whether or not the mask has been freed.  As pointed out by Sashiko,\nblindly freeing the mask in sev_vm_destroy() results in a double-free if\nthe mask is freed if __sev_guest_init() fails.\n\nThrow the logic in a helper as nullifying the pointer is frustratingly\ndifficult and weird due to have_run_cpus being a single-entry array when\nCPUMASK_OFFSTACK=n.  Deliberately don't use CPUMASK_VAR_NULL, as it's not\ndirectly assignable when the cpumask is on-stack, e.g. requires using a\nlocal variable and a memcpy(), which is beyond ridiculous.  Furthermore,\nwhile clearing the on-stack bitmask is an unnecessary and arguably unwanted\nside effect, KVM absolutely relies on '0' being the \"null\" value given that\nthe struct is zero-allocated.\n\nOpportunistically add an alloc() helper to pair with free(); there are just\nenough call sites to make doing so worthwhile."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/svm/sev.c"],"versions":[{"version":"6aef7cf800098749ff5d660222efaf6e01e98c09","lessThan":"b1de3ebf59507e0edacaa5cfa2225bc1869e1b63","status":"affected","versionType":"git"},{"version":"9784e5ca91b37b387f3f414af4340c54f7a63566","lessThan":"0fbc7fec2242de6c3dcea6de55573c428e820173","status":"affected","versionType":"git"},{"version":"12c1f6e03f944e399bd2c88441dca5dc702b95a5","lessThan":"8abbc76120a74bfba1851bd97528099d715e45c6","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/svm/sev.c"],"versions":[{"version":"6.18.55","lessThan":"6.18.56","status":"affected","versionType":"semver"},{"version":"7.2.9","lessThan":"7.2.10","status":"affected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18.55","versionEndExcluding":"6.18.56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.2.9","versionEndExcluding":"7.2.10"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/b1de3ebf59507e0edacaa5cfa2225bc1869e1b63"},{"url":"https://git.kernel.org/stable/c/0fbc7fec2242de6c3dcea6de55573c428e820173"},{"url":"https://git.kernel.org/stable/c/8abbc76120a74bfba1851bd97528099d715e45c6"}],"title":"KVM: SEV: Nullify \"have run CPUs\" mask pointer when freeing it","x_generator":{"engine":"bippy-1.2.0"}}}}