{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-47255","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-04-10T18:59:19.539Z","datePublished":"2024-05-21T14:19:50.125Z","dateUpdated":"2025-05-04T07:07:14.476Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T07:07:14.476Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nkvm: LAPIC: Restore guard to prevent illegal APIC register access\n\nPer the SDM, \"any access that touches bytes 4 through 15 of an APIC\nregister may cause undefined behavior and must not be executed.\"\nWorse, such an access in kvm_lapic_reg_read can result in a leak of\nkernel stack contents. Prior to commit 01402cf81051 (\"kvm: LAPIC:\nwrite down valid APIC registers\"), such an access was explicitly\ndisallowed. Restore the guard that was removed in that commit."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/lapic.c"],"versions":[{"version":"01402cf81051f796dac7c60ca11d6147153ca46a","lessThan":"bf99ea52970caeb4583bdba1192c1f9b53b12c84","status":"affected","versionType":"git"},{"version":"01402cf81051f796dac7c60ca11d6147153ca46a","lessThan":"018685461a5b9a9a70e664ac77aef0d7415a3fd5","status":"affected","versionType":"git"},{"version":"01402cf81051f796dac7c60ca11d6147153ca46a","lessThan":"a2aff09807fbe4018c269d3773a629949058b210","status":"affected","versionType":"git"},{"version":"01402cf81051f796dac7c60ca11d6147153ca46a","lessThan":"218bf772bddd221489c38dde6ef8e917131161f6","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/lapic.c"],"versions":[{"version":"5.3","status":"affected"},{"version":"0","lessThan":"5.3","status":"unaffected","versionType":"semver"},{"version":"5.4.128","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.46","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.12.13","lessThanOrEqual":"5.12.*","status":"unaffected","versionType":"semver"},{"version":"5.13","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.4.128"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.10.46"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.12.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.13"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/bf99ea52970caeb4583bdba1192c1f9b53b12c84"},{"url":"https://git.kernel.org/stable/c/018685461a5b9a9a70e664ac77aef0d7415a3fd5"},{"url":"https://git.kernel.org/stable/c/a2aff09807fbe4018c269d3773a629949058b210"},{"url":"https://git.kernel.org/stable/c/218bf772bddd221489c38dde6ef8e917131161f6"}],"title":"kvm: LAPIC: Restore guard to prevent illegal APIC register access","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-47255","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-05-21T18:50:43.929512Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-06-04T17:14:17.935Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T05:32:07.995Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/bf99ea52970caeb4583bdba1192c1f9b53b12c84","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/018685461a5b9a9a70e664ac77aef0d7415a3fd5","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/a2aff09807fbe4018c269d3773a629949058b210","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/218bf772bddd221489c38dde6ef8e917131161f6","tags":["x_transferred"]}]}]}}