{"id":"CVE-2021-47228","state":"PUBLISHED","title":"x86/ioremap: Map EFI-reserved memory as encrypted for SEV","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/ioremap: Map EFI-reserved memory as encrypted for SEV\n\nSome drivers require memory that is marked as EFI boot services\ndata. In order for this memory to not be re-used by the kernel\nafter ExitBootServices(), efi_mem_reserve() is used to preserve it\nby inserting a new EFI memory descriptor and marking it with the\nEFI_MEMORY_RUNTIME attribute.\n\nUnder SEV, memory marked with the EFI_MEMORY_RUNTIME attribute needs to\nbe mapped encrypted by Linux, otherwise the kernel might crash at boot\nlike below:\n\n  EFI Variables Facility v0.08 2004-May-17\n  general protection fault, probably for non-canonical address 0x3597688770a868b2: 0000 [#1] SMP NOPTI\n  CPU: 13 PID: 1 Comm: swapper/0 Not tainted 5.12.4-2-default #1 openSUSE Tumbleweed\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n  RIP: 0010:efi_mokvar_entry_next\n  [...]\n  Call Trace:\n   efi_mokvar_sysfs_init\n   ? efi_mokvar_table_init\n   do_one_initcall\n   ? __kmalloc\n   kernel_init_freeable\n   ? rest_init\n   kernel_init\n   ret_from_fork\n\nExpand the __ioremap_check_other() function to additionally check for\nthis other type of boot data reserved at runtime and indicate that it\nshould be mapped encrypted for an SEV guest.\n\n [ bp: Massage commit message. ]","publishedAt":"2024-05-21T14:19:32.167Z","updatedAt":"2026-05-11T13:50:26.392Z","severity":{"score":6.2,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5","status":"affected","lessThan":"208bb686e7fa7fff16e8fa78ff0db34aa9acdbd7","versionType":"git"},{"version":"58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5","status":"affected","lessThan":"b7a05aba39f733ec337c5b952e112dd2dc4fc404","versionType":"git"},{"version":"58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5","status":"affected","lessThan":"8d651ee9c71bb12fc0c8eb2786b66cbe5aa3e43b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/mm/ioremap.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.10","versionType":"semver"},{"version":"5.10.46","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.12.13","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/mm/ioremap.c"]}],"references":["https://git.kernel.org/stable/c/208bb686e7fa7fff16e8fa78ff0db34aa9acdbd7","https://git.kernel.org/stable/c/b7a05aba39f733ec337c5b952e112dd2dc4fc404","https://git.kernel.org/stable/c/8d651ee9c71bb12fc0c8eb2786b66cbe5aa3e43b"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47228.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47228","state":"PUBLISHED","datePublished":"2024-05-21T14:19:32.167Z","dateUpdated":"2026-05-11T13:50:26.392Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-04-10T18:59:19.530Z"},"containers":{"cna":{"title":"x86/ioremap: Map EFI-reserved memory as encrypted for SEV","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/ioremap: Map EFI-reserved memory as encrypted for SEV\n\nSome drivers require memory that is marked as EFI boot services\ndata. In order for this memory to not be re-used by the kernel\nafter ExitBootServices(), efi_mem_reserve() is used to preserve it\nby inserting a new EFI memory descriptor and marking it with the\nEFI_MEMORY_RUNTIME attribute.\n\nUnder SEV, memory marked with the EFI_MEMORY_RUNTIME attribute needs to\nbe mapped encrypted by Linux, otherwise the kernel might crash at boot\nlike below:\n\n  EFI Variables Facility v0.08 2004-May-17\n  general protection fault, probably for non-canonical address 0x3597688770a868b2: 0000 [#1] SMP NOPTI\n  CPU: 13 PID: 1 Comm: swapper/0 Not tainted 5.12.4-2-default #1 openSUSE Tumbleweed\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n  RIP: 0010:efi_mokvar_entry_next\n  [...]\n  Call Trace:\n   efi_mokvar_sysfs_init\n   ? efi_mokvar_table_init\n   do_one_initcall\n   ? __kmalloc\n   kernel_init_freeable\n   ? rest_init\n   kernel_init\n   ret_from_fork\n\nExpand the __ioremap_check_other() function to additionally check for\nthis other type of boot data reserved at runtime and indicate that it\nshould be mapped encrypted for an SEV guest.\n\n [ bp: Massage commit message. ]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5","status":"affected","lessThan":"208bb686e7fa7fff16e8fa78ff0db34aa9acdbd7","versionType":"git"},{"version":"58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5","status":"affected","lessThan":"b7a05aba39f733ec337c5b952e112dd2dc4fc404","versionType":"git"},{"version":"58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5","status":"affected","lessThan":"8d651ee9c71bb12fc0c8eb2786b66cbe5aa3e43b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/mm/ioremap.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.10","versionType":"semver"},{"version":"5.10.46","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.12.13","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/mm/ioremap.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/208bb686e7fa7fff16e8fa78ff0db34aa9acdbd7"},{"url":"https://git.kernel.org/stable/c/b7a05aba39f733ec337c5b952e112dd2dc4fc404"},{"url":"https://git.kernel.org/stable/c/8d651ee9c71bb12fc0c8eb2786b66cbe5aa3e43b"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T13:50:26.392Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.10.46"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.12.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10","versionEndExcluding":"5.13"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":6.2,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2024-05-31T18:49:28.730368Z","id":"CVE-2021-47228","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"type":"CWE","lang":"en","description":"CWE-noinfo Not enough information"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-10-31T14:37:11.006Z"}},{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/208bb686e7fa7fff16e8fa78ff0db34aa9acdbd7","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/b7a05aba39f733ec337c5b952e112dd2dc4fc404","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/8d651ee9c71bb12fc0c8eb2786b66cbe5aa3e43b","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T05:32:07.392Z"}}]}}}