{"id":"CVE-2021-28693","state":"PUBLISHED","title":"xen/arm: Boot modules are not scrubbed The bootloader will load boot modules (e.g. kernel, initramfs...) in a temporary area before they are copied by Xen to each domain memory. To","description":"xen/arm: Boot modules are not scrubbed The bootloader will load boot modules (e.g. kernel, initramfs...) in a temporary area before they are copied by Xen to each domain memory. To ensure sensitive data is not leaked from the modules, Xen must \"scrub\" them before handing the page over to the allocator. Unfortunately, it was discovered that modules will not be scrubbed on Arm.","publishedAt":"2021-06-30T10:32:26.000Z","updatedAt":"2024-08-03T21:47:33.196Z","severity":null,"assigner":"XEN","products":["Xen xen"],"affected":[{"vendor":"Xen","product":"xen","versions":[{"version":"4.15.x","status":"affected"}]},{"vendor":"Xen","product":"xen","versions":[{"version":"unspecified","status":"unknown","lessThan":"4.12","versionType":"custom"},{"version":"4.13.x","status":"affected","lessThan":"unspecified","versionType":"custom"},{"version":"next of 4.14.x","status":"unaffected","lessThan":"unspecified","versionType":"custom"}]},{"vendor":"Xen","product":"xen","versions":[{"version":"xen-unstable","status":"affected"}]},{"vendor":"Xen","product":"xen","versions":[{"version":"4.12.x","status":"affected"}]}],"references":["https://xenbits.xenproject.org/xsa/advisory-372.txt","https://security.gentoo.org/glsa/202107-30"],"weaknesses":[],"ingestedAt":"2026-10-29T19:48:19.096Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/28xxx/CVE-2021-28693.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-28693","state":"PUBLISHED","datePublished":"2021-06-30T10:32:26.000Z","dateUpdated":"2024-08-03T21:47:33.196Z","assignerShortName":"XEN","assignerOrgId":"23aa2041-22e1-471f-9209-9b7396fa234f","dateReserved":"2021-03-18T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"xen/arm: Boot modules are not scrubbed The bootloader will load boot modules (e.g. kernel, initramfs...) in a temporary area before they are copied by Xen to each domain memory. To ensure sensitive data is not leaked from the modules, Xen must \"scrub\" them before handing the page over to the allocator. Unfortunately, it was discovered that modules will not be scrubbed on Arm."}],"affected":[{"vendor":"Xen","product":"xen","versions":[{"version":"4.15.x","status":"affected"}]},{"vendor":"Xen","product":"xen","versions":[{"version":"unspecified","status":"unknown","lessThan":"4.12","versionType":"custom"},{"version":"4.13.x","status":"affected","lessThan":"unspecified","versionType":"custom"},{"version":"next of 4.14.x","status":"unaffected","lessThan":"unspecified","versionType":"custom"}]},{"vendor":"Xen","product":"xen","versions":[{"version":"xen-unstable","status":"affected"}]},{"vendor":"Xen","product":"xen","versions":[{"version":"4.12.x","status":"affected"}]}],"references":[{"url":"https://xenbits.xenproject.org/xsa/advisory-372.txt","tags":["x_refsource_MISC"]},{"url":"https://security.gentoo.org/glsa/202107-30","name":"GLSA-202107-30","tags":["vendor-advisory","x_refsource_GENTOO"]}],"metrics":[{"other":{"content":{"description":{"description_data":[{"lang":"eng","value":"Sensitive information from the boot modules might be visible to another\ndomain after boot."}]}},"type":"unknown"}}],"problemTypes":[{"descriptions":[{"description":"unknown","lang":"en","type":"text"}]}],"providerMetadata":{"shortName":"XEN","dateUpdated":"2021-07-12T04:06:37.000Z","orgId":"23aa2041-22e1-471f-9209-9b7396fa234f"},"credits":[{"lang":"en","value":"{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by Julien Grall of Amazon.'}]}}}"}],"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security@xen.org","ID":"CVE-2021-28693","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"xen","version":{"version_data":[{"version_value":"4.15.x"}]}},{"product_name":"xen","version":{"version_data":[{"version_affected":"?<","version_value":"4.12"},{"version_affected":">=","version_value":"4.13.x"},{"version_affected":"!>","version_value":"4.14.x"}]}},{"product_name":"xen","version":{"version_data":[{"version_value":"xen-unstable"}]}},{"product_name":"xen","version":{"version_data":[{"version_value":"4.12.x"}]}}]},"vendor_name":"Xen"}]}},"configuration":{"configuration_data":{"description":{"description_data":[{"lang":"eng","value":"Only Arm systems are vulnerable.  System running with \"bootscrub=off\"\n(disabling boot scrubbing) are not vulnerable.\n\nAll versions of Xen since 4.12 are vulnerable."}]}}},"credit":{"credit_data":{"description":{"description_data":[{"lang":"eng","value":"This issue was discovered by Julien Grall of Amazon."}]}}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"xen/arm: Boot modules are not scrubbed The bootloader will load boot modules (e.g. kernel, initramfs...) in a temporary area before they are copied by Xen to each domain memory. To ensure sensitive data is not leaked from the modules, Xen must \"scrub\" them before handing the page over to the allocator. Unfortunately, it was discovered that modules will not be scrubbed on Arm."}]},"impact":{"impact_data":{"description":{"description_data":[{"lang":"eng","value":"Sensitive information from the boot modules might be visible to another\ndomain after boot."}]}}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"unknown"}]}]},"references":{"reference_data":[{"name":"https://xenbits.xenproject.org/xsa/advisory-372.txt","refsource":"MISC","url":"https://xenbits.xenproject.org/xsa/advisory-372.txt"},{"name":"GLSA-202107-30","refsource":"GENTOO","url":"https://security.gentoo.org/glsa/202107-30"}]},"workaround":{"workaround_data":{"description":{"description_data":[{"lang":"eng","value":"There is no mitigation available."}]}}}}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://xenbits.xenproject.org/xsa/advisory-372.txt","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://security.gentoo.org/glsa/202107-30","name":"GLSA-202107-30","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T21:47:33.196Z"}}]}}}