CVE-2021-47229

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47229", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-04-10T18:59:19.530Z", "datePublished": "2024-05-21T14:19:32.995Z", "dateUpdated": "2026-05-11T13:50:27.543Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T13:50:27.543Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: aardvark: Fix kernel panic during PIO transfer\n\nTrying to start a new PIO transfer by writing value 0 in PIO_START register\nwhen previous transfer has not yet completed (which is indicated by value 1\nin PIO_START) causes an External Abort on CPU, which results in kernel\npanic:\n\n SError Interrupt on CPU0, code 0xbf000002 -- SError\n Kernel panic - not syncing: Asynchronous SError Interrupt\n\nTo prevent kernel panic, it is required to reject a new PIO transfer when\nprevious one has not finished yet.\n\nIf previous PIO transfer is not finished yet, the kernel may issue a new\nPIO request only if the previous PIO transfer timed out.\n\nIn the past the root cause of this issue was incorrectly identified (as it\noften happens during link retraining or after link down event) and special\nhack was implemented in Trusted Firmware to catch all SError events in EL3,\nto ignore errors with code 0xbf000002 and not forwarding any other errors\nto kernel and instead throw panic from EL3 Trusted Firmware handler.\n\nLinks to discussion and patches about this issue:\nhttps://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/commit/?id=3c7dcdac5c50\nhttps://lore.kernel.org/linux-pci/20190316161243.29517-1-repk@triplefau.lt/\nhttps://lore.kernel.org/linux-pci/971be151d24312cc533989a64bd454b4@www.loen.fr/\nhttps://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/1541\n\nBut the real cause was the fact that during link retraining or after link\ndown event the PIO transfer may take longer time, up to the 1.44s until it\ntimes out. This increased probability that a new PIO transfer would be\nissued by kernel while previous one has not finished yet.\n\nAfter applying this change into the kernel, it is possible to revert the\nmentioned TF-A hack and SError events do not have to be caught in TF-A EL3."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/pci/controller/pci-aardvark.c"], "versions": [{"version": "8c39d710363c14ecb09219332869707395d1d495", "lessThan": "400e6b1860c8be61388d0b77814c53260f96e17a", "status": "affected", "versionType": "git"}, {"version": "8c39d710363c14ecb09219332869707395d1d495", "lessThan": "b00a9aaa4be20ad6e3311fb78a485eae0899e89a", "status": "affected", "versionType": "git"}, {"version": "8c39d710363c14ecb09219332869707395d1d495", "lessThan": "4c90f90a91d75c3c73dd633827c90e8746d9f54d", "status": "affected", "versionType": "git"}, {"version": "8c39d710363c14ecb09219332869707395d1d495", "lessThan": "1a1dbc4473974867fe8c5f195c17b341c8e82867", "status": "affected", "versionType": "git"}, {"version": "8c39d710363c14ecb09219332869707395d1d495", "lessThan": "3d213a4ddf49a860be6e795482c17f87e0c82b2a", "status": "affected", "versionType": "git"}, {"version": "8c39d710363c14ecb09219332869707395d1d495", "lessThan": "f18139966d072dab8e4398c95ce955a9742e04f7", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/pci/controller/pci-aardvark.c"], "versions": [{"version": "4.8", "status": "affected"}, {"version": "0", "lessThan": "4.8", "status": "unaffected", "versionType": "semver"}, {"version": "4.14.240", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "4.19.198", "lessThanOrEqual": "4.19.*", "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": "4.8", "versionEndExcluding": "4.14.240"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "4.19.198"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "5.4.128"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "5.10.46"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "5.12.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "5.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/400e6b1860c8be61388d0b77814c53260f96e17a"}, {"url": "https://git.kernel.org/stable/c/b00a9aaa4be20ad6e3311fb78a485eae0899e89a"}, {"url": "https://git.kernel.org/stable/c/4c90f90a91d75c3c73dd633827c90e8746d9f54d"}, {"url": "https://git.kernel.org/stable/c/1a1dbc4473974867fe8c5f195c17b341c8e82867"}, {"url": "https://git.kernel.org/stable/c/3d213a4ddf49a860be6e795482c17f87e0c82b2a"}, {"url": "https://git.kernel.org/stable/c/f18139966d072dab8e4398c95ce955a9742e04f7"}], "title": "PCI: aardvark: Fix kernel panic during PIO transfer", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:07.485Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/400e6b1860c8be61388d0b77814c53260f96e17a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/b00a9aaa4be20ad6e3311fb78a485eae0899e89a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/4c90f90a91d75c3c73dd633827c90e8746d9f54d", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/1a1dbc4473974867fe8c5f195c17b341c8e82867", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/3d213a4ddf49a860be6e795482c17f87e0c82b2a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/f18139966d072dab8e4398c95ce955a9742e04f7", "tags": ["x_transferred"]}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47229", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T15:40:07.082341Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:33:12.955Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/400e6b1860c8be61388d0b77814c53260f96e17a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/b00a9aaa4be20ad6e3311fb78a485eae0899e89a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/4c90f90a91d75c3c73dd633827c90e8746d9f54d", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/1a1dbc4473974867fe8c5f195c17b341c8e82867", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/3d213a4ddf49a860be6e795482c17f87e0c82b2a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/f18139966d072dab8e4398c95ce955a9742e04f7", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:07.485Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47229", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T15:40:07.082341Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T12:42:15.411Z"}}], "cna": {"title": "PCI: aardvark: Fix kernel panic during PIO transfer", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "8c39d710363c14ecb09219332869707395d1d495", "lessThan": "400e6b1860c8be61388d0b77814c53260f96e17a", "versionType": "git"}, {"status": "affected", "version": "8c39d710363c14ecb09219332869707395d1d495", "lessThan": "b00a9aaa4be20ad6e3311fb78a485eae0899e89a", "versionType": "git"}, {"status": "affected", "version": "8c39d710363c14ecb09219332869707395d1d495", "lessThan": "4c90f90a91d75c3c73dd633827c90e8746d9f54d", "versionType": "git"}, {"status": "affected", "version": "8c39d710363c14ecb09219332869707395d1d495", "lessThan": "1a1dbc4473974867fe8c5f195c17b341c8e82867", "versionType": "git"}, {"status": "affected", "version": "8c39d710363c14ecb09219332869707395d1d495", "lessThan": "3d213a4ddf49a860be6e795482c17f87e0c82b2a", "versionType": "git"}, {"status": "affected", "version": "8c39d710363c14ecb09219332869707395d1d495", "lessThan": "f18139966d072dab8e4398c95ce955a9742e04f7", "versionType": "git"}], "programFiles": ["drivers/pci/controller/pci-aardvark.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.8"}, {"status": "unaffected", "version": "0", "lessThan": "4.8", "versionType": "semver"}, {"status": "unaffected", "version": "4.14.240", "versionType": "semver", "lessThanOrEqual": "4.14.*"}, {"status": "unaffected", "version": "4.19.198", "versionType": "semver", "lessThanOrEqual": "4.19.*"}, {"status": "unaffected", "version": "5.4.128", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.46", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.12.13", "versionType": "semver", "lessThanOrEqual": "5.12.*"}, {"status": "unaffected", "version": "5.13", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/pci/controller/pci-aardvark.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/400e6b1860c8be61388d0b77814c53260f96e17a"}, {"url": "https://git.kernel.org/stable/c/b00a9aaa4be20ad6e3311fb78a485eae0899e89a"}, {"url": "https://git.kernel.org/stable/c/4c90f90a91d75c3c73dd633827c90e8746d9f54d"}, {"url": "https://git.kernel.org/stable/c/1a1dbc4473974867fe8c5f195c17b341c8e82867"}, {"url": "https://git.kernel.org/stable/c/3d213a4ddf49a860be6e795482c17f87e0c82b2a"}, {"url": "https://git.kernel.org/stable/c/f18139966d072dab8e4398c95ce955a9742e04f7"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: aardvark: Fix kernel panic during PIO transfer\n\nTrying to start a new PIO transfer by writing value 0 in PIO_START register\nwhen previous transfer has not yet completed (which is indicated by value 1\nin PIO_START) causes an External Abort on CPU, which results in kernel\npanic:\n\n SError Interrupt on CPU0, code 0xbf000002 -- SError\n Kernel panic - not syncing: Asynchronous SError Interrupt\n\nTo prevent kernel panic, it is required to reject a new PIO transfer when\nprevious one has not finished yet.\n\nIf previous PIO transfer is not finished yet, the kernel may issue a new\nPIO request only if the previous PIO transfer timed out.\n\nIn the past the root cause of this issue was incorrectly identified (as it\noften happens during link retraining or after link down event) and special\nhack was implemented in Trusted Firmware to catch all SError events in EL3,\nto ignore errors with code 0xbf000002 and not forwarding any other errors\nto kernel and instead throw panic from EL3 Trusted Firmware handler.\n\nLinks to discussion and patches about this issue:\nhttps://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/commit/?id=3c7dcdac5c50\nhttps://lore.kernel.org/linux-pci/20190316161243.29517-1-repk@triplefau.lt/\nhttps://lore.kernel.org/linux-pci/971be151d24312cc533989a64bd454b4@www.loen.fr/\nhttps://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/1541\n\nBut the real cause was the fact that during link retraining or after link\ndown event the PIO transfer may take longer time, up to the 1.44s until it\ntimes out. This increased probability that a new PIO transfer would be\nissued by kernel while previous one has not finished yet.\n\nAfter applying this change into the kernel, it is possible to revert the\nmentioned TF-A hack and SError events do not have to be caught in TF-A EL3."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.14.240", "versionStartIncluding": "4.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.19.198", "versionStartIncluding": "4.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.128", "versionStartIncluding": "4.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.46", "versionStartIncluding": "4.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.12.13", "versionStartIncluding": "4.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.13", "versionStartIncluding": "4.8"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-12-18T11:36:18.938Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47229", "state": "PUBLISHED", "dateUpdated": "2025-12-18T11:36:18.938Z", "dateReserved": "2024-04-10T18:59:19.530Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-21T14:19:32.995Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/pci/controller/pci-aardvark.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "400e6b1860c8be61388d0b77814c53260f96e17a", "status": "affected", "version": "8c39d710363c14ecb09219332869707395d1d495", "versionType": "git"}, {"lessThan": "b00a9aaa4be20ad6e3311fb78a485eae0899e89a", "status": "affected", "version": "8c39d710363c14ecb09219332869707395d1d495", "versionType": "git"}, {"lessThan": "4c90f90a91d75c3c73dd633827c90e8746d9f54d", "status": "affected", "version": "8c39d710363c14ecb09219332869707395d1d495", "versionType": "git"}, {"lessThan": "1a1dbc4473974867fe8c5f195c17b341c8e82867", "status": "affected", "version": "8c39d710363c14ecb09219332869707395d1d495", "versionType": "git"}, {"lessThan": "3d213a4ddf49a860be6e795482c17f87e0c82b2a", "status": "affected", "version": "8c39d710363c14ecb09219332869707395d1d495", "versionType": "git"}, {"lessThan": "f18139966d072dab8e4398c95ce955a9742e04f7", "status": "affected", "version": "8c39d710363c14ecb09219332869707395d1d495", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/pci/controller/pci-aardvark.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.8"}, {"lessThan": "4.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "4.14.*", "status": "unaffected", "version": "4.14.240", "versionType": "semver"}, {"lessThanOrEqual": "4.19.*", "status": "unaffected", "version": "4.19.198", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.128", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.46", "versionType": "semver"}, {"lessThanOrEqual": "5.12.*", "status": "unaffected", "version": "5.12.13", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.13", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A5B4B002-143F-442C-86E6-8A8B83FEA66E", "versionEndExcluding": "4.14.240", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B93AEDB9-C52B-4222-8F9A-882DAD9EF5B2", "versionEndExcluding": "4.19.198", "versionStartIncluding": "4.15", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "6267BD4E-BE25-48B5-B850-4B493440DAFA", "versionEndExcluding": "5.4.128", "versionStartIncluding": "4.20", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "59455D13-A902-42E1-97F7-5ED579777193", "versionEndExcluding": "5.10.46", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7806E7E5-6D4F-4E18-81C1-79B3C60EE855", "versionEndExcluding": "5.12.13", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*", "matchCriteriaId": "0CBAD0FC-C281-4666-AB2F-F8E6E1165DF7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*", "matchCriteriaId": "96AC23B2-D46A-49D9-8203-8E1BEDCA8532", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*", "matchCriteriaId": "DA610E30-717C-4700-9F77-A3C9244F3BFD", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*", "matchCriteriaId": "1ECD33F5-85BE-430B-8F86-8D7BD560311D", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*", "matchCriteriaId": "CF351855-2437-4CF5-AD7C-BDFA51F27683", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:*", "matchCriteriaId": "25A855BA-2118-44F2-90EF-EBBB12AF51EF", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: aardvark: Fix kernel panic during PIO transfer\n\nTrying to start a new PIO transfer by writing value 0 in PIO_START register\nwhen previous transfer has not yet completed (which is indicated by value 1\nin PIO_START) causes an External Abort on CPU, which results in kernel\npanic:\n\n SError Interrupt on CPU0, code 0xbf000002 -- SError\n Kernel panic - not syncing: Asynchronous SError Interrupt\n\nTo prevent kernel panic, it is required to reject a new PIO transfer when\nprevious one has not finished yet.\n\nIf previous PIO transfer is not finished yet, the kernel may issue a new\nPIO request only if the previous PIO transfer timed out.\n\nIn the past the root cause of this issue was incorrectly identified (as it\noften happens during link retraining or after link down event) and special\nhack was implemented in Trusted Firmware to catch all SError events in EL3,\nto ignore errors with code 0xbf000002 and not forwarding any other errors\nto kernel and instead throw panic from EL3 Trusted Firmware handler.\n\nLinks to discussion and patches about this issue:\nhttps://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/commit/?id=3c7dcdac5c50\nhttps://lore.kernel.org/linux-pci/20190316161243.29517-1-repk@triplefau.lt/\nhttps://lore.kernel.org/linux-pci/971be151d24312cc533989a64bd454b4@www.loen.fr/\nhttps://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/1541\n\nBut the real cause was the fact that during link retraining or after link\ndown event the PIO transfer may take longer time, up to the 1.44s until it\ntimes out. This increased probability that a new PIO transfer would be\nissued by kernel while previous one has not finished yet.\n\nAfter applying this change into the kernel, it is possible to revert the\nmentioned TF-A hack and SError events do not have to be caught in TF-A EL3."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: PCI: aardvark: solucion\u00f3 el p\u00e1nico del kernel durante la transferencia de PIO. Intentar iniciar una nueva transferencia de PIO escribiendo el valor 0 en el registro PIO_START cuando la transferencia anterior a\u00fan no se ha completado (que se indica con el valor 1). en PIO_START) provoca un aborto externo en la CPU, lo que resulta en p\u00e1nico del kernel: Interrupci\u00f3n de SError en CPU0, c\u00f3digo 0xbf000002 - P\u00e1nico del kernel de SError - no se sincroniza: Interrupci\u00f3n de SError asincr\u00f3nica Para evitar el p\u00e1nico del kernel, es necesario rechazar una nueva transferencia de PIO cuando el anterior a\u00fan no ha terminado. Si la transferencia PIO anterior a\u00fan no ha finalizado, el kernel puede emitir una nueva solicitud PIO solo si se agot\u00f3 el tiempo de espera de la transferencia PIO anterior. En el pasado, la causa root de este problema se identific\u00f3 incorrectamente (como sucede a menudo durante el reentrenamiento del enlace o despu\u00e9s de un evento de ca\u00edda del enlace) y se implement\u00f3 un truco especial en Trusted Firmware para detectar todos los eventos de SError en EL3, para ignorar los errores con el c\u00f3digo 0xbf000002 y no reenviar cualquier otro error al kernel y en su lugar generar p\u00e1nico desde el controlador de firmware confiable EL3. Enlaces a discusiones y parches sobre este problema: https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/commit/?id=3c7dcdac5c50 https://lore.kernel.org/linux-pci /20190316161243.29517-1-repk@triplefau.lt/ https://lore.kernel.org/linux-pci/971be151d24312cc533989a64bd454b4@www.loen.fr/ https://review.trustedfirmware.org/c/TF-A/trusted -firmware-a/+/1541 Pero la causa real fue el hecho de que durante el reentrenamiento del enlace o despu\u00e9s de un evento de ca\u00edda del enlace, la transferencia de PIO puede tardar m\u00e1s tiempo, hasta 1,44 segundos hasta que se agote el tiempo de espera. Esto aumenta la probabilidad de que el kernel emita una nueva transferencia PIO mientras que la anterior a\u00fan no ha finalizado. Despu\u00e9s de aplicar este cambio en el kernel, es posible revertir el hack de TF-A mencionado y los eventos SError no tienen que detectarse en TF-A EL3."}], "id": "CVE-2021-47229", "lastModified": "2026-06-17T04:16:57.467", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47229", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T15:40:07.082341Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:12.323", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1a1dbc4473974867fe8c5f195c17b341c8e82867"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3d213a4ddf49a860be6e795482c17f87e0c82b2a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/400e6b1860c8be61388d0b77814c53260f96e17a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c90f90a91d75c3c73dd633827c90e8746d9f54d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b00a9aaa4be20ad6e3311fb78a485eae0899e89a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f18139966d072dab8e4398c95ce955a9742e04f7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1a1dbc4473974867fe8c5f195c17b341c8e82867"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3d213a4ddf49a860be6e795482c17f87e0c82b2a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/400e6b1860c8be61388d0b77814c53260f96e17a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c90f90a91d75c3c73dd633827c90e8746d9f54d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b00a9aaa4be20ad6e3311fb78a485eae0899e89a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f18139966d072dab8e4398c95ce955a9742e04f7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: PCI: aardvark: Fix kernel panic during PIO transfer", "id": "2282588", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282588"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nPCI: aardvark: Fix kernel panic during PIO transfer\nTrying to start a new PIO transfer by writing value 0 in PIO_START register\nwhen previous transfer has not yet completed (which is indicated by value 1\nin PIO_START) causes an External Abort on CPU, which results in kernel\npanic:\nSError Interrupt on CPU0, code 0xbf000002 -- SError\nKernel panic - not syncing: Asynchronous SError Interrupt\nTo prevent kernel panic, it is required to reject a new PIO transfer when\nprevious one has not finished yet.\nIf previous PIO transfer is not finished yet, the kernel may issue a new\nPIO request only if the previous PIO transfer timed out.\nIn the past the root cause of this issue was incorrectly identified (as it\noften happens during link retraining or after link down event) and special\nhack was implemented in Trusted Firmware to catch all SError events in EL3,\nto ignore errors with code 0xbf000002 and not forwarding any other errors\nto kernel and instead throw panic from EL3 Trusted Firmware handler.\nLinks to discussion and patches about this issue:\nhttps://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/commit/?id=3c7dcdac5c50\nhttps://lore.kernel.org/linux-pci/20190316161243.29517-1-repk@triplefau.lt/\nhttps://lore.kernel.org/linux-pci/971be151d24312cc533989a64bd454b4@www.loen.fr/\nhttps://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/1541\nBut the real cause was the fact that during link retraining or after link\ndown event the PIO transfer may take longer time, up to the 1.44s until it\ntimes out. This increased probability that a new PIO transfer would be\nissued by kernel while previous one has not finished yet.\nAfter applying this change into the kernel, it is possible to revert the\nmentioned TF-A hack and SError events do not have to be caught in TF-A EL3."], "name": "CVE-2021-47229", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47229\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47229\nhttps://lore.kernel.org/linux-cve-announce/2024052138-CVE-2021-47229-408e@gregkh/T"], "threat_severity": "Low"}

{}