{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-05-10T08:17:02.165","vulnerabilities":[{"cve":{"id":"CVE-2021-47140","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2024-03-25T09:15:08.740","lastModified":"2025-03-19T16:28:16.000","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: Clear DMA ops when switching domain\n\nSince commit 08a27c1c3ecf (\"iommu: Add support to change default domain\nof an iommu group\") a user can switch a device between IOMMU and direct\nDMA through sysfs. This doesn't work for AMD IOMMU at the moment because\ndev->dma_ops is not cleared when switching from a DMA to an identity\nIOMMU domain. The DMA layer thus attempts to use the dma-iommu ops on an\nidentity domain, causing an oops:\n\n  # echo 0000:00:05.0 > /sys/sys/bus/pci/drivers/e1000e/unbind\n  # echo identity > /sys/bus/pci/devices/0000:00:05.0/iommu_group/type\n  # echo 0000:00:05.0 > /sys/sys/bus/pci/drivers/e1000e/bind\n   ...\n  BUG: kernel NULL pointer dereference, address: 0000000000000028\n   ...\n   Call Trace:\n    iommu_dma_alloc\n    e1000e_setup_tx_resources\n    e1000e_open\n\nSince iommu_change_dev_def_domain() calls probe_finalize() again, clear\nthe dma_ops there like Vt-d does."},{"lang":"es","value":"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: iommu/amd: borra las operaciones de DMA al cambiar de dominio. Desde el commit 08a27c1c3ecf (\"iommu: agrega soporte para cambiar el dominio predeterminado de un grupo iommu\"), un usuario puede cambiar un dispositivo entre IOMMU y DMA directo a través de sysfs. Esto no funciona para AMD IOMMU en este momento porque dev->dma_ops no se borra al cambiar de un DMA a un dominio IOMMU de identidad. Por lo tanto, la capa DMA intenta utilizar las operaciones dma-iommu en un dominio de identidad, lo que provoca un error: # echo 0000:00:05.0 > /sys/sys/bus/pci/drivers/e1000e/unbind # echo Identity > /sys/ bus/pci/devices/0000:00:05.0/iommu_group/type # echo 0000:00:05.0 > /sys/sys/bus/pci/drivers/e1000e/bind ... ERROR: desreferencia del puntero NULL del kernel, dirección: 0000000000000028 ... Seguimiento de llamadas: iommu_dma_alloc e1000e_setup_tx_resources e1000e_open Dado que iommu_change_dev_def_domain() llama a probe_finalize() nuevamente, borre dma_ops allí como lo hace Vt-d."}],"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"LOW"},"exploitabilityScore":3.9,"impactScore":1.4}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-476"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.12.9","matchCriteriaId":"2C8A1D02-81A7-44E5-ACFD-CC6A6694F930"},{"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"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/d6177a6556f853785867e2ec6d5b7f4906f0d809","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/f3f2cf46291a693eab21adb94171b0128c2a9ec1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/d6177a6556f853785867e2ec6d5b7f4906f0d809","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/f3f2cf46291a693eab21adb94171b0128c2a9ec1","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"]}]}}]}