{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90388", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.810Z", "datePublished": "2026-09-17T16:09:23.140Z", "dateUpdated": "2026-10-19T09:02:51.717Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:02:51.717Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/dma: Check atomic pool allocation result directly\n\nThe non-blocking, non-coherent allocation path uses dma_alloc_from_pool(),\nwhich returns the allocated page and fills cpu_addr only on success.\n\nDo not rely on cpu_addr to detect allocation failure in this path. Check\nthe returned page directly before using it for the IOMMU mapping." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - iommu_dma_alloc() is reached from dma_alloc_attrs() on GFP_ATOMIC dma_alloc_coherent(); local entry points are VIDIOC_STREAMON scheduling mxc_jpeg_device_run()→mxc_jpeg_alloc(), and USBDEVFS_SUBMITURB in proc_do_submiturb()→usb_submit_urb(GFP_ATOMIC)→dma_pool_alloc()→pool_alloc_page(). No remote protocol message supplies the failed allocation.\nAC:L - The attacker drives dma_alloc_from_pool() failure by consuming the atomic gen_pool (repeated GFP_ATOMIC coherent allocs or a size larger than gen_pool_avail) then issues that ioctl; __dma_alloc_from_pool() does not store cpu_addr on failure, so a non-NULL leftover skips the old !cpu_addr check with no victim-side race.\nPR:L - mxc_jpeg_open() and proc_do_submiturb() have no capable() check; an unprivileged local user who can open the JPEG /dev/videoN or a usbfs device node reaches iommu_dma_alloc() without init-namespace root.\nUI:N - The attacker itself issues VIDIOC_QBUF/VIDIOC_STREAMON on its video fd or USBDEVFS_SUBMITURB on its usbfs fd; no separate user must mount, confirm, or plug a device.\nS:U - The leftover cpu_addr is used as a host kernel VA and page_to_phys(NULL) is mapped only in this device's iommu_dma domain via __iommu_dma_map(); that is in-kernel corruption, not a KVM/Xen escape or an extra translation into another VM's memory.\nC:H - iommu_dma_alloc() returns the uninitialized cpu_addr as the coherent buffer; later loads of that object (mxc_jpeg_config_dec_desc()/print_descriptor_info on slot_data.desc, or USB TD completion from a dma_pool block carved out of the wild page) disclose kernel memory through the leftover pointer.\nI:H - Callers store through that pointer: mxc_jpeg_config_dec_desc() writes desc->imgsize/stm_ctrl into jpeg->slot_data.desc, and pool_initialise_page() writes dma_block.next_block into page->vaddr from the failed dma_alloc_from_pool(), a kernel write primitive.\nA:H - page_to_phys(NULL) followed by iommu_map() in __iommu_dma_map(), or a store/load through an unmapped leftover cpu_addr in mxc_jpeg_config_dec_desc() or pool_initialise_page(), oopses or panics the kernel." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/iommu/dma-iommu.c" ], "versions": [ { "version": "9420139f516d7fbc248ce17f35275cb005ed98ea", "lessThan": "ac9cd0a669b8be5d178dbd471b0d68039dac58b5", "status": "affected", "versionType": "git" }, { "version": "9420139f516d7fbc248ce17f35275cb005ed98ea", "lessThan": "db46cb9da83a507d86d2bb080bdb09c865da3d0a", "status": "affected", "versionType": "git" }, { "version": "9420139f516d7fbc248ce17f35275cb005ed98ea", "lessThan": "d56c3f955b21e5764c1497e295a5b5d0b3a40470", "status": "affected", "versionType": "git" }, { "version": "9420139f516d7fbc248ce17f35275cb005ed98ea", "lessThan": "06dffc96693083dda3412311406e558cf27f1574", "status": "affected", "versionType": "git" }, { "version": "9420139f516d7fbc248ce17f35275cb005ed98ea", "lessThan": "a4ace31d732b657d774e31fb444c0c27d42c78e5", "status": "affected", "versionType": "git" }, { "version": "9420139f516d7fbc248ce17f35275cb005ed98ea", "lessThan": "fb0b39287ba894dbdfac2901c51788b63f5c2291", "status": "affected", "versionType": "git" }, { "version": "9420139f516d7fbc248ce17f35275cb005ed98ea", "lessThan": "8c486293ddd0af60991408149fc3e964ea888dc4", "status": "affected", "versionType": "git" }, { "version": "9420139f516d7fbc248ce17f35275cb005ed98ea", "lessThan": "af95a0ebc0a0db0762be75f51eadf770bad01aaa", "status": "affected", "versionType": "git" }, { "version": "47184b9ddf184cc9a77cf441943a0fe9b7afa575", "status": "affected", "versionType": "git" }, { "version": "5.8.6", "lessThan": "5.9", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/iommu/dma-iommu.c" ], "versions": [ { "version": "5.9", "status": "affected" }, { "version": "0", "lessThan": "5.9", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "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": "5.9", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "7.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8.6" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ac9cd0a669b8be5d178dbd471b0d68039dac58b5" }, { "url": "https://git.kernel.org/stable/c/db46cb9da83a507d86d2bb080bdb09c865da3d0a" }, { "url": "https://git.kernel.org/stable/c/d56c3f955b21e5764c1497e295a5b5d0b3a40470" }, { "url": "https://git.kernel.org/stable/c/06dffc96693083dda3412311406e558cf27f1574" }, { "url": "https://git.kernel.org/stable/c/a4ace31d732b657d774e31fb444c0c27d42c78e5" }, { "url": "https://git.kernel.org/stable/c/fb0b39287ba894dbdfac2901c51788b63f5c2291" }, { "url": "https://git.kernel.org/stable/c/8c486293ddd0af60991408149fc3e964ea888dc4" }, { "url": "https://git.kernel.org/stable/c/af95a0ebc0a0db0762be75f51eadf770bad01aaa" } ], "title": "iommu/dma: Check atomic pool allocation result directly", "x_generator": { "engine": "bippy-1.2.0" } } } }