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vuln-cve/data/2026/90xxx/CVE-2026-90388.json
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{
"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"
},
{
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"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"
}
}
}
}
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