{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-80633",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-26T14:34:25.776Z",
        "datePublished": "2026-08-28T06:48:48.372Z",
        "dateUpdated": "2026-08-28T06:48:48.372Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-28T06:48:48.372Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Take dma_resv lock before dma_buf_unpin() in release path\n\ndma_buf_unpin() requires the caller to hold the exporter's dma_resv\nlock:\n\n  void dma_buf_unpin(struct dma_buf_attachment *attach)\n  {\n          ...\n          dma_resv_assert_held(dmabuf->resv);\n          ...\n  }\n\niopt_release_pages() calls dma_buf_unpin() without taking that lock,\nso every iommufd_ioas_destroy()/iommufd_ioas_unmap() that releases\nthe last reference on a DMABUF-backed iopt_pages triggers a WARN.\nThis was hit while running tools/testing/selftests/iommu/iommufd:\n\n  WARNING: drivers/dma-buf/dma-buf.c:1137 at dma_buf_unpin+0x62/0x70\n  RIP: 0010:dma_buf_unpin+0x62/0x70\n  Call Trace:\n   <TASK>\n   dma_buf_unpin+0x62/0x70\n   iopt_release_pages+0xe4/0x190\n   iopt_unmap_iova_range+0x1c7/0x290\n   iopt_unmap_all+0x1a/0x30\n   iommufd_ioas_destroy+0x1d/0x50\n   iommufd_fops_release+0x93/0x150\n   __fput+0xfc/0x2c0\n   __x64_sys_close+0x3d/0x80\n   do_syscall_64+0x65/0x180\n   </TASK>\n\nTake the dma_resv lock around dma_buf_unpin() in iopt_release_pages(),\nmatching the iopt_map_dmabuf() convention. dma_buf_detach() acquires the\nreservation lock internally, so it must remain outside the locked region."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/iommu/iommufd/pages.c"
                    ],
                    "versions": [
                        {
                            "version": "8c5f9645c3893f0db679d9affe4fe4e665b990dd",
                            "lessThan": "cc69d0332421fd2943b66dbe5e597bf4fd5af126",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8c5f9645c3893f0db679d9affe4fe4e665b990dd",
                            "lessThan": "e745cd2c749e557c14a15ac931761c3f58c24489",
                            "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/iommu/iommufd/pages.c"
                    ],
                    "versions": [
                        {
                            "version": "7.1",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "7.1",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.5",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "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": "7.1",
                                    "versionEndExcluding": "7.1.5"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "7.1",
                                    "versionEndExcluding": "7.2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/cc69d0332421fd2943b66dbe5e597bf4fd5af126"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e745cd2c749e557c14a15ac931761c3f58c24489"
                }
            ],
            "title": "iommufd: Take dma_resv lock before dma_buf_unpin() in release path",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}