{"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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/iommu/iommufd/pages.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "cc69d0332421fd2943b66dbe5e597bf4fd5af126", "status": "affected", "version": "8c5f9645c3893f0db679d9affe4fe4e665b990dd", "versionType": "git"}, {"lessThan": "e745cd2c749e557c14a15ac931761c3f58c24489", "status": "affected", "version": "8c5f9645c3893f0db679d9affe4fe4e665b990dd", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/iommu/iommufd/pages.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.1"}, {"lessThan": "7.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-80633", "lastModified": "2026-08-28T08:16:48.200", "metrics": {}, "published": "2026-08-28T08:16:48.200", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cc69d0332421fd2943b66dbe5e597bf4fd5af126"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e745cd2c749e557c14a15ac931761c3f58c24489"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8c5f9645c3893f0db679d9affe4fe4e665b990dd,cc69d0332421fd2943b66dbe5e597bf4fd5af126)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8c5f9645c3893f0db679d9affe4fe4e665b990dd,e745cd2c749e557c14a15ac931761c3f58c24489)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-28T09:30:18.290673+00:00", "updated": "2026-08-28T11:00:11.224481+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-362"]}