{"api_version":"1","generated_at":"2026-08-28T23:59:20+00:00","cve":"CVE-2026-80633","urls":{"html":"https://cve.report/CVE-2026-80633","api":"https://cve.report/api/cve/CVE-2026-80633.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80633","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80633"},"summary":{"title":"iommufd: Take dma_resv lock before dma_buf_unpin() in release path","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-28 08:16:48","updated_at":"2026-08-28 08:16:48"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/cc69d0332421fd2943b66dbe5e597bf4fd5af126","name":"https://git.kernel.org/stable/c/cc69d0332421fd2943b66dbe5e597bf4fd5af126","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e745cd2c749e557c14a15ac931761c3f58c24489","name":"https://git.kernel.org/stable/c/e745cd2c749e557c14a15ac931761c3f58c24489","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80633","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80633","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8c5f9645c3893f0db679d9affe4fe4e665b990dd cc69d0332421fd2943b66dbe5e597bf4fd5af126 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8c5f9645c3893f0db679d9affe4fe4e665b990dd e745cd2c749e557c14a15ac931761c3f58c24489 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.1","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"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"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"7.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"7.1","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-08-28T06:48:48.372Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80633","datePublished":"2026-08-28T06:48:48.372Z","dateReserved":"2026-08-26T14:34:25.776Z","dateUpdated":"2026-08-28T06:48:48.372Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-28 08:16:48","lastModifiedDate":"2026-08-28 08:16:48","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80633","Ordinal":"1","Title":"iommufd: Take dma_resv lock before dma_buf_unpin() in release pa","CVE":"CVE-2026-80633","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80633","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"iommufd: Take dma_resv lock before dma_buf_unpin() in release pa"}]}}}