138 lines
8.4 KiB
JSON
138 lines
8.4 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-80633",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-26T14:34:25.776Z",
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"datePublished": "2026-08-28T06:48:48.372Z",
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"dateUpdated": "2026-08-29T06:21:32.731Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-29T06:21:32.731Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
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"baseScore": 8.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The bug is reached only via local syscalls on /dev/iommu or VFIO-compat iommufd: open, IOMMU_IOAS_MAP_FILE with a dma-buf fd, then IOMMU_IOAS_UNMAP/close triggers iopt_release_pages()->dma_buf_unpin(); no network or packet handler is involved.\nAC:L - Every teardown of the last dma-buf-backed iopt_pages deterministically hits dma_buf_unpin() without dma_resv; an attacker also controls concurrent invalidate/revoke via IOMMU_IOAS_UNMAP and dma_buf_invalidate_mappings (selftest revoke or VFIO PCI dmabuf revoke).\nPR:L - No init-namespace root or special capability is required for the IOAS map/unmap path once a process can open iommufd (0660) and hold a compatible dma-buf fd, as in cloud GPU/VFIO passthrough tenants or iommufd selftests.\nUI:N - Exploitation requires no victim interaction; the attacker programmatically creates the IOAS dma-buf mapping and drives unmap/close and optional concurrent revoke through their own file descriptors and ioctl calls.\nS:C - Missing dma_resv locking during dma-buf unpin/detach races dma_buf_invalidate_mappings and can leave stale IOMMU IOVA-to-physical mappings or permit buffer movement while DMA views remain, breaking the IOMMU/DMA isolation boundary.\nC:H - Concurrent dma_resv-protected invalidation during unpin without the reservation lock can race teardown of iopt_pages/dmabuf attachments and yield kernel heap use-after-free or stale mapping visibility exploitable for arbitrary kernel memory read.\nI:H - Racing unpin without dma_resv against invalidate/revoke can leave IOMMU page tables pointing at repinned/moved exporter pages, giving a device DMA write primitive to attacker-influenced physical memory and enabling control-flow corruption.\nA:H - The missing lock triggers dma_resv_assert_held WARN on every dma-buf IOAS unmap/destroy (reproduced in iommufd selftests), and concurrent teardown races can provoke kernel oops/panic or wedge GPU/VFIO+iommufd workloads."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/iommu/iommufd/pages.c"
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],
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"versions": [
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{
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"version": "8c5f9645c3893f0db679d9affe4fe4e665b990dd",
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"lessThan": "cc69d0332421fd2943b66dbe5e597bf4fd5af126",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "8c5f9645c3893f0db679d9affe4fe4e665b990dd",
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"lessThan": "e745cd2c749e557c14a15ac931761c3f58c24489",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/iommu/iommufd/pages.c"
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],
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"versions": [
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{
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"version": "7.1",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "7.1",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.1",
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"versionEndExcluding": "7.1.5"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.1",
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"versionEndExcluding": "7.2"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/cc69d0332421fd2943b66dbe5e597bf4fd5af126"
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},
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{
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"url": "https://git.kernel.org/stable/c/e745cd2c749e557c14a15ac931761c3f58c24489"
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}
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],
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"title": "iommufd: Take dma_resv lock before dma_buf_unpin() in release path",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |