248 lines
13 KiB
JSON
248 lines
13 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-2026-64590",
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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": "2026-07-19T15:36:31.798Z",
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"datePublished": "2026-08-06T07:13:47.888Z",
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"dateUpdated": "2026-08-23T12:45:45.786Z"
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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": "2026-08-23T12:45:45.786Z"
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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\ndma-buf/udmabuf: skip redundant cpu sync to fix cacheline EEXIST warning\n\nWhen CONFIG_DMA_API_DEBUG_SG is enabled, importing a udmabuf into a DRM\ndriver (e.g. amdgpu for video playback in GNOME Videos / Showtime)\ntriggers a spurious warning:\n\n DMA-API: amdgpu 0000:03:00.0: cacheline tracking EEXIST, \\\n overlapping mappings aren't supported\n WARNING: kernel/dma/debug.c:619 at add_dma_entry+0x473/0x5f0\n\nThe call chain is:\n\n amdgpu_cs_ioctl\n -> amdgpu_ttm_backend_bind\n -> dma_buf_map_attachment\n -> [udmabuf] map_udmabuf -> get_sg_table\n -> dma_map_sgtable(dev, sg, direction, 0) // attrs=0\n -> debug_dma_map_sg -> add_dma_entry -> EEXIST\n\nThis happens because udmabuf builds a per-page scatter-gather list via\nsg_set_folio(). When begin_cpu_udmabuf() has already created an sg\ntable mapped for the misc device, and an importer such as amdgpu maps\nthe same pages for its own device via map_udmabuf(), the DMA debug\ninfrastructure sees two active mappings whose physical addresses share\ncacheline boundaries and warns about the overlap.\n\nThe DMA_ATTR_SKIP_CPU_SYNC flag suppresses this check in\nadd_dma_entry() because it signals that no CPU cache maintenance is\nperformed at map/unmap time, making the cacheline overlap harmless.\n\nAll other major dma-buf exporters already pass this flag:\n - drm_gem_map_dma_buf() passes DMA_ATTR_SKIP_CPU_SYNC\n - amdgpu_dma_buf_map() passes DMA_ATTR_SKIP_CPU_SYNC\n\nThe CPU sync at map/unmap time is also redundant for udmabuf:\nbegin_cpu_udmabuf() and end_cpu_udmabuf() already perform explicit\ncache synchronization via dma_sync_sgtable_for_cpu/device() when CPU\naccess is requested through the dma-buf interface.\n\nPass DMA_ATTR_SKIP_CPU_SYNC to dma_map_sgtable() and\ndma_unmap_sgtable() in udmabuf to suppress the spurious warning and\nskip the redundant sync."
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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/dma-buf/udmabuf.c"
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],
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"versions": [
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{
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"version": "284562e1f34874e267d4f499362c3816f8f6bc3f",
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"lessThan": "4a7c644e632741c2a3116a0d3da6c11de957a6ba",
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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": "284562e1f34874e267d4f499362c3816f8f6bc3f",
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"lessThan": "01126abc11bcc6a45b664293b0b5df715be911d7",
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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": "284562e1f34874e267d4f499362c3816f8f6bc3f",
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"lessThan": "dd7f1e572f44d3d039dc77e3989f537196c3bf52",
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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": "284562e1f34874e267d4f499362c3816f8f6bc3f",
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"lessThan": "0db56e7eae932f8e2f3eb44ad1a63633d8f504f8",
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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": "284562e1f34874e267d4f499362c3816f8f6bc3f",
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"lessThan": "d6552f5cff795d60e629f37513ecf23d88fd2f82",
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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": "284562e1f34874e267d4f499362c3816f8f6bc3f",
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"lessThan": "34696563461c9a23177feb6d8aff43f4c0510278",
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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": "284562e1f34874e267d4f499362c3816f8f6bc3f",
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"lessThan": "0449a6583c0ee76778d314e4e82f166fc97fa9d8",
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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": "284562e1f34874e267d4f499362c3816f8f6bc3f",
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"lessThan": "504e2b4ab97a51d56d966cd36d0997ad30b65b2d",
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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/dma-buf/udmabuf.c"
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],
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"versions": [
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{
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"version": "5.6",
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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": "5.6",
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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": "5.10.266",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.217",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.184",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.148",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.96",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.39",
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"lessThanOrEqual": "6.18.*",
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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": "7.1.4",
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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": "5.6",
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"versionEndExcluding": "5.10.266"
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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": "5.6",
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"versionEndExcluding": "5.15.217"
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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": "5.6",
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"versionEndExcluding": "6.1.184"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.6",
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"versionEndExcluding": "6.6.148"
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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": "5.6",
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"versionEndExcluding": "6.12.96"
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{
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"versionStartIncluding": "5.6",
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"versionEndExcluding": "7.1.4"
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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/4a7c644e632741c2a3116a0d3da6c11de957a6ba"
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},
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{
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"url": "https://git.kernel.org/stable/c/01126abc11bcc6a45b664293b0b5df715be911d7"
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},
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{
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"url": "https://git.kernel.org/stable/c/dd7f1e572f44d3d039dc77e3989f537196c3bf52"
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},
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{
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"url": "https://git.kernel.org/stable/c/0db56e7eae932f8e2f3eb44ad1a63633d8f504f8"
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},
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{
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"url": "https://git.kernel.org/stable/c/d6552f5cff795d60e629f37513ecf23d88fd2f82"
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},
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{
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"url": "https://git.kernel.org/stable/c/34696563461c9a23177feb6d8aff43f4c0510278"
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},
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{
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"url": "https://git.kernel.org/stable/c/0449a6583c0ee76778d314e4e82f166fc97fa9d8"
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},
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{
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"url": "https://git.kernel.org/stable/c/504e2b4ab97a51d56d966cd36d0997ad30b65b2d"
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}
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],
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"title": "dma-buf/udmabuf: skip redundant cpu sync to fix cacheline EEXIST warning",
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"x_generator": {
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