{"api_version":"1","generated_at":"2026-08-07T00:15:43+00:00","cve":"CVE-2026-64328","urls":{"html":"https://cve.report/CVE-2026-64328","api":"https://cve.report/api/cve/CVE-2026-64328.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64328","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64328"},"summary":{"title":"usb: gadget: f_fs: Fix DMA fence leak","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Fix DMA fence leak\n\nIn ffs_dmabuf_transfer(), a ffs_dma_fence object is kmalloc'd, with the\nunderlying dma_fence later initialized by dma_fence_init(), which sets\nits kref counter to 1. Then, dma_resv_add_fence() gets a second\nreference, and a pointer to the ffs_dma_fence is passed as the\nusb_request's \"context\" field.\n\nThe dma-resv mechanism will manage the second reference, but the first\nreference is never properly released; the ffs_dmabuf_cleanup() function\ndecreases the reference count, but only to balance with the reference\ngrab in ffs_dmabuf_signal_done().\n\nThe code will then slowly leak memory as more ffs_dma_fence objects are\ncreated without being ever freed.\n\nAddress this issue by transferring ownership of the fence to the DMA\nreservation object, by calling dma_fence_put() right after\ndma_resv_add_fence(). The ffs_dma_fence then gets properly discarded\nafter being signalled.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:14","updated_at":"2026-07-25 10:17:14"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/e086c16962a1b0142e2675610e9c06fcfcd4c3a8","name":"https://git.kernel.org/stable/c/e086c16962a1b0142e2675610e9c06fcfcd4c3a8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b7475b2dce5e121e687280ba5732ccefe77ffd2f","name":"https://git.kernel.org/stable/c/b7475b2dce5e121e687280ba5732ccefe77ffd2f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0cae3d6109427c455bad0a18dfb3e2a91657e38a","name":"https://git.kernel.org/stable/c/0cae3d6109427c455bad0a18dfb3e2a91657e38a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/baa6b6068a3f2bf2ed525a1cb37975905dadc658","name":"https://git.kernel.org/stable/c/baa6b6068a3f2bf2ed525a1cb37975905dadc658","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64328","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64328","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7b07a2a7ca02a20124b552be96c5a56910795488 b7475b2dce5e121e687280ba5732ccefe77ffd2f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7b07a2a7ca02a20124b552be96c5a56910795488 e086c16962a1b0142e2675610e9c06fcfcd4c3a8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7b07a2a7ca02a20124b552be96c5a56910795488 0cae3d6109427c455bad0a18dfb3e2a91657e38a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7b07a2a7ca02a20124b552be96c5a56910795488 baa6b6068a3f2bf2ed525a1cb37975905dadc658 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.9","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.9 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.96 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.39 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.4 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64328","cve":"CVE-2026-64328","epss":"0.002000000","percentile":"0.101470000","score_date":"2026-07-28","updated_at":"2026-07-29 00:05:33"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/usb/gadget/function/f_fs.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b7475b2dce5e121e687280ba5732ccefe77ffd2f","status":"affected","version":"7b07a2a7ca02a20124b552be96c5a56910795488","versionType":"git"},{"lessThan":"e086c16962a1b0142e2675610e9c06fcfcd4c3a8","status":"affected","version":"7b07a2a7ca02a20124b552be96c5a56910795488","versionType":"git"},{"lessThan":"0cae3d6109427c455bad0a18dfb3e2a91657e38a","status":"affected","version":"7b07a2a7ca02a20124b552be96c5a56910795488","versionType":"git"},{"lessThan":"baa6b6068a3f2bf2ed525a1cb37975905dadc658","status":"affected","version":"7b07a2a7ca02a20124b552be96c5a56910795488","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/usb/gadget/function/f_fs.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.9"},{"lessThan":"6.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.96","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.39","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.96","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.39","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.4","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc3","versionStartIncluding":"6.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Fix DMA fence leak\n\nIn ffs_dmabuf_transfer(), a ffs_dma_fence object is kmalloc'd, with the\nunderlying dma_fence later initialized by dma_fence_init(), which sets\nits kref counter to 1. Then, dma_resv_add_fence() gets a second\nreference, and a pointer to the ffs_dma_fence is passed as the\nusb_request's \"context\" field.\n\nThe dma-resv mechanism will manage the second reference, but the first\nreference is never properly released; the ffs_dmabuf_cleanup() function\ndecreases the reference count, but only to balance with the reference\ngrab in ffs_dmabuf_signal_done().\n\nThe code will then slowly leak memory as more ffs_dma_fence objects are\ncreated without being ever freed.\n\nAddress this issue by transferring ownership of the fence to the DMA\nreservation object, by calling dma_fence_put() right after\ndma_resv_add_fence(). The ffs_dma_fence then gets properly discarded\nafter being signalled."}],"providerMetadata":{"dateUpdated":"2026-07-25T08:49:56.340Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/b7475b2dce5e121e687280ba5732ccefe77ffd2f"},{"url":"https://git.kernel.org/stable/c/e086c16962a1b0142e2675610e9c06fcfcd4c3a8"},{"url":"https://git.kernel.org/stable/c/0cae3d6109427c455bad0a18dfb3e2a91657e38a"},{"url":"https://git.kernel.org/stable/c/baa6b6068a3f2bf2ed525a1cb37975905dadc658"}],"title":"usb: gadget: f_fs: Fix DMA fence leak","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64328","datePublished":"2026-07-25T08:49:56.340Z","dateReserved":"2026-07-19T15:36:31.780Z","dateUpdated":"2026-07-25T08:49:56.340Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:14","lastModifiedDate":"2026-07-25 10:17:14","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64328","Ordinal":"1","Title":"usb: gadget: f_fs: Fix DMA fence leak","CVE":"CVE-2026-64328","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64328","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Fix DMA fence leak\n\nIn ffs_dmabuf_transfer(), a ffs_dma_fence object is kmalloc'd, with the\nunderlying dma_fence later initialized by dma_fence_init(), which sets\nits kref counter to 1. Then, dma_resv_add_fence() gets a second\nreference, and a pointer to the ffs_dma_fence is passed as the\nusb_request's \"context\" field.\n\nThe dma-resv mechanism will manage the second reference, but the first\nreference is never properly released; the ffs_dmabuf_cleanup() function\ndecreases the reference count, but only to balance with the reference\ngrab in ffs_dmabuf_signal_done().\n\nThe code will then slowly leak memory as more ffs_dma_fence objects are\ncreated without being ever freed.\n\nAddress this issue by transferring ownership of the fence to the DMA\nreservation object, by calling dma_fence_put() right after\ndma_resv_add_fence(). The ffs_dma_fence then gets properly discarded\nafter being signalled.","Type":"Description","Title":"usb: gadget: f_fs: Fix DMA fence leak"}]}}}