{"api_version":"1","generated_at":"2026-07-25T20:10:37+00:00","cve":"CVE-2026-64426","urls":{"html":"https://cve.report/CVE-2026-64426","api":"https://cve.report/api/cve/CVE-2026-64426.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64426","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64426"},"summary":{"title":"io_uring/nop: fix file reference leak with IOSQE_FIXED_FILE","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/nop: fix file reference leak with IOSQE_FIXED_FILE\n\nNOP file-acquisition support choses between a fixed (registered) file and\na normal fget()'d file based on its own IORING_NOP_FIXED_FILE flag in\nsqe->nop_flags. However, a request's REQ_F_FIXED_FILE is set\nindependently from the generic IOSQE_FIXED_FILE sqe flag during request\ninit, before the issue handler runs.\n\nIf a NOP is submitted with IOSQE_FIXED_FILE set (so REQ_F_FIXED_FILE is\nset) but without IORING_NOP_FIXED_FILE, io_nop() takes the normal path\nand grabs a real reference via io_file_get_normal(). On completion,\nio_put_file() only drops the reference when REQ_F_FIXED_FILE is clear,\nso the fget()'d file is never released and leaks:\n\n  BUG: memory leak\n  unreferenced object 0xffff88800f42c240 (size 176):\n    kmem_cache_alloc_noprof+0x358/0x440\n    alloc_empty_file+0x57/0x180\n    path_openat+0x44/0x1e50\n    do_file_open+0x121/0x200\n    do_sys_openat2+0xa7/0x150\n    __x64_sys_openat+0x82/0xf0\n\nDecide between fixed and normal file acquisition from REQ_F_FIXED_FILE,\nthe same way io_assign_file() does for every other opcode, and fold\nIORING_NOP_FIXED_FILE into REQ_F_FIXED_FILE at prep time.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:26","updated_at":"2026-07-25 10:17:26"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/722869fcff598fad20d5ab79c305897a7534708b","name":"https://git.kernel.org/stable/c/722869fcff598fad20d5ab79c305897a7534708b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7267717f35787167fcce4bc14f6ef3fa06682dcf","name":"https://git.kernel.org/stable/c/7267717f35787167fcce4bc14f6ef3fa06682dcf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2564ca2e31bd8ee8348362941af2ee4671e487ca","name":"https://git.kernel.org/stable/c/2564ca2e31bd8ee8348362941af2ee4671e487ca","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64426","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64426","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a85f31052bce52111b4e9d5a536003481d0421d0 722869fcff598fad20d5ab79c305897a7534708b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a85f31052bce52111b4e9d5a536003481d0421d0 7267717f35787167fcce4bc14f6ef3fa06682dcf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a85f31052bce52111b4e9d5a536003481d0421d0 2564ca2e31bd8ee8348362941af2ee4671e487ca git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.13","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.13 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-rc1 * 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":["io_uring/nop.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"722869fcff598fad20d5ab79c305897a7534708b","status":"affected","version":"a85f31052bce52111b4e9d5a536003481d0421d0","versionType":"git"},{"lessThan":"7267717f35787167fcce4bc14f6ef3fa06682dcf","status":"affected","version":"a85f31052bce52111b4e9d5a536003481d0421d0","versionType":"git"},{"lessThan":"2564ca2e31bd8ee8348362941af2ee4671e487ca","status":"affected","version":"a85f31052bce52111b4e9d5a536003481d0421d0","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["io_uring/nop.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.13"},{"lessThan":"6.13","status":"unaffected","version":"0","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-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.39","versionStartIncluding":"6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.4","versionStartIncluding":"6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"6.13","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/nop: fix file reference leak with IOSQE_FIXED_FILE\n\nNOP file-acquisition support choses between a fixed (registered) file and\na normal fget()'d file based on its own IORING_NOP_FIXED_FILE flag in\nsqe->nop_flags. However, a request's REQ_F_FIXED_FILE is set\nindependently from the generic IOSQE_FIXED_FILE sqe flag during request\ninit, before the issue handler runs.\n\nIf a NOP is submitted with IOSQE_FIXED_FILE set (so REQ_F_FIXED_FILE is\nset) but without IORING_NOP_FIXED_FILE, io_nop() takes the normal path\nand grabs a real reference via io_file_get_normal(). On completion,\nio_put_file() only drops the reference when REQ_F_FIXED_FILE is clear,\nso the fget()'d file is never released and leaks:\n\n  BUG: memory leak\n  unreferenced object 0xffff88800f42c240 (size 176):\n    kmem_cache_alloc_noprof+0x358/0x440\n    alloc_empty_file+0x57/0x180\n    path_openat+0x44/0x1e50\n    do_file_open+0x121/0x200\n    do_sys_openat2+0xa7/0x150\n    __x64_sys_openat+0x82/0xf0\n\nDecide between fixed and normal file acquisition from REQ_F_FIXED_FILE,\nthe same way io_assign_file() does for every other opcode, and fold\nIORING_NOP_FIXED_FILE into REQ_F_FIXED_FILE at prep time."}],"providerMetadata":{"dateUpdated":"2026-07-25T08:51:03.867Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/722869fcff598fad20d5ab79c305897a7534708b"},{"url":"https://git.kernel.org/stable/c/7267717f35787167fcce4bc14f6ef3fa06682dcf"},{"url":"https://git.kernel.org/stable/c/2564ca2e31bd8ee8348362941af2ee4671e487ca"}],"title":"io_uring/nop: fix file reference leak with IOSQE_FIXED_FILE","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64426","datePublished":"2026-07-25T08:51:03.867Z","dateReserved":"2026-07-19T15:36:31.787Z","dateUpdated":"2026-07-25T08:51:03.867Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:26","lastModifiedDate":"2026-07-25 10:17:26","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64426","Ordinal":"1","Title":"io_uring/nop: fix file reference leak with IOSQE_FIXED_FILE","CVE":"CVE-2026-64426","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64426","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/nop: fix file reference leak with IOSQE_FIXED_FILE\n\nNOP file-acquisition support choses between a fixed (registered) file and\na normal fget()'d file based on its own IORING_NOP_FIXED_FILE flag in\nsqe->nop_flags. However, a request's REQ_F_FIXED_FILE is set\nindependently from the generic IOSQE_FIXED_FILE sqe flag during request\ninit, before the issue handler runs.\n\nIf a NOP is submitted with IOSQE_FIXED_FILE set (so REQ_F_FIXED_FILE is\nset) but without IORING_NOP_FIXED_FILE, io_nop() takes the normal path\nand grabs a real reference via io_file_get_normal(). On completion,\nio_put_file() only drops the reference when REQ_F_FIXED_FILE is clear,\nso the fget()'d file is never released and leaks:\n\n  BUG: memory leak\n  unreferenced object 0xffff88800f42c240 (size 176):\n    kmem_cache_alloc_noprof+0x358/0x440\n    alloc_empty_file+0x57/0x180\n    path_openat+0x44/0x1e50\n    do_file_open+0x121/0x200\n    do_sys_openat2+0xa7/0x150\n    __x64_sys_openat+0x82/0xf0\n\nDecide between fixed and normal file acquisition from REQ_F_FIXED_FILE,\nthe same way io_assign_file() does for every other opcode, and fold\nIORING_NOP_FIXED_FILE into REQ_F_FIXED_FILE at prep time.","Type":"Description","Title":"io_uring/nop: fix file reference leak with IOSQE_FIXED_FILE"}]}}}