{"api_version":"1","generated_at":"2026-08-02T13:38:15+00:00","cve":"CVE-2026-64264","urls":{"html":"https://cve.report/CVE-2026-64264","api":"https://cve.report/api/cve/CVE-2026-64264.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64264","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64264"},"summary":{"title":"fuse-uring: fix EFAULT clobber in fuse_uring_commit","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfuse-uring: fix EFAULT clobber in fuse_uring_commit\n\ncopy_from_user() returns the number of bytes not copied as an unsigned\nresidual on failure (1..sizeof(struct fuse_out_header)). fuse_uring_commit\nstores that residual in ssize_t err, sets req->out.h.error to -EFAULT,\nthen jumps to out: with err still holding the positive residual.\n\n    err = copy_from_user(&req->out.h, &ent->headers->in_out,\n                         sizeof(req->out.h));\n    if (err) {\n        req->out.h.error = -EFAULT;\n        goto out;          /* err is the positive residual */\n    }\n    ...\n    out:\n        fuse_uring_req_end(ent, req, err);\n\nfuse_uring_req_end() then runs\n\n    if (error)\n        req->out.h.error = error;\n\nwhich overwrites the just-assigned -EFAULT with the positive residual.\nFUSE callers such as fuse_simple_request() test err < 0 to detect\nfailure, so the positive value is interpreted as success and the\ncaller proceeds with an uninitialised or partial req->out.args.\n\nFix by assigning err = -EFAULT in the failure branch before jumping\nto out, so fuse_uring_req_end() receives a negative errno and sets\nreq->out.h.error to -EFAULT.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:06","updated_at":"2026-07-30 15:00:27"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/fe604c08d874648a69187f6380e5c7858627dc04","name":"https://git.kernel.org/stable/c/fe604c08d874648a69187f6380e5c7858627dc04","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3a0a8bc51a13951c5141262bf770eeea3e0b6228","name":"https://git.kernel.org/stable/c/3a0a8bc51a13951c5141262bf770eeea3e0b6228","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0483fffdeeb363f320e6bf5fc0f0306007507306","name":"https://git.kernel.org/stable/c/0483fffdeeb363f320e6bf5fc0f0306007507306","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64264","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64264","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c090c8abae4b6b77a1bee116aa6c385456ebef96 0483fffdeeb363f320e6bf5fc0f0306007507306 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c090c8abae4b6b77a1bee116aa6c385456ebef96 fe604c08d874648a69187f6380e5c7858627dc04 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c090c8abae4b6b77a1bee116aa6c385456ebef96 3a0a8bc51a13951c5141262bf770eeea3e0b6228 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.14","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.14 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":{"cve_year":"2026","cve_id":"64264","cve":"CVE-2026-64264","epss":"0.001980000","percentile":"0.098420000","score_date":"2026-08-01","updated_at":"2026-08-02 00:11:13"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/fuse/dev_uring.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"0483fffdeeb363f320e6bf5fc0f0306007507306","status":"affected","version":"c090c8abae4b6b77a1bee116aa6c385456ebef96","versionType":"git"},{"lessThan":"fe604c08d874648a69187f6380e5c7858627dc04","status":"affected","version":"c090c8abae4b6b77a1bee116aa6c385456ebef96","versionType":"git"},{"lessThan":"3a0a8bc51a13951c5141262bf770eeea3e0b6228","status":"affected","version":"c090c8abae4b6b77a1bee116aa6c385456ebef96","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/fuse/dev_uring.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.14"},{"lessThan":"6.14","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":"6.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.4","versionStartIncluding":"6.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"6.14","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfuse-uring: fix EFAULT clobber in fuse_uring_commit\n\ncopy_from_user() returns the number of bytes not copied as an unsigned\nresidual on failure (1..sizeof(struct fuse_out_header)). fuse_uring_commit\nstores that residual in ssize_t err, sets req->out.h.error to -EFAULT,\nthen jumps to out: with err still holding the positive residual.\n\n    err = copy_from_user(&req->out.h, &ent->headers->in_out,\n                         sizeof(req->out.h));\n    if (err) {\n        req->out.h.error = -EFAULT;\n        goto out;          /* err is the positive residual */\n    }\n    ...\n    out:\n        fuse_uring_req_end(ent, req, err);\n\nfuse_uring_req_end() then runs\n\n    if (error)\n        req->out.h.error = error;\n\nwhich overwrites the just-assigned -EFAULT with the positive residual.\nFUSE callers such as fuse_simple_request() test err < 0 to detect\nfailure, so the positive value is interpreted as success and the\ncaller proceeds with an uninitialised or partial req->out.args.\n\nFix by assigning err = -EFAULT in the failure branch before jumping\nto out, so fuse_uring_req_end() receives a negative errno and sets\nreq->out.h.error to -EFAULT."}],"providerMetadata":{"dateUpdated":"2026-07-25T08:49:13.891Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/0483fffdeeb363f320e6bf5fc0f0306007507306"},{"url":"https://git.kernel.org/stable/c/fe604c08d874648a69187f6380e5c7858627dc04"},{"url":"https://git.kernel.org/stable/c/3a0a8bc51a13951c5141262bf770eeea3e0b6228"}],"title":"fuse-uring: fix EFAULT clobber in fuse_uring_commit","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64264","datePublished":"2026-07-25T08:49:13.891Z","dateReserved":"2026-07-19T15:36:31.774Z","dateUpdated":"2026-07-25T08:49:13.891Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:06","lastModifiedDate":"2026-07-30 15:00:27","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64264","Ordinal":"1","Title":"fuse-uring: fix EFAULT clobber in fuse_uring_commit","CVE":"CVE-2026-64264","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64264","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nfuse-uring: fix EFAULT clobber in fuse_uring_commit\n\ncopy_from_user() returns the number of bytes not copied as an unsigned\nresidual on failure (1..sizeof(struct fuse_out_header)). fuse_uring_commit\nstores that residual in ssize_t err, sets req->out.h.error to -EFAULT,\nthen jumps to out: with err still holding the positive residual.\n\n    err = copy_from_user(&req->out.h, &ent->headers->in_out,\n                         sizeof(req->out.h));\n    if (err) {\n        req->out.h.error = -EFAULT;\n        goto out;          /* err is the positive residual */\n    }\n    ...\n    out:\n        fuse_uring_req_end(ent, req, err);\n\nfuse_uring_req_end() then runs\n\n    if (error)\n        req->out.h.error = error;\n\nwhich overwrites the just-assigned -EFAULT with the positive residual.\nFUSE callers such as fuse_simple_request() test err < 0 to detect\nfailure, so the positive value is interpreted as success and the\ncaller proceeds with an uninitialised or partial req->out.args.\n\nFix by assigning err = -EFAULT in the failure branch before jumping\nto out, so fuse_uring_req_end() receives a negative errno and sets\nreq->out.h.error to -EFAULT.","Type":"Description","Title":"fuse-uring: fix EFAULT clobber in fuse_uring_commit"}]}}}