{"api_version":"1","generated_at":"2026-09-17T23:58:41+00:00","cve":"CVE-2026-93174","urls":{"html":"https://cve.report/CVE-2026-93174","api":"https://cve.report/api/cve/CVE-2026-93174.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-93174","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-93174"},"summary":{"title":"bpf: Copy per-CPU map value padding in copy_map_value_long()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Copy per-CPU map value padding in copy_map_value_long()\n\nIn kernel, per-CPU map elements are stored with\nround_up(map->value_size, 8) bytes. On UAPI lookup paths, it copies the\nrounded size for each CPU into a temporary buffer.\n\nHowever, copy_map_value_long() passes 'map->value_size' to\nbpf_obj_memcpy(). When the map has special fields, bpf_obj_memcpy() copies\naround those fields with memcpy(), and does not copy the tail padding\nbetween 'map->value_size' and round_up(map->value_size, 8).\n\nThe temporary UAPI lookup buffers are allocated without __GFP_ZERO. As a\nresult, when the per-CPU map's value size is not equal to\nround_up(map->value_size, 8), UAPI LOOKUP_ELEM and its variants can return\nstale heap contents from that padding to user space. The same issue\napplies to bpf_iter for per-CPU maps.\n\nPass round_up(map->value_size, 8) to bpf_obj_memcpy() from\ncopy_map_value_long(), so per-CPU maps both with and without special\nfields copy the entire per-CPU slot. Remove the now redundant round_up()\nfrom bpf_obj_memcpy()'s long_memcpy path.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:18:13","updated_at":"2026-09-17 17:18:13"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/5e9f69829835521aa2942d1d14bd0990fbc6991e","name":"https://git.kernel.org/stable/c/5e9f69829835521aa2942d1d14bd0990fbc6991e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7cf9cd98cf6f0df3befc167ca6b54c07014d71de","name":"https://git.kernel.org/stable/c/7cf9cd98cf6f0df3befc167ca6b54c07014d71de","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ff3f22ed8d2f350b4c24ee26e33daea5f08d58ef","name":"https://git.kernel.org/stable/c/ff3f22ed8d2f350b4c24ee26e33daea5f08d58ef","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/003bf840ed3326bd01396ce7d5b431cef0d371e7","name":"https://git.kernel.org/stable/c/003bf840ed3326bd01396ce7d5b431cef0d371e7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/953e85da53541a8dc3e7ad4e8532f29a34a32eae","name":"https://git.kernel.org/stable/c/953e85da53541a8dc3e7ad4e8532f29a34a32eae","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93174","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93174","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 448325199f574d33824dbf9121efb03558412966 953e85da53541a8dc3e7ad4e8532f29a34a32eae git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 448325199f574d33824dbf9121efb03558412966 003bf840ed3326bd01396ce7d5b431cef0d371e7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 448325199f574d33824dbf9121efb03558412966 5e9f69829835521aa2942d1d14bd0990fbc6991e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 448325199f574d33824dbf9121efb03558412966 ff3f22ed8d2f350b4c24ee26e33daea5f08d58ef git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 448325199f574d33824dbf9121efb03558412966 7cf9cd98cf6f0df3befc167ca6b54c07014d71de git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.52 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.6 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-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":["include/linux/bpf.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"953e85da53541a8dc3e7ad4e8532f29a34a32eae","status":"affected","version":"448325199f574d33824dbf9121efb03558412966","versionType":"git"},{"lessThan":"003bf840ed3326bd01396ce7d5b431cef0d371e7","status":"affected","version":"448325199f574d33824dbf9121efb03558412966","versionType":"git"},{"lessThan":"5e9f69829835521aa2942d1d14bd0990fbc6991e","status":"affected","version":"448325199f574d33824dbf9121efb03558412966","versionType":"git"},{"lessThan":"ff3f22ed8d2f350b4c24ee26e33daea5f08d58ef","status":"affected","version":"448325199f574d33824dbf9121efb03558412966","versionType":"git"},{"lessThan":"7cf9cd98cf6f0df3befc167ca6b54c07014d71de","status":"affected","version":"448325199f574d33824dbf9121efb03558412966","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["include/linux/bpf.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.1"},{"lessThan":"6.1","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.52","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"6.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"6.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"6.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"6.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"6.1","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Copy per-CPU map value padding in copy_map_value_long()\n\nIn kernel, per-CPU map elements are stored with\nround_up(map->value_size, 8) bytes. On UAPI lookup paths, it copies the\nrounded size for each CPU into a temporary buffer.\n\nHowever, copy_map_value_long() passes 'map->value_size' to\nbpf_obj_memcpy(). When the map has special fields, bpf_obj_memcpy() copies\naround those fields with memcpy(), and does not copy the tail padding\nbetween 'map->value_size' and round_up(map->value_size, 8).\n\nThe temporary UAPI lookup buffers are allocated without __GFP_ZERO. As a\nresult, when the per-CPU map's value size is not equal to\nround_up(map->value_size, 8), UAPI LOOKUP_ELEM and its variants can return\nstale heap contents from that padding to user space. The same issue\napplies to bpf_iter for per-CPU maps.\n\nPass round_up(map->value_size, 8) to bpf_obj_memcpy() from\ncopy_map_value_long(), so per-CPU maps both with and without special\nfields copy the entire per-CPU slot. Remove the now redundant round_up()\nfrom bpf_obj_memcpy()'s long_memcpy path."}],"providerMetadata":{"dateUpdated":"2026-09-17T16:12:03.946Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/953e85da53541a8dc3e7ad4e8532f29a34a32eae"},{"url":"https://git.kernel.org/stable/c/003bf840ed3326bd01396ce7d5b431cef0d371e7"},{"url":"https://git.kernel.org/stable/c/5e9f69829835521aa2942d1d14bd0990fbc6991e"},{"url":"https://git.kernel.org/stable/c/ff3f22ed8d2f350b4c24ee26e33daea5f08d58ef"},{"url":"https://git.kernel.org/stable/c/7cf9cd98cf6f0df3befc167ca6b54c07014d71de"}],"title":"bpf: Copy per-CPU map value padding in copy_map_value_long()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-93174","datePublished":"2026-09-17T16:12:03.946Z","dateReserved":"2026-09-17T16:02:15.090Z","dateUpdated":"2026-09-17T16:12:03.946Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:18:13","lastModifiedDate":"2026-09-17 17:18:13","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"93174","Ordinal":"1","Title":"bpf: Copy per-CPU map value padding in copy_map_value_long()","CVE":"CVE-2026-93174","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"93174","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Copy per-CPU map value padding in copy_map_value_long()\n\nIn kernel, per-CPU map elements are stored with\nround_up(map->value_size, 8) bytes. On UAPI lookup paths, it copies the\nrounded size for each CPU into a temporary buffer.\n\nHowever, copy_map_value_long() passes 'map->value_size' to\nbpf_obj_memcpy(). When the map has special fields, bpf_obj_memcpy() copies\naround those fields with memcpy(), and does not copy the tail padding\nbetween 'map->value_size' and round_up(map->value_size, 8).\n\nThe temporary UAPI lookup buffers are allocated without __GFP_ZERO. As a\nresult, when the per-CPU map's value size is not equal to\nround_up(map->value_size, 8), UAPI LOOKUP_ELEM and its variants can return\nstale heap contents from that padding to user space. The same issue\napplies to bpf_iter for per-CPU maps.\n\nPass round_up(map->value_size, 8) to bpf_obj_memcpy() from\ncopy_map_value_long(), so per-CPU maps both with and without special\nfields copy the entire per-CPU slot. Remove the now redundant round_up()\nfrom bpf_obj_memcpy()'s long_memcpy path.","Type":"Description","Title":"bpf: Copy per-CPU map value padding in copy_map_value_long()"}]}}}