{"api_version":"1","generated_at":"2026-09-18T02:14:52+00:00","cve":"CVE-2026-93045","urls":{"html":"https://cve.report/CVE-2026-93045","api":"https://cve.report/api/cve/CVE-2026-93045.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-93045","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-93045"},"summary":{"title":"bpf: Reject arena frees below the arena base","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject arena frees below the arena base\n\nbpf_arena_free_pages() accepts scalar arena addresses. The runtime\nmasks the address to the low 32 bits and reconstructs a full user\naddress from the arena base before returning the range to the arena\nfree tree.\n\nWhen the scalar value is below the low 32 bits of the arena base,\nfull_uaddr falls below user_vm_start. The existing upper-end clipping\nthen turns this into an out-of-range free-tree offset. A later\nallocation can reuse that offset and return an address below the arena\nmapping.\n\nReject such frees before computing the clipped range.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:17:57","updated_at":"2026-09-17 17:17:57"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/b5a71cb2db6d84ac0042549dcec266b18429d41e","name":"https://git.kernel.org/stable/c/b5a71cb2db6d84ac0042549dcec266b18429d41e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8a08635656037aee9c12231ed384449c4ffb1a93","name":"https://git.kernel.org/stable/c/8a08635656037aee9c12231ed384449c4ffb1a93","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20","name":"https://git.kernel.org/stable/c/a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/90453eaf8f14e7be0ab03983f2a93aeb6b990a58","name":"https://git.kernel.org/stable/c/90453eaf8f14e7be0ab03983f2a93aeb6b990a58","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93045","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93045","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 317460317a02a1af512697e6e964298dedd8a163 90453eaf8f14e7be0ab03983f2a93aeb6b990a58 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 317460317a02a1af512697e6e964298dedd8a163 a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 317460317a02a1af512697e6e964298dedd8a163 8a08635656037aee9c12231ed384449c4ffb1a93 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 317460317a02a1af512697e6e964298dedd8a163 b5a71cb2db6d84ac0042549dcec266b18429d41e 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 6.12.110 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":["kernel/bpf/arena.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"90453eaf8f14e7be0ab03983f2a93aeb6b990a58","status":"affected","version":"317460317a02a1af512697e6e964298dedd8a163","versionType":"git"},{"lessThan":"a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20","status":"affected","version":"317460317a02a1af512697e6e964298dedd8a163","versionType":"git"},{"lessThan":"8a08635656037aee9c12231ed384449c4ffb1a93","status":"affected","version":"317460317a02a1af512697e6e964298dedd8a163","versionType":"git"},{"lessThan":"b5a71cb2db6d84ac0042549dcec266b18429d41e","status":"affected","version":"317460317a02a1af512697e6e964298dedd8a163","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/bpf/arena.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":"6.12.110","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":"6.12.110","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"6.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject arena frees below the arena base\n\nbpf_arena_free_pages() accepts scalar arena addresses. The runtime\nmasks the address to the low 32 bits and reconstructs a full user\naddress from the arena base before returning the range to the arena\nfree tree.\n\nWhen the scalar value is below the low 32 bits of the arena base,\nfull_uaddr falls below user_vm_start. The existing upper-end clipping\nthen turns this into an out-of-range free-tree offset. A later\nallocation can reuse that offset and return an address below the arena\nmapping.\n\nReject such frees before computing the clipped range."}],"providerMetadata":{"dateUpdated":"2026-09-17T16:10:36.988Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/90453eaf8f14e7be0ab03983f2a93aeb6b990a58"},{"url":"https://git.kernel.org/stable/c/a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20"},{"url":"https://git.kernel.org/stable/c/8a08635656037aee9c12231ed384449c4ffb1a93"},{"url":"https://git.kernel.org/stable/c/b5a71cb2db6d84ac0042549dcec266b18429d41e"}],"title":"bpf: Reject arena frees below the arena base","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-93045","datePublished":"2026-09-17T16:10:36.988Z","dateReserved":"2026-09-17T15:57:05.658Z","dateUpdated":"2026-09-17T16:10:36.988Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:17:57","lastModifiedDate":"2026-09-17 17:17:57","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"93045","Ordinal":"1","Title":"bpf: Reject arena frees below the arena base","CVE":"CVE-2026-93045","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"93045","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject arena frees below the arena base\n\nbpf_arena_free_pages() accepts scalar arena addresses. The runtime\nmasks the address to the low 32 bits and reconstructs a full user\naddress from the arena base before returning the range to the arena\nfree tree.\n\nWhen the scalar value is below the low 32 bits of the arena base,\nfull_uaddr falls below user_vm_start. The existing upper-end clipping\nthen turns this into an out-of-range free-tree offset. A later\nallocation can reuse that offset and return an address below the arena\nmapping.\n\nReject such frees before computing the clipped range.","Type":"Description","Title":"bpf: Reject arena frees below the arena base"}]}}}