{"api_version":"1","generated_at":"2026-06-05T06:00:59+00:00","cve":"CVE-2026-45971","urls":{"html":"https://cve.report/CVE-2026-45971","api":"https://cve.report/api/cve/CVE-2026-45971.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-45971","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-45971"},"summary":{"title":"bpf: Limit bpf program signature size","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Limit bpf program signature size\n\nPractical BPF signatures are significantly smaller than\nKMALLOC_MAX_CACHE_SIZE\n\nAllowing larger sizes opens the door for abuse by passing excessive\nsize values and forcing the kernel into expensive allocation paths (via\nkmalloc_large or vmalloc).","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-27 14:17:14","updated_at":"2026-05-27 14:48:03"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/ea1535e28bb3773fc0b3cbd1f3842b808016990c","name":"https://git.kernel.org/stable/c/ea1535e28bb3773fc0b3cbd1f3842b808016990c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5835a077c6f5c565d525eaca9fac01572b97a9b9","name":"https://git.kernel.org/stable/c/5835a077c6f5c565d525eaca9fac01572b97a9b9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/eb8166c79097996396468a341de258a798789d36","name":"https://git.kernel.org/stable/c/eb8166c79097996396468a341de258a798789d36","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-45971","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45971","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 349271568303695f0ac3563af153d2b4542f6986 5835a077c6f5c565d525eaca9fac01572b97a9b9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 349271568303695f0ac3563af153d2b4542f6986 eb8166c79097996396468a341de258a798789d36 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 349271568303695f0ac3563af153d2b4542f6986 ea1535e28bb3773fc0b3cbd1f3842b808016990c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.14 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.4 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"45971","cve":"CVE-2026-45971","epss":"0.000170000","percentile":"0.042650000","score_date":"2026-06-01","updated_at":"2026-06-02 00:05:21"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["kernel/bpf/syscall.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"5835a077c6f5c565d525eaca9fac01572b97a9b9","status":"affected","version":"349271568303695f0ac3563af153d2b4542f6986","versionType":"git"},{"lessThan":"eb8166c79097996396468a341de258a798789d36","status":"affected","version":"349271568303695f0ac3563af153d2b4542f6986","versionType":"git"},{"lessThan":"ea1535e28bb3773fc0b3cbd1f3842b808016990c","status":"affected","version":"349271568303695f0ac3563af153d2b4542f6986","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/bpf/syscall.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.18"},{"lessThan":"6.18","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.14","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.14","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.4","versionStartIncluding":"6.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"6.18","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Limit bpf program signature size\n\nPractical BPF signatures are significantly smaller than\nKMALLOC_MAX_CACHE_SIZE\n\nAllowing larger sizes opens the door for abuse by passing excessive\nsize values and forcing the kernel into expensive allocation paths (via\nkmalloc_large or vmalloc)."}],"providerMetadata":{"dateUpdated":"2026-05-27T12:18:30.651Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/5835a077c6f5c565d525eaca9fac01572b97a9b9"},{"url":"https://git.kernel.org/stable/c/eb8166c79097996396468a341de258a798789d36"},{"url":"https://git.kernel.org/stable/c/ea1535e28bb3773fc0b3cbd1f3842b808016990c"}],"title":"bpf: Limit bpf program signature size","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-45971","datePublished":"2026-05-27T12:18:30.651Z","dateReserved":"2026-05-13T15:03:33.089Z","dateUpdated":"2026-05-27T12:18:30.651Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-27 14:17:14","lastModifiedDate":"2026-05-27 14:48:03","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"45971","Ordinal":"1","Title":"bpf: Limit bpf program signature size","CVE":"CVE-2026-45971","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"45971","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Limit bpf program signature size\n\nPractical BPF signatures are significantly smaller than\nKMALLOC_MAX_CACHE_SIZE\n\nAllowing larger sizes opens the door for abuse by passing excessive\nsize values and forcing the kernel into expensive allocation paths (via\nkmalloc_large or vmalloc).","Type":"Description","Title":"bpf: Limit bpf program signature size"}]}}}