{"id":"CVE-2026-92520","state":"PUBLISHED","title":"bpf: Zero queue and stack outputs on lock failure","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Zero queue and stack outputs on lock failure\n\nQueue and stack pop/peek helpers accept an uninitialized output buffer\nbecause the verifier expects the helper to initialize it. The empty-map\nerror path clears the buffer, but a failed lock acquisition returns\n-EBUSY without writing it.\n\nClear the output before returning -EBUSY so BPF programs cannot observe\nuninitialized stack contents after a failed helper call.","publishedAt":"2026-09-17T16:10:27.447Z","updatedAt":"2026-10-30T12:35:45.323Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e388671635acf470f0986d874389148fd234620b","status":"affected","lessThan":"6468e8ac026b44ae2a78114b80f9d1b9164d0f6c","versionType":"git"},{"version":"a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8","status":"affected","lessThan":"a6090eeb289c5fa45f7b629befac2bd3c19a6dae","versionType":"git"},{"version":"a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8","status":"affected","lessThan":"23b4bcc79bab5285275912b94e98c286f281de75","versionType":"git"},{"version":"a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8","status":"affected","lessThan":"1534c4bff3aaca19c4c9a82f93e9b81f7c983de3","versionType":"git"},{"version":"a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8","status":"affected","lessThan":"e2396b8a562073787e627a5f483f1bc5c452fa6a","versionType":"git"},{"version":"a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8","status":"affected","lessThan":"7ac6e1ae41a09f1dd4baeeff1d028ae49ee01232","versionType":"git"},{"version":"40e34ea01748e5b8afdd40a172868be1e1ab0ede","status":"affected","versionType":"git"},{"version":"388c9d3eefaea99828ee5000c693128a5b41ee7c","status":"affected","versionType":"git"},{"version":"acabf5df49aa3a4f9c96200102d893351b511a88","status":"affected","versionType":"git"},{"version":"232f0ba4d69263af5912e279fcc32fef2882b1dc","status":"affected","versionType":"git"},{"version":"6.1.56","status":"affected","lessThan":"6.1.191","versionType":"semver"},{"version":"5.4.258","status":"affected","lessThan":"5.5","versionType":"semver"},{"version":"5.10.198","status":"affected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.134","status":"affected","lessThan":"5.16","versionType":"semver"},{"version":"6.5.6","status":"affected","lessThan":"6.6","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/queue_stack_maps.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/queue_stack_maps.c"]}],"references":["https://git.kernel.org/stable/c/6468e8ac026b44ae2a78114b80f9d1b9164d0f6c","https://git.kernel.org/stable/c/a6090eeb289c5fa45f7b629befac2bd3c19a6dae","https://git.kernel.org/stable/c/23b4bcc79bab5285275912b94e98c286f281de75","https://git.kernel.org/stable/c/1534c4bff3aaca19c4c9a82f93e9b81f7c983de3","https://git.kernel.org/stable/c/e2396b8a562073787e627a5f483f1bc5c452fa6a","https://git.kernel.org/stable/c/7ac6e1ae41a09f1dd4baeeff1d028ae49ee01232"],"weaknesses":[],"ingestedAt":"2026-10-30T12:54:04.478Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/92xxx/CVE-2026-92520.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-92520","state":"PUBLISHED","datePublished":"2026-09-17T16:10:27.447Z","dateUpdated":"2026-10-30T12:35:45.323Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-16T12:21:13.874Z"},"containers":{"cna":{"title":"bpf: Zero queue and stack outputs on lock failure","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Zero queue and stack outputs on lock failure\n\nQueue and stack pop/peek helpers accept an uninitialized output buffer\nbecause the verifier expects the helper to initialize it. The empty-map\nerror path clears the buffer, but a failed lock acquisition returns\n-EBUSY without writing it.\n\nClear the output before returning -EBUSY so BPF programs cannot observe\nuninitialized stack contents after a failed helper call."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e388671635acf470f0986d874389148fd234620b","status":"affected","lessThan":"6468e8ac026b44ae2a78114b80f9d1b9164d0f6c","versionType":"git"},{"version":"a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8","status":"affected","lessThan":"a6090eeb289c5fa45f7b629befac2bd3c19a6dae","versionType":"git"},{"version":"a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8","status":"affected","lessThan":"23b4bcc79bab5285275912b94e98c286f281de75","versionType":"git"},{"version":"a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8","status":"affected","lessThan":"1534c4bff3aaca19c4c9a82f93e9b81f7c983de3","versionType":"git"},{"version":"a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8","status":"affected","lessThan":"e2396b8a562073787e627a5f483f1bc5c452fa6a","versionType":"git"},{"version":"a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8","status":"affected","lessThan":"7ac6e1ae41a09f1dd4baeeff1d028ae49ee01232","versionType":"git"},{"version":"40e34ea01748e5b8afdd40a172868be1e1ab0ede","status":"affected","versionType":"git"},{"version":"388c9d3eefaea99828ee5000c693128a5b41ee7c","status":"affected","versionType":"git"},{"version":"acabf5df49aa3a4f9c96200102d893351b511a88","status":"affected","versionType":"git"},{"version":"232f0ba4d69263af5912e279fcc32fef2882b1dc","status":"affected","versionType":"git"},{"version":"6.1.56","status":"affected","lessThan":"6.1.191","versionType":"semver"},{"version":"5.4.258","status":"affected","lessThan":"5.5","versionType":"semver"},{"version":"5.10.198","status":"affected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.134","status":"affected","lessThan":"5.16","versionType":"semver"},{"version":"6.5.6","status":"affected","lessThan":"6.6","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/queue_stack_maps.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/queue_stack_maps.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/6468e8ac026b44ae2a78114b80f9d1b9164d0f6c"},{"url":"https://git.kernel.org/stable/c/a6090eeb289c5fa45f7b629befac2bd3c19a6dae"},{"url":"https://git.kernel.org/stable/c/23b4bcc79bab5285275912b94e98c286f281de75"},{"url":"https://git.kernel.org/stable/c/1534c4bff3aaca19c4c9a82f93e9b81f7c983de3"},{"url":"https://git.kernel.org/stable/c/e2396b8a562073787e627a5f483f1bc5c452fa6a"},{"url":"https://git.kernel.org/stable/c/7ac6e1ae41a09f1dd4baeeff1d028ae49ee01232"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:35:45.323Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.56","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.258"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.198"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5.6"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}