{"api_version":"1","generated_at":"2026-08-23T08:38:07+00:00","cve":"CVE-2026-74634","urls":{"html":"https://cve.report/CVE-2026-74634","api":"https://cve.report/api/cve/CVE-2026-74634.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74634","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74634"},"summary":{"title":"ring-buffer: Prevent subbuf order change when resizing is disabled","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Prevent subbuf order change when resizing is disabled\n\nBecause ring_buffer_subbuf_order_set() frees buffer pages, we can't\nallow it when resizing is disabled. A non-consuming reader is at risk of\nuse-after-free (rb_advance_iter()).\n\nReturn -EBUSY on resize_disabled, matching ring_buffer_resize()\nbehaviour.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-22 16:16:36","updated_at":"2026-08-22 16:16:36"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/62978cf6347972c04130e4e841ba404504d92b32","name":"https://git.kernel.org/stable/c/62978cf6347972c04130e4e841ba404504d92b32","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b45b91db41379ee5fb36c187d6d7c37b725cbe8e","name":"https://git.kernel.org/stable/c/b45b91db41379ee5fb36c187d6d7c37b725cbe8e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7568e9e717e7540bd05bcc007f5d76fcaff3cdff","name":"https://git.kernel.org/stable/c/7568e9e717e7540bd05bcc007f5d76fcaff3cdff","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bf98d7b0d5a99991e47e66cee4eb1d3fa514be97","name":"https://git.kernel.org/stable/c/bf98d7b0d5a99991e47e66cee4eb1d3fa514be97","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74634","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74634","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f9b94daa542a8d2532f0930f01cd9aec2d19621b b45b91db41379ee5fb36c187d6d7c37b725cbe8e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f9b94daa542a8d2532f0930f01cd9aec2d19621b 62978cf6347972c04130e4e841ba404504d92b32 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f9b94daa542a8d2532f0930f01cd9aec2d19621b 7568e9e717e7540bd05bcc007f5d76fcaff3cdff git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f9b94daa542a8d2532f0930f01cd9aec2d19621b bf98d7b0d5a99991e47e66cee4eb1d3fa514be97 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.8","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.8 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.104 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.45 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.9 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * 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/trace/ring_buffer.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b45b91db41379ee5fb36c187d6d7c37b725cbe8e","status":"affected","version":"f9b94daa542a8d2532f0930f01cd9aec2d19621b","versionType":"git"},{"lessThan":"62978cf6347972c04130e4e841ba404504d92b32","status":"affected","version":"f9b94daa542a8d2532f0930f01cd9aec2d19621b","versionType":"git"},{"lessThan":"7568e9e717e7540bd05bcc007f5d76fcaff3cdff","status":"affected","version":"f9b94daa542a8d2532f0930f01cd9aec2d19621b","versionType":"git"},{"lessThan":"bf98d7b0d5a99991e47e66cee4eb1d3fa514be97","status":"affected","version":"f9b94daa542a8d2532f0930f01cd9aec2d19621b","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/trace/ring_buffer.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.8"},{"lessThan":"6.8","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.104","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.45","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.104","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.45","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.9","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"6.8","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Prevent subbuf order change when resizing is disabled\n\nBecause ring_buffer_subbuf_order_set() frees buffer pages, we can't\nallow it when resizing is disabled. A non-consuming reader is at risk of\nuse-after-free (rb_advance_iter()).\n\nReturn -EBUSY on resize_disabled, matching ring_buffer_resize()\nbehaviour."}],"providerMetadata":{"dateUpdated":"2026-08-22T15:32:14.547Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/b45b91db41379ee5fb36c187d6d7c37b725cbe8e"},{"url":"https://git.kernel.org/stable/c/62978cf6347972c04130e4e841ba404504d92b32"},{"url":"https://git.kernel.org/stable/c/7568e9e717e7540bd05bcc007f5d76fcaff3cdff"},{"url":"https://git.kernel.org/stable/c/bf98d7b0d5a99991e47e66cee4eb1d3fa514be97"}],"title":"ring-buffer: Prevent subbuf order change when resizing is disabled","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74634","datePublished":"2026-08-22T15:32:14.547Z","dateReserved":"2026-08-15T05:44:03.922Z","dateUpdated":"2026-08-22T15:32:14.547Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-22 16:16:36","lastModifiedDate":"2026-08-22 16:16:36","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74634","Ordinal":"1","Title":"ring-buffer: Prevent subbuf order change when resizing is disabl","CVE":"CVE-2026-74634","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74634","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Prevent subbuf order change when resizing is disabled\n\nBecause ring_buffer_subbuf_order_set() frees buffer pages, we can't\nallow it when resizing is disabled. A non-consuming reader is at risk of\nuse-after-free (rb_advance_iter()).\n\nReturn -EBUSY on resize_disabled, matching ring_buffer_resize()\nbehaviour.","Type":"Description","Title":"ring-buffer: Prevent subbuf order change when resizing is disabl"}]}}}