{"api_version":"1","generated_at":"2026-09-12T12:04:57+00:00","cve":"CVE-2026-89500","urls":{"html":"https://cve.report/CVE-2026-89500","api":"https://cve.report/api/cve/CVE-2026-89500.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89500","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89500"},"summary":{"title":"ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Make cpu_buffer::free_page a buffer_data_read_page\n\nDiscarding a cached reader page after a concurrent ring buffer resize\nuses the new global subbuf_order for the free_pages() call. This\nmismatched order may crashes the kernel or leaks memory because the cached\npage was allocated under the old size.\n\nSave the actual free_page order alongside the page address to ensure we\nalways refer to the correct value and do not rely on the potentially\nstalled cpu_buffer->subbuf_order value. The simplest is to make\nfree_page a buffer_data_read_page which already covers exactly what we\nneed: a page address and a page order.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:19:32","updated_at":"2026-09-11 20:19:32"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/a1dabe68fb53730bc0be60c5dbfd3f4c560084e7","name":"https://git.kernel.org/stable/c/a1dabe68fb53730bc0be60c5dbfd3f4c560084e7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7a1fb95de5404134f8758c1295ce88986bdf117c","name":"https://git.kernel.org/stable/c/7a1fb95de5404134f8758c1295ce88986bdf117c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d787d509bdf6c88c85e095247daf7456cb7fb772","name":"https://git.kernel.org/stable/c/d787d509bdf6c88c85e095247daf7456cb7fb772","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89500","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89500","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8e7b58c27b3c567316a51079b375b846f9223bba a1dabe68fb53730bc0be60c5dbfd3f4c560084e7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8e7b58c27b3c567316a51079b375b846f9223bba d787d509bdf6c88c85e095247daf7456cb7fb772 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8e7b58c27b3c567316a51079b375b846f9223bba 7a1fb95de5404134f8758c1295ce88986bdf117c 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 6.18.51 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.4 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/trace/ring_buffer.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"a1dabe68fb53730bc0be60c5dbfd3f4c560084e7","status":"affected","version":"8e7b58c27b3c567316a51079b375b846f9223bba","versionType":"git"},{"lessThan":"d787d509bdf6c88c85e095247daf7456cb7fb772","status":"affected","version":"8e7b58c27b3c567316a51079b375b846f9223bba","versionType":"git"},{"lessThan":"7a1fb95de5404134f8758c1295ce88986bdf117c","status":"affected","version":"8e7b58c27b3c567316a51079b375b846f9223bba","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":"6.18.*","status":"unaffected","version":"6.18.51","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.4","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":"6.18.51","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.4","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","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: Make cpu_buffer::free_page a buffer_data_read_page\n\nDiscarding a cached reader page after a concurrent ring buffer resize\nuses the new global subbuf_order for the free_pages() call. This\nmismatched order may crashes the kernel or leaks memory because the cached\npage was allocated under the old size.\n\nSave the actual free_page order alongside the page address to ensure we\nalways refer to the correct value and do not rely on the potentially\nstalled cpu_buffer->subbuf_order value. The simplest is to make\nfree_page a buffer_data_read_page which already covers exactly what we\nneed: a page address and a page order."}],"providerMetadata":{"dateUpdated":"2026-09-11T19:43:49.392Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/a1dabe68fb53730bc0be60c5dbfd3f4c560084e7"},{"url":"https://git.kernel.org/stable/c/d787d509bdf6c88c85e095247daf7456cb7fb772"},{"url":"https://git.kernel.org/stable/c/7a1fb95de5404134f8758c1295ce88986bdf117c"}],"title":"ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89500","datePublished":"2026-09-11T19:43:49.392Z","dateReserved":"2026-09-11T19:38:34.715Z","dateUpdated":"2026-09-11T19:43:49.392Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:19:32","lastModifiedDate":"2026-09-11 20:19:32","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89500","Ordinal":"1","Title":"ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page","CVE":"CVE-2026-89500","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89500","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Make cpu_buffer::free_page a buffer_data_read_page\n\nDiscarding a cached reader page after a concurrent ring buffer resize\nuses the new global subbuf_order for the free_pages() call. This\nmismatched order may crashes the kernel or leaks memory because the cached\npage was allocated under the old size.\n\nSave the actual free_page order alongside the page address to ensure we\nalways refer to the correct value and do not rely on the potentially\nstalled cpu_buffer->subbuf_order value. The simplest is to make\nfree_page a buffer_data_read_page which already covers exactly what we\nneed: a page address and a page order.","Type":"Description","Title":"ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page"}]}}}