{"api_version":"1","generated_at":"2026-09-11T23:40:10+00:00","cve":"CVE-2026-89748","urls":{"html":"https://cve.report/CVE-2026-89748","api":"https://cve.report/api/cve/CVE-2026-89748.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89748","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89748"},"summary":{"title":"tracing: Fix retry exhaustion in simple ring buffer reader swap","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix retry exhaustion in simple ring buffer reader swap\n\nsimple_ring_buffer_swap_reader_page() starts with retry set to 8 and\npost-decrements it only after a failed link replacement. On the final\nattempt, a successful replacement leaves retry at zero, while a failed\nreplacement leaves it at -1.\n\nThe current !retry test reverses both outcomes. It returns an error after\na successful final replacement, leaving the link update complete but the\nreader bookkeeping unfinished. After a failed final replacement, it\nfalls through and updates the head and reader pointers as though the\nreplacement succeeded, which can corrupt the ring.\n\nTreat only a negative counter as exhaustion and return the documented\n-EBUSY error.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:20:05","updated_at":"2026-09-11 20:20:05"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/e0d3aed7b12cf37b74c7cc5265073d0263b49cde","name":"https://git.kernel.org/stable/c/e0d3aed7b12cf37b74c7cc5265073d0263b49cde","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/df02489aa3aa1834659f0d20c89f7d212047d268","name":"https://git.kernel.org/stable/c/df02489aa3aa1834659f0d20c89f7d212047d268","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89748","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89748","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 34e5b958bdad0f9cf16306368bbc2dc5b2a50143 df02489aa3aa1834659f0d20c89f7d212047d268 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 34e5b958bdad0f9cf16306368bbc2dc5b2a50143 e0d3aed7b12cf37b74c7cc5265073d0263b49cde git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.1","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 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/simple_ring_buffer.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"df02489aa3aa1834659f0d20c89f7d212047d268","status":"affected","version":"34e5b958bdad0f9cf16306368bbc2dc5b2a50143","versionType":"git"},{"lessThan":"e0d3aed7b12cf37b74c7cc5265073d0263b49cde","status":"affected","version":"34e5b958bdad0f9cf16306368bbc2dc5b2a50143","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/trace/simple_ring_buffer.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"7.1"},{"lessThan":"7.1","status":"unaffected","version":"0","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":"7.2.4","versionStartIncluding":"7.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"7.1","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix retry exhaustion in simple ring buffer reader swap\n\nsimple_ring_buffer_swap_reader_page() starts with retry set to 8 and\npost-decrements it only after a failed link replacement. On the final\nattempt, a successful replacement leaves retry at zero, while a failed\nreplacement leaves it at -1.\n\nThe current !retry test reverses both outcomes. It returns an error after\na successful final replacement, leaving the link update complete but the\nreader bookkeeping unfinished. After a failed final replacement, it\nfalls through and updates the head and reader pointers as though the\nreplacement succeeded, which can corrupt the ring.\n\nTreat only a negative counter as exhaustion and return the documented\n-EBUSY error."}],"providerMetadata":{"dateUpdated":"2026-09-11T19:46:53.070Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/df02489aa3aa1834659f0d20c89f7d212047d268"},{"url":"https://git.kernel.org/stable/c/e0d3aed7b12cf37b74c7cc5265073d0263b49cde"}],"title":"tracing: Fix retry exhaustion in simple ring buffer reader swap","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89748","datePublished":"2026-09-11T19:46:53.070Z","dateReserved":"2026-09-11T19:38:34.762Z","dateUpdated":"2026-09-11T19:46:53.070Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:20:05","lastModifiedDate":"2026-09-11 20:20:05","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89748","Ordinal":"1","Title":"tracing: Fix retry exhaustion in simple ring buffer reader swap","CVE":"CVE-2026-89748","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89748","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix retry exhaustion in simple ring buffer reader swap\n\nsimple_ring_buffer_swap_reader_page() starts with retry set to 8 and\npost-decrements it only after a failed link replacement. On the final\nattempt, a successful replacement leaves retry at zero, while a failed\nreplacement leaves it at -1.\n\nThe current !retry test reverses both outcomes. It returns an error after\na successful final replacement, leaving the link update complete but the\nreader bookkeeping unfinished. After a failed final replacement, it\nfalls through and updates the head and reader pointers as though the\nreplacement succeeded, which can corrupt the ring.\n\nTreat only a negative counter as exhaustion and return the documented\n-EBUSY error.","Type":"Description","Title":"tracing: Fix retry exhaustion in simple ring buffer reader swap"}]}}}