{"id":"CVE-2026-89502","title":"ring-buffer: Free cpu_buffer::free_page with subbuf_order","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Free cpu_buffer::free_page with subbuf_order\n\nWhen sub-buffers use an order greater than 0, cpu_buffer->free_page is\nallocated with subbuf_order. Use the c…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-763"],"vendor":"Linux","product":"Linux","affected":["Linux >= f9b94daa542a8d2532f0930f01cd9aec2d19621b < 77275ccea06eaf297e8e6ac3fc830cb72086379a","Linux >= f9b94daa542a8d2532f0930f01cd9aec2d19621b < 8c1ecdcdea738efe0494af908f12c0ae3a97fffa","Linux >= f9b94daa542a8d2532f0930f01cd9aec2d19621b < 81063bbb16c4fcf0136c9117d5e49d3621dd6a1e","Linux >= f9b94daa542a8d2532f0930f01cd9aec2d19621b < 234b1a72e9706fe20c08c96f4374ec8e83b934cb","Linux 6.8"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:47:53.802Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89502","references":[{"url":"https://git.kernel.org/stable/c/77275ccea06eaf297e8e6ac3fc830cb72086379a"},{"url":"https://git.kernel.org/stable/c/8c1ecdcdea738efe0494af908f12c0ae3a97fffa"},{"url":"https://git.kernel.org/stable/c/81063bbb16c4fcf0136c9117d5e49d3621dd6a1e"},{"url":"https://git.kernel.org/stable/c/234b1a72e9706fe20c08c96f4374ec8e83b934cb"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89502.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89502"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532342"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89502"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89502"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89502.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00206,"epssPercentile":0.10483,"ingestedAt":"2026-09-14T11:11:19.887Z","slug":"CVE-2026-89502","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Free cpu_buffer::free_page with subbuf_order\n\nWhen sub-buffers use an order greater than 0, cpu_buffer->free_page is\nallocated with subbuf_order. Use the correct order for\ncpu_buffer->free_page.\n\n## Affected\n\n- `Linux >= f9b94daa542a8d2532f0930f01cd9aec2d19621b < 77275ccea06eaf297e8e6ac3fc830cb72086379a`\n- `Linux >= f9b94daa542a8d2532f0930f01cd9aec2d19621b < 8c1ecdcdea738efe0494af908f12c0ae3a97fffa`\n- `Linux >= f9b94daa542a8d2532f0930f01cd9aec2d19621b < 81063bbb16c4fcf0136c9117d5e49d3621dd6a1e`\n- `Linux >= f9b94daa542a8d2532f0930f01cd9aec2d19621b < 234b1a72e9706fe20c08c96f4374ec8e83b934cb`\n- `Linux 6.8`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89502.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205500,"id":"CVE-2026-89502","ts":1789576722247,"field":"cvss","old":"4.4","new":"5.5"},{"seq":204019,"id":"CVE-2026-89502","ts":1789490231072,"field":"cvss","old":null,"new":"4.4"},{"seq":204018,"id":"CVE-2026-89502","ts":1789490231072,"field":"severity","old":"none","new":"medium"},{"seq":147357,"id":"CVE-2026-89502","ts":1789270210588,"field":"cvss","old":null,"new":"4.4"},{"seq":147356,"id":"CVE-2026-89502","ts":1789270210588,"field":"severity","old":"none","new":"medium"},{"seq":109110,"id":"CVE-2026-89502","ts":1789183730342,"field":"cvss","old":null,"new":"4.4"},{"seq":109109,"id":"CVE-2026-89502","ts":1789183730342,"field":"severity","old":"none","new":"medium"}]}