{"id":"CVE-2026-89501","title":"ring-buffer: Hold cpu_buffer::lock when resizing a subbuf","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Hold cpu_buffer::lock when resizing a subbuf\n\nBecause, ring_buffer_subbuf_order_set() can clear cpu_buffer->free_page,\nhold cpu_buffer->lock to prevent rac…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-413"],"vendor":"Linux","product":"Linux","affected":["Linux >= 8e7b58c27b3c567316a51079b375b846f9223bba < 8a496aaa3da6e8d545896c2370c7e617cc931ae2","Linux >= 8e7b58c27b3c567316a51079b375b846f9223bba < 6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2","Linux >= 8e7b58c27b3c567316a51079b375b846f9223bba < bf242baf58de03467f226c8e29554c9495dca7fc","Linux >= 8e7b58c27b3c567316a51079b375b846f9223bba < 24974bd0da1b47fd56c975533ead50abf754e74d","Linux 6.8"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:47:52.839Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89501","references":[{"url":"https://git.kernel.org/stable/c/8a496aaa3da6e8d545896c2370c7e617cc931ae2"},{"url":"https://git.kernel.org/stable/c/6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2"},{"url":"https://git.kernel.org/stable/c/bf242baf58de03467f226c8e29554c9495dca7fc"},{"url":"https://git.kernel.org/stable/c/24974bd0da1b47fd56c975533ead50abf754e74d"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89501.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89501"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532254"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89501"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89501"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89501.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00168,"epssPercentile":0.06065,"scores":{"cna":7.8,"vendor":7},"ingestedAt":"2026-09-14T15:23:07.475Z","slug":"CVE-2026-89501","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Hold cpu_buffer::lock when resizing a subbuf\n\nBecause, ring_buffer_subbuf_order_set() can clear cpu_buffer->free_page,\nhold cpu_buffer->lock to prevent races with\nring_buffer_alloc_read_page() and ring_buffer_free_read_page().\n\n## Affected\n\n- `Linux >= 8e7b58c27b3c567316a51079b375b846f9223bba < 8a496aaa3da6e8d545896c2370c7e617cc931ae2`\n- `Linux >= 8e7b58c27b3c567316a51079b375b846f9223bba < 6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2`\n- `Linux >= 8e7b58c27b3c567316a51079b375b846f9223bba < bf242baf58de03467f226c8e29554c9495dca7fc`\n- `Linux >= 8e7b58c27b3c567316a51079b375b846f9223bba < 24974bd0da1b47fd56c975533ead50abf754e74d`\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** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89501.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224728,"id":"CVE-2026-89501","ts":1792401506421,"field":"cvss","old":"7","new":"7.8"},{"seq":206946,"id":"CVE-2026-89501","ts":1789749711555,"field":"cvss","old":"4.7","new":"7"},{"seq":206945,"id":"CVE-2026-89501","ts":1789749711555,"field":"severity","old":"medium","new":"high"},{"seq":202901,"id":"CVE-2026-89501","ts":1789403732870,"field":"cvss","old":"7.8","new":"4.7"},{"seq":202900,"id":"CVE-2026-89501","ts":1789403732870,"field":"severity","old":"high","new":"medium"},{"seq":197994,"id":"CVE-2026-89501","ts":1789384321294,"field":"cvss","old":"4.7","new":"7.8"},{"seq":197993,"id":"CVE-2026-89501","ts":1789384321294,"field":"severity","old":"medium","new":"high"},{"seq":183510,"id":"CVE-2026-89501","ts":1789356675664,"field":"cvss","old":"7.8","new":"4.7"},{"seq":183509,"id":"CVE-2026-89501","ts":1789356675664,"field":"severity","old":"high","new":"medium"},{"seq":153292,"id":"CVE-2026-89501","ts":1789285349913,"field":"cvss","old":null,"new":"7.8"},{"seq":153291,"id":"CVE-2026-89501","ts":1789285349913,"field":"severity","old":"none","new":"high"},{"seq":147496,"id":"CVE-2026-89501","ts":1789270211136,"field":"cvss","old":null,"new":"4.7"},{"seq":147495,"id":"CVE-2026-89501","ts":1789270211136,"field":"severity","old":"none","new":"medium"},{"seq":109250,"id":"CVE-2026-89501","ts":1789183731144,"field":"cvss","old":null,"new":"4.7"},{"seq":109249,"id":"CVE-2026-89501","ts":1789183731144,"field":"severity","old":"none","new":"medium"}]}