{"id":"CVE-2026-89503","revision":"7716c6af6aab4da0a044c6b51a48038c","records":[{"revision":"7716c6af6aab4da0a044c6b51a48038c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89503","aliases":[],"title":"ring-buffer: Fix subbuf resize race with ring_buffer_alloc_read_page()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Fix subbuf resize race with ring_buffer_alloc_read_page()\n\nring_buffer_alloc_read_page() is racy with ring_buffer_subbuf_order_set,\nit can allocate a reader page with an outdated order. This isn't a big\nissue, the user can still re-allocate a new reader page and try again.\n\nHowever, what is more problematic is if the value of subbuf_order\nchanges in the middle of ring_buffer_alloc_read_page(). In that case,\nbpage->order might not match the actual allocated memory.\n\nUse bpage->order for the allocation to prevent this race.","state":0,"publishedAt":"2026-09-11T19:43:51.357+00:00","modifiedAt":"2026-10-19T08:47:54.761+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"kernel/trace/ring_buffer.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"bce761d757452ba5eb77e11fecc37a04b67494e7\",\n                            \"lessThan\": \"2313ff69bd237aad264a5913907f374f958335a2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"bce761d757452ba5eb77e11fecc37a04b67494e7\",\n                            \"lessThan\": \"2dc510957fe8fd098ab3c3147ebdf34d00cd2734\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"bce761d757452ba5eb77e11fecc37a04b67494e7\",\n                            \"lessThan\": \"53106e9262a310ef2c9a9321168c03705940c678\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"bce761d757452ba5eb77e11fecc37a04b67494e7\",\n                            \"lessThan\": \"e743527c5bfdceda1095bc0a9e596e2aebb6a9c3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"kernel/trace/ring_buffer.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.8\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.112\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/2313ff69bd237aad264a5913907f374f958335a2","https://git.kernel.org/stable/c/2dc510957fe8fd098ab3c3147ebdf34d00cd2734","https://git.kernel.org/stable/c/53106e9262a310ef2c9a9321168c03705940c678","https://git.kernel.org/stable/c/e743527c5bfdceda1095bc0a9e596e2aebb6a9c3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89503","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89503","identifiers":["CVE-2026-89503"]},"retained":false,"historicalAffected":[]}],"coverage":[]}