{"id":"CVE-2026-89748","revision":"ddd8ce3990f34df49092b8b29ec77235","records":[{"revision":"ddd8ce3990f34df49092b8b29ec77235","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89748","aliases":[],"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":0,"publishedAt":"2026-09-11T19:46:53.07+00:00","modifiedAt":"2026-10-19T08:52:02.172+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/simple_ring_buffer.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"34e5b958bdad0f9cf16306368bbc2dc5b2a50143\",\n                            \"lessThan\": \"df02489aa3aa1834659f0d20c89f7d212047d268\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"34e5b958bdad0f9cf16306368bbc2dc5b2a50143\",\n                            \"lessThan\": \"e0d3aed7b12cf37b74c7cc5265073d0263b49cde\",\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/simple_ring_buffer.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"7.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"7.1\",\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/df02489aa3aa1834659f0d20c89f7d212047d268","https://git.kernel.org/stable/c/e0d3aed7b12cf37b74c7cc5265073d0263b49cde"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89748","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89748","identifiers":["CVE-2026-89748"]},"retained":false,"historicalAffected":[]}],"coverage":[]}