{"id":"CVE-2026-99160","title":"ring-buffer: Do not show buffer_meta for CPUs without a buffer","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Do not show buffer_meta for CPUs without a buffer\n\nThe per_cpu/cpuN/buffer_meta files are created for every possible CPU,\nbut buffer->buffers[cpu] is only …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 950032ffcee7a43c960951940059afc5a2bdbcbc < 8512d0312cc0ea83ca4511b164c29a138bbb0c21","Linux >= 950032ffcee7a43c960951940059afc5a2bdbcbc < ae670c1a24fb5ffb167f26358cf47a5f0abbd670","Linux >= 950032ffcee7a43c960951940059afc5a2bdbcbc < 3f23cae09a4677a3f7c163a68388512cb231ff22","Linux 6.12"],"published":"2026-10-28","updated":"2026-10-28","sourceUpdated":"2026-10-28T10:35:13.341Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99160","references":[{"url":"https://git.kernel.org/stable/c/8512d0312cc0ea83ca4511b164c29a138bbb0c21"},{"url":"https://git.kernel.org/stable/c/ae670c1a24fb5ffb167f26358cf47a5f0abbd670"},{"url":"https://git.kernel.org/stable/c/3f23cae09a4677a3f7c163a68388512cb231ff22"}],"tags":["cve.org"],"ingestedAt":"2026-10-28T11:09:40.405Z","slug":"CVE-2026-99160","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Do not show buffer_meta for CPUs without a buffer\n\nThe per_cpu/cpuN/buffer_meta files are created for every possible CPU,\nbut buffer->buffers[cpu] is only allocated once that CPU comes online.\nReading the file of a CPU that never came online dereferences a NULL\ncpu_buffer in rbm_start().\n\nFail the open with -ENODEV when the CPU has no buffer, as the other\nper CPU ring buffer interfaces do.\n\n## Affected\n\n- `Linux >= 950032ffcee7a43c960951940059afc5a2bdbcbc < 8512d0312cc0ea83ca4511b164c29a138bbb0c21`\n- `Linux >= 950032ffcee7a43c960951940059afc5a2bdbcbc < ae670c1a24fb5ffb167f26358cf47a5f0abbd670`\n- `Linux >= 950032ffcee7a43c960951940059afc5a2bdbcbc < 3f23cae09a4677a3f7c163a68388512cb231ff22`\n- `Linux 6.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}