{"id":"CVE-2026-97919","published":"2026-09-25T11:17:18.923","lastModified":"2026-09-25T11:17:18.923","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Take the reference before publishing the named histogram trigger\n\nevent_hist_trigger_named_init() puts the trigger on the global\nnamed_triggers list and only then takes the reference on the trigger it\nshares its histogram with:\n\n\tdata->ref++;\n\n\tsave_named_trigger(data->named_data->name, data);\n\n\tret = event_hist_trigger_init(data->named_data);\n\tif (ret < 0) {\n\t\tkfree(data->cmd_ops);\n\t\tdata->cmd_ops = &trigger_hist_cmd;\n\t}\n\n\treturn ret;\n\nevent_hist_trigger_init() fails when alloc_hist_pad() cannot allocate, and\nnothing takes the trigger back off the list on the way out.\nevent_hist_trigger_parse() frees it, and the next lookup by name reads the\nfreed object:\n\n BUG: KASAN: slab-use-after-free in find_named_trigger+0xac/0xc0\n Read of size 8 at addr ffff888009346860 by task init/1\n  find_named_trigger+0xac/0xc0\n  hist_register_trigger+0xc1/0xa00\n  event_hist_trigger_parse+0x3146/0x6af0\n  event_trigger_write+0xce/0x160\n Freed by task 67:\n  kfree+0x154/0x420\n  trigger_kthread_fn+0xfd/0x160\n\nDo the reference first and publish once it has succeeded, so that nothing\nwhich can fail runs after the trigger becomes findable.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/0fe23b8eaba0d3372c66b7b31204408da0715edc","tags":[]},{"url":"https://git.kernel.org/stable/c/2ffaade3611bd9501bc0b9d5d19fc75bfee7a16b","tags":[]},{"url":"https://git.kernel.org/stable/c/91c15cdda6033e2439f5975b938754152f3d6e38","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}