CVE-2026-97919
UnknownSummary
In the Linux kernel tracing subsystem there is a use-after-free bug. event_hist_trigger_named_init() first publishes the trigger on the global named_triggers list and only then takes the reference; if initialization fails, the trigger is not removed from the list and gets freed, so the next lookup by name reads the freed object.
Risk Assessment
This can lead to reading freed kernel memory, risking a system crash or potential code execution in kernel context. It occurs in environments using named histogram triggers.
Recommendation
Update the Linux kernel to a version with the fix that takes the reference first and publishes only after success. Until then, limit the use of named histogram triggers.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: tracing: Take the reference before publishing the named histogram trigger event_hist_trigger_named_init() puts the trigger on the global named_triggers list and only then takes the reference on the trigger it shares its histogram with: data->ref++; save_named_trigger(data->named_data->name, data); ret = event_hist_trigger_init(data->named_data); if (ret < 0) { kfree(data->cmd_ops); data->cmd_ops = &trigger_hist_cmd; } return ret; event_hist_trigger_init() fails when alloc_hist_pad() cannot allocate, and nothing takes the trigger back off the list on the way out. event_hist_trigger_parse() frees it, and the next lookup by name reads the freed object: BUG: KASAN: slab-use-after-free in find_named_trigger+0xac/0xc0 Read of size 8 at addr ffff888009346860 by task init/1 find_named_trigger+0xac/0xc0 hist_register_trigger+0xc1/0xa00 event_hist_trigger_parse+0x3146/0x6af0 event_trigger_write+0xce/0x160 Freed by task 67: kfree+0x154/0x420 trigger_kthread_fn+0xfd/0x160 Do the reference first and publish once it has succeeded, so that nothing which can fail runs after the trigger becomes findable.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS