CVE-2026-97919

/// Technical description

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/0

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References