CVE-2026-31744

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> PM: EM: Fix NULL pointer dereference when perf domain ID is not found<br /> <br /> dev_energymodel_nl_get_perf_domains_doit() calls<br /> em_perf_domain_get_by_id() but does not check the return value before<br /> passing it to __em_nl_get_pd_size(). When a caller supplies a<br /> non-existent perf domain ID, em_perf_domain_get_by_id() returns NULL,<br /> and __em_nl_get_pd_size() immediately dereferences pd-&gt;cpus<br /> (struct offset 0x30), causing a NULL pointer dereference.<br /> <br /> The sister handler dev_energymodel_nl_get_perf_table_doit() already<br /> handles this correctly via __em_nl_get_pd_table_id(), which returns<br /> NULL and causes the caller to return -EINVAL. Add the same NULL check<br /> in the get-perf-domains do handler.<br /> <br /> [ rjw: Subject and changelog edits ]