Bug 2464474 (CVE-2026-31744)

Summary: CVE-2026-31744 kernel: PM: EM: Fix NULL pointer dereference when perf domain ID is not found
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel. When processing energy model performance domains, the dev_energymodel_nl_get_perf_domains_doit() function fails to validate the return value from em_perf_domain_get_by_id(). If a non-existent performance domain ID is provided, this leads to a null pointer dereference, which can cause a system crash and result in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-05-01 15:08:51 UTC 
In the Linux kernel, the following vulnerability has been resolved:

PM: EM: Fix NULL pointer dereference when perf domain ID is not found

dev_energymodel_nl_get_perf_domains_doit() calls
em_perf_domain_get_by_id() but does not check the return value before
passing it to __em_nl_get_pd_size(). When a caller supplies a
non-existent perf domain ID, em_perf_domain_get_by_id() returns NULL,
and __em_nl_get_pd_size() immediately dereferences pd->cpus
(struct offset 0x30), causing a NULL pointer dereference.

The sister handler dev_energymodel_nl_get_perf_table_doit() already
handles this correctly via __em_nl_get_pd_table_id(), which returns
NULL and causes the caller to return -EINVAL. Add the same NULL check
in the get-perf-domains do handler.

[ rjw: Subject and changelog edits ]
Comment 1 Keith Grant 2026-05-01 21:49:54 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050140-CVE-2026-31744-50c5@gregkh/T