CVE-2023-54026 opp: Fix use-after-free in lazy_opp_tables after probe deferral

What is CVE-2023-54026?

CVE-2023-54026 is a high-severity use after free vulnerability in Linux, published on 24 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

opp: Fix use-after-free in lazy_opp_tables after probe deferral

When dev_pm_opp_of_find_icc_paths() in _allocate_opp_table() returns -EPROBE_DEFER, the opp_table is freed again, to wait until all the interconnect paths are available.

However, if the OPP table is using required-opps then it may already have been added to the global lazy_opp_tables list. The error path does not remove the opp_table from the list again.

This can cause crashes later when the provider of the required-opps is added, since we will iterate over OPP tables that have already been freed. E.g.:

Unable to handle kernel NULL pointer dereference when read CPU: 0 PID: 7 Comm: kworker/0:0 Not tainted 6.4.0-rc3 PC is at _of_add_opp_table_v2 (include/linux/of.h:949 drivers/opp/of.c:98 drivers/opp/of.c:344 drivers/opp/of.c:404 drivers/opp/of.c:1032) -> lazy_link_required_opp_table()

Fix this by calling _of_clear_opp_table() to remove the opp_table from the list and clear other allocated resources. While at it, also add the missing mutex_destroy() calls in the error path.

Which versions are affected by CVE-2023-54026?

How do I fix CVE-2023-54026?

Apply the vendor's patch.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2023-54026 being exploited?

There is no known exploitation of CVE-2023-54026 in the wild and no public exploit code.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2023-54026, DEBIAN-CVE-2023-54026, GHSA-m34w-8vx7-2jww, UBUNTU-CVE-2023-54026.