CVE-2023-54026

Technical 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 o

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