CVE-2023-52473: thermal: core: Fix NULL pointer dereference in zone registration error path
In the Linux kernel, the following vulnerability has been resolved:
thermal: core: Fix NULL pointer dereference in zone registration error path
If deviceregister() in thermalzonedeviceregisterwithtrips() returns an error, the tz variable is set to NULL and subsequently dereferenced in kfree(tz->tzp).
Commit adc8749b150c ("thermal/drivers/core: Use putdevice() if deviceregister() fails") added the tz = NULL assignment in question to avoid a possible double-free after dropping the reference to the zone device. However, after commit 4649620d9404 ("thermal: core: Make thermalzonedeviceunregister() return after freeing the zone"), that assignment has become redundant, because dropping the reference to the zone device does not cause the zone object to be freed any more.
Drop it to address the NULL pointer dereference.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/linuxto a version that resolves this vulnerability.Fixed in 5.10.223-1Fixed in 5.10.234-1Fixed in 6.1.129-1Fixed in 6.1.135-1Fixed in 6.12.22-1Fixed in 6.12.25-1 - Upgrade
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redhat/kernelto a version that resolves this vulnerability.Fixed in 6.6.14 - Upgrade
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redhat/kernelto a version that resolves this vulnerability.Fixed in 6.7.2
Event History
Frequently Asked Questions
What is the severity of CVE-2023-52473?
CVE-2023-52473 has a moderate severity rating due to the potential for NULL pointer dereference leading to a system crash.
How do I fix CVE-2023-52473?
To remediate CVE-2023-52473, update your Linux kernel to version 6.6.14, 6.7.2, or apply the relevant patches provided by your distribution.
Which Linux distributions are affected by CVE-2023-52473?
CVE-2023-52473 affects multiple distributions running the Linux kernel versions between 6.4.0 to 6.6.14 and also includes certain versions in the 6.7.x series.
What components of the Linux kernel are affected by CVE-2023-52473?
CVE-2023-52473 specifically impacts the thermal core subsystem in the Linux kernel.
Is CVE-2023-52473 an exploit in the Linux kernel?
CVE-2023-52473 is a vulnerability that could be exploited to cause a system crash, but it is not classified as a direct exploit.