medium
5.5
CWE
476
Advisory Published
Updated

CVE-2023-52473: thermal: core: Fix NULL pointer dereference in zone registration error path

First published: Sun Feb 25 2024(Updated: )

In the Linux kernel, the following vulnerability has been resolved: thermal: core: Fix NULL pointer dereference in zone registration error path If device_register() in thermal_zone_device_register_with_trips() returns an error, the tz variable is set to NULL and subsequently dereferenced in kfree(tz-&gt;tzp). Commit adc8749b150c ("thermal/drivers/core: Use put_device() if device_register() 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 thermal_zone_device_unregister() 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. <a href="https://git.kernel.org/stable/c/02871710b93058eb1249d5847c0b2d1c2c3c98ae">https://git.kernel.org/stable/c/02871710b93058eb1249d5847c0b2d1c2c3c98ae</a> <a href="https://git.kernel.org/stable/c/04e6ccfc93c5a1aa1d75a537cf27e418895e20ea">https://git.kernel.org/stable/c/04e6ccfc93c5a1aa1d75a537cf27e418895e20ea</a> <a href="https://git.kernel.org/stable/c/335176dd8ebaca6493807dceea33c478305667fa">https://git.kernel.org/stable/c/335176dd8ebaca6493807dceea33c478305667fa</a>

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Affected SoftwareAffected VersionHow to fix
redhat/kernel<6.6.14
6.6.14
redhat/kernel<6.7.2
6.7.2
Linux Kernel>=6.4.0<6.6.14
Linux Kernel>=6.7.0<6.7.2
debian/linux
5.10.223-1
5.10.226-1
6.1.123-1
6.1.119-1
6.12.11-1
6.12.12-1

Remedy

https://git.kernel.org/stable/c/02871710b93058eb1249d5847c0b2d1c2c3c98ae

Remedy

https://git.kernel.org/stable/c/04e6ccfc93c5a1aa1d75a537cf27e418895e20ea

Remedy

https://git.kernel.org/stable/c/335176dd8ebaca6493807dceea33c478305667fa

Remedy

https://git.kernel.org/linus/3d439b1a2ad36c8b4ea151c8de25309d60d17407

Remedy

https://git.kernel.org/linus/04e6ccfc93c5a1aa1d75a537cf27e418895e20ea

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Reference Links

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.

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