medium
5.5
CWE
476
Advisory Published
Updated

CVE-2022-49273: rtc: pl031: fix rtc features null pointer dereference

First published: Wed Feb 26 2025(Updated: )

In the Linux kernel, the following vulnerability has been resolved: rtc: pl031: fix rtc features null pointer dereference When there is no interrupt line, rtc alarm feature is disabled. The clearing of the alarm feature bit was being done prior to allocations of ldata->rtc device, resulting in a null pointer dereference. Clear RTC_FEATURE_ALARM after the rtc device is allocated.

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

Affected SoftwareAffected VersionHow to fix
Linux Kernel>=5.12<5.15.33
Linux Kernel>=5.16<5.16.19
Linux Kernel>=5.17<5.17.2

Remedy

https://git.kernel.org/stable/c/1b915703964f7e636961df04c540261dc55c6c70

Remedy

https://git.kernel.org/stable/c/cd2722e411e8ab7e5ae41102f6925fa13dffdac5

Remedy

https://git.kernel.org/stable/c/d274ce4a3dfd0b9a292667535578359b865765cb

Remedy

https://git.kernel.org/stable/c/ea6af39f3da50c86367a71eb3cc674ade3ed244c

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2022-49273?

    CVE-2022-49273 has a medium severity rating due to the potential for null pointer dereference in the RTC alarm feature.

  • How do I fix CVE-2022-49273?

    To fix CVE-2022-49273, update the Linux kernel to version 5.15.34 or later, 5.16.20 or later, or 5.17.3 or later.

  • Which Linux kernel versions are affected by CVE-2022-49273?

    CVE-2022-49273 affects Linux kernel versions from 5.12 to 5.15.33, from 5.16 to 5.16.19, and from 5.17 to 5.17.2.

  • What component of the Linux kernel is impacted by CVE-2022-49273?

    CVE-2022-49273 impacts the RTC (Real-Time Clock) subsystem within the Linux kernel.

  • Is CVE-2022-49273 exploitable?

    CVE-2022-49273 is considered potentially exploitable because it can lead to unexpected behavior or crashes in systems without an interrupt line.

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