CVE-2024-56739

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

rtc: check if __rtc_read_time was successful in rtc_timer_do_work()

If the __rtc_read_time call fails,, the struct rtc_time tm; may contain uninitialized data, or an illegal date/time read from the RTC hardware.

When calling rtc_tm_to_ktime later, the result may be a very large value (possibly KTIME_MAX). If there are periodic timers in rtc->timerqueue, they will continually expire, may causing kernel softlockup.

Weakness

The product uses or accesses a resource that has not been initialized.

Affected Software

Potential Mitigations

References

• https://git.kernel.org/stable/c/0d68e8514d9040108ff7d1b37ca71096674b6efe
• https://git.kernel.org/stable/c/246f621d363988e7040f4546d20203dc713fa3e1
• https://git.kernel.org/stable/c/39ad0a1ae17b54509cd9e93dcd8cec16e7c12d3f
• https://git.kernel.org/stable/c/44b3257ff705d63d5f00ef8ed314a0eeb7ec37f2
• https://git.kernel.org/stable/c/a1f0b4af90cc18b10261ecde56c6a56b22c75bd1
• https://git.kernel.org/stable/c/dd4b1cbcc916fad5d10c2662b62def9f05e453d4
• https://git.kernel.org/stable/c/e77bce0a8c3989b4173c36f4195122bca8f4a3e1
• https://git.kernel.org/stable/c/e8ba8a2bc4f60a1065f23d6a0e7cbea945a0f40d
• https://git.kernel.org/stable/c/fde56535505dde3336df438e949ef4742b6d6d6e