VYPR
← All advisories
Medium severity5.5NVD Advisory· Published May 1, 2024· Updated Jun 17, 2026

CVE-2024-26999

CVE-2024-26999

Description

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

serial/pmac_zilog: Remove flawed mitigation for rx irq flood

The mitigation was intended to stop the irq completely. That may be better than a hard lock-up but it turns out that you get a crash anyway if you're using pmac_zilog as a serial console:

ttyPZ0: pmz: rx irq flood ! BUG: spinlock recursion on CPU#0, swapper/0

That's because the pr_err() call in pmz_receive_chars() results in pmz_console_write() attempting to lock a spinlock already locked in pmz_interrupt(). With CONFIG_DEBUG_SPINLOCK=y, this produces a fatal BUG splat. The spinlock in question is the one in struct uart_port.

Even when it's not fatal, the serial port rx function ceases to work. Also, the iteration limit doesn't play nicely with QEMU, as can be seen in the bug report linked below.

A web search for other reports of the error message "pmz: rx irq flood" didn't produce anything. So I don't think this code is needed any more. Remove it.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

105

Patches

Vulnerability mechanics

References

12

News mentions

0

No linked articles in our index yet.