Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 2.6.12, < 5.15.157 |
| Debian | Debian Linux | 10.0 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/1be3226445362bfbf461c92a5bcdb1723f2e4907Mailing ListPatch
- https://git.kernel.org/stable/c/52aaf1ff14622a04148dbb9ccce6d9de5d534ea7Mailing ListPatch
- https://git.kernel.org/stable/c/69a02273e288011b521ee7c1f3ab2c23fda633ceMailing ListPatch
- https://git.kernel.org/stable/c/7a3bbe41efa55323b6ea3c35fa15941d4dbecdefMailing ListPatch
- https://git.kernel.org/stable/c/ab86cf6f8d24e63e9aca23da5108af1aa5483928Mailing ListPatch
- https://git.kernel.org/stable/c/bbaafbb4651fede8d3c3881601ecaa4f834f9d3fMailing ListPatch
- https://git.kernel.org/stable/c/ca09dfc3cfdf89e6af3ac24e1c6c0be5c575a729Mailing ListPatch
- https://git.kernel.org/stable/c/d679c816929d62af51c8e6d7fc0e165c9412d2f3Mailing ListPatch
- https://git.kernel.org/stable/c/1be3226445362bfbf461c92a5bcdb1723f2e4907Mailing ListPatch
- https://git.kernel.org/stable/c/52aaf1ff14622a04148dbb9ccce6d9de5d534ea7Mailing ListPatch
- https://git.kernel.org/stable/c/69a02273e288011b521ee7c1f3ab2c23fda633ceMailing ListPatch
- https://git.kernel.org/stable/c/7a3bbe41efa55323b6ea3c35fa15941d4dbecdefMailing ListPatch
- https://git.kernel.org/stable/c/ab86cf6f8d24e63e9aca23da5108af1aa5483928Mailing ListPatch
- https://git.kernel.org/stable/c/bbaafbb4651fede8d3c3881601ecaa4f834f9d3fMailing ListPatch
- https://git.kernel.org/stable/c/ca09dfc3cfdf89e6af3ac24e1c6c0be5c575a729Mailing ListPatch
FAQ
What is CVE-2024-26999?
CVE-2024-26999 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 b...
How severe is CVE-2024-26999?
CVE-2024-26999 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2024-26999?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Debian Debian Linux.