Description

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

serial: 8250_port: Check IRQ data before use

In case the leaf driver wants to use IRQ polling (irq = 0) and
IIR register shows that an interrupt happened in the 8250 hardware
the IRQ data can be NULL. In such a case we need to skip the wake
event as we came to this path from the timer interrupt and quite
likely system is already awake.

Without this fix we have got an Oops:

serial8250: ttyS0 at I/O 0x3f8 (irq = 0, base_baud = 115200) is a 16550A
...
BUG: kernel NULL pointer dereference, address: 0000000000000010
RIP: 0010:serial8250_handle_irq+0x7c/0x240
Call Trace:
? serial8250_handle_irq+0x7c/0x240
? __pfx_serial8250_timeout+0x10/0x10

Classification

CVE ID: CVE-2023-52567

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 5.08% (scored less or equal to compared to others)

EPSS Date: 2025-02-04 (when was this score calculated)

References

https://git.kernel.org/stable/c/ee5732caaffba3a37e753fdb89b4958db9a61847
https://git.kernel.org/stable/c/c334650150c29234b0923476f51573ae1b2f252a
https://git.kernel.org/stable/c/bf3c728e3692cc6d998874f0f27d433117348742
https://git.kernel.org/stable/c/e14afa4450cb7e4cf93e993a765801203d41d014
https://git.kernel.org/stable/c/2b837f13a818f96304736453ac53b66a70aaa4f2
https://git.kernel.org/stable/c/e14f68a48fd445a083ac0750fafcb064df5f18f7
https://git.kernel.org/stable/c/3345cc5f02f1fb4c4dcb114706f2210d879ab933
https://git.kernel.org/stable/c/cce7fc8b29961b64fadb1ce398dc5ff32a79643b

Timeline