CVE-2023-52567: serial: 8250_port: Check IRQ data before use

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-02 · updated 2026-06-17
Weakness: CWE-476

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

Affected products

Linux kernel: from 4.14.315 before 4.14.327; from 4.19.283 before 4.19.296; from 5.4.243 before 5.4.258; from 5.10.180 before 5.10.198; from 5.15.111 before 5.15.134; from 6.1.28 before 6.1.56 — fixed in 4.14.327, 4.19.296, 5.10.198, 5.15.134, 5.4.258, 6.1.56

How to fix

Upgrade to a fixed version: Linux kernel 4.14.327, 4.19.296, 5.10.198, 5.15.134. Check the vendor advisory for mitigations.

References

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