CVE-2026-68434: serial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms
In the Linux kernel, the following vulnerability has been resolved:
serial: 8250mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms
Commit b1b4efea05a5 ("serial: 8250mid: Disable DMA for selected platforms") replaced the dnvboard setup and exit callbacks with PTRIF(false, ...), which evaluates to NULL. However, the three call sites in mid8250probe() and mid8250remove() unconditionally dereference these function pointers without NULL checks, causing a NULL pointer dereference (kernel oops) on any Denverton (DNV), Ice Lake Xeon D (ICX-D/CDF), or Snowridge (SNR) platform.
Fix this by adding the missing NULL checks before calling the setup and exit callbacks.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-68434?
CVE-2026-68434 has a risk score of 21, indicating a high-severity vulnerability.
How do I fix CVE-2026-68434?
To fix CVE-2026-68434, update the Linux kernel to the latest patched version provided by your distribution.
What systems are affected by CVE-2026-68434?
CVE-2026-68434 affects systems running specific DNV, ICX-D, and SNR platforms with the Linux kernel.
What type of vulnerability is CVE-2026-68434?
CVE-2026-68434 is a NULL function pointer dereference vulnerability in the Linux kernel.
Is CVE-2026-68434 being actively exploited?
There is no public information indicating active exploitation of CVE-2026-68434 at this time.