CVE-2026-68434
In the Linux kernel, the following vulnerability has been resolved: serial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms Commit b1b4efea05a5 ("serial: 8250_mid: Disable DMA for selected platforms") replaced the dnv_board setup and exit callbacks with PTR_IF(false, ...), which evaluates to NULL. However, the three call sites in mid8250_probe() and mid8250_remove() 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 versions
Linux kernel versions
6.6.145,
6.12.96,
6.18.39,
7.1.4,
5.10.261,
5.15.212,
6.1.178,
7.2-rc3
and later are affected. Fixed in
6.6.148,
6.12.101,
6.18.42,
7.1.6,
7.2-rc5
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-68434?
CVE-2026-68434 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.6.145 onward and has been patched in 6.6.148, 6.12.101, 6.18.42 and others. CVE-2026-68434 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-68434?
Yes. CVE-2026-68434 has been patched. Fixed versions include 6.6.148, 6.12.101, 6.18.42 and others. If you are running Linux kernel 6.6.145 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-68434 actively exploited?
No. CVE-2026-68434 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.