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CVE-2026-68434

Unknown

Last modified

CVE-2026-68434 is a vulnerability of currently unknown severity. 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..

Description

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 Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 587afb06a5d1dc5092d3d9e9ac3ccf22094d50c6, < 1096397c31f6bffa95e77bdd18fbca085be83e10; >= 977855894bca4b87afa50d21e3f3e85a5a0e901f, < 600dcd548fb2b00a69f447684f52ba45d5a3540e; >= 1cd54e217c6e2cdb794a897b2f855e13ffcee586, < b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56; >= 9690e8a342632344984af72bc56b7a1fba61e6cb, < 8cbad52ccfa6a7f089cfab34979bc6cc3bff25be; >= b1b4efea05a56c0995e4702a86d6624b4fdff32f, < 7fb13fd7e9a59a37cd911efff83abe19e3ee029d; 763d61ded752fbb3116efc951eff4363f237b7e0; c7d190bb07bf4e3b217c69370e94d1b4c80a40ad; 0b3ed3fa227ba778cabed96e7f8d84addb8bdf9c; >= 6.6.145, < 6.6.148; >= 6.12.96, < 6.12.101; >= 6.18.39, < 6.18.42; >= 7.1.4, < 7.1.6; >= 5.10.261, < 5.11; >= 5.15.212, < 5.16; >= 6.1.178, < 6.2
LinuxLinux7.2-rc3

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is 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.
How severe is CVE-2026-68434?
Severity scoring for CVE-2026-68434 is pending analysis.
How do I fix CVE-2026-68434?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST