CVE-2026-68434 is a vulnerability in Linux Kernel
Published on August 12, 2026
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: 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.
Products Associated with CVE-2026-68434
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Affected Versions
Linux:- Version 587afb06a5d1dc5092d3d9e9ac3ccf22094d50c6 and below 1096397c31f6bffa95e77bdd18fbca085be83e10 is affected.
- Version 977855894bca4b87afa50d21e3f3e85a5a0e901f and below 600dcd548fb2b00a69f447684f52ba45d5a3540e is affected.
- Version 1cd54e217c6e2cdb794a897b2f855e13ffcee586 and below b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56 is affected.
- Version 9690e8a342632344984af72bc56b7a1fba61e6cb and below 8cbad52ccfa6a7f089cfab34979bc6cc3bff25be is affected.
- Version b1b4efea05a56c0995e4702a86d6624b4fdff32f and below 7fb13fd7e9a59a37cd911efff83abe19e3ee029d is affected.
- Version 763d61ded752fbb3116efc951eff4363f237b7e0 is affected.
- Version c7d190bb07bf4e3b217c69370e94d1b4c80a40ad is affected.
- Version 0b3ed3fa227ba778cabed96e7f8d84addb8bdf9c is affected.
- Version 6.6.145 and below 6.6.148 is affected.
- Version 6.12.96 and below 6.12.101 is affected.
- Version 6.18.39 and below 6.18.42 is affected.
- Version 7.1.4 and below 7.1.6 is affected.
- Version 5.10.261 and below 5.11 is affected.
- Version 5.15.212 and below 5.16 is affected.
- Version 6.1.178 and below 6.2 is affected.
- Version 7.2-rc3 is affected.
- Before 7.2-rc3 is unaffected.
- Version 6.6.148, <= 6.6.* is unaffected.
- Version 6.12.101, <= 6.12.* is unaffected.
- Version 6.18.42, <= 6.18.* is unaffected.
- Version 7.1.6, <= 7.1.* is unaffected.
- Version 7.2-rc5, <= * is unaffected.