serial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68434
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-12 00:17:43 UTC
Updated2026-08-23 13:16:36 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001770000 probability, percentile 0.072760000 (date 2026-08-24)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 763d61ded752fbb3116efc951eff4363f237b7e0 bdaa8871b53fe9b1730ef64dda2fcd662fd83339 git Not specified
CNA Linux Linux affected c7d190bb07bf4e3b217c69370e94d1b4c80a40ad f85a42fb90399dedcf81c146d09c07e4548b1e8c git Not specified
CNA Linux Linux affected 0b3ed3fa227ba778cabed96e7f8d84addb8bdf9c 4ea933a36a14bec19b71025cdd8407bafbd67ec1 git Not specified
CNA Linux Linux affected 587afb06a5d1dc5092d3d9e9ac3ccf22094d50c6 1096397c31f6bffa95e77bdd18fbca085be83e10 git Not specified
CNA Linux Linux affected 977855894bca4b87afa50d21e3f3e85a5a0e901f 600dcd548fb2b00a69f447684f52ba45d5a3540e git Not specified
CNA Linux Linux affected 1cd54e217c6e2cdb794a897b2f855e13ffcee586 b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56 git Not specified
CNA Linux Linux affected 9690e8a342632344984af72bc56b7a1fba61e6cb 8cbad52ccfa6a7f089cfab34979bc6cc3bff25be git Not specified
CNA Linux Linux affected b1b4efea05a56c0995e4702a86d6624b4fdff32f 7fb13fd7e9a59a37cd911efff83abe19e3ee029d git Not specified
CNA Linux Linux affected 5.10.261 5.10.266 semver Not specified
CNA Linux Linux affected 5.15.212 5.15.217 semver Not specified
CNA Linux Linux affected 6.1.178 6.1.183 semver Not specified
CNA Linux Linux affected 6.6.145 6.6.148 semver Not specified
CNA Linux Linux affected 6.12.96 6.12.101 semver Not specified
CNA Linux Linux affected 6.18.39 6.18.42 semver Not specified
CNA Linux Linux affected 7.1.4 7.1.6 semver Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/bdaa8871b53fe9b1730ef64dda2fcd662fd83339 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/600dcd548fb2b00a69f447684f52ba45d5a3540e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1096397c31f6bffa95e77bdd18fbca085be83e10 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f85a42fb90399dedcf81c146d09c07e4548b1e8c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7fb13fd7e9a59a37cd911efff83abe19e3ee029d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4ea933a36a14bec19b71025cdd8407bafbd67ec1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8cbad52ccfa6a7f089cfab34979bc6cc3bff25be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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