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

Status: published. Published: 2026-08-12. Updated: 2026-11-06.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 763d61ded752fbb3116efc951eff4363f237b7e0; < bdaa8871b53fe9b1730ef64dda2fcd662fd83339 (affected, git); ≥ c7d190bb07bf4e3b217c69370e94d1b4c80a40ad; < f85a42fb90399dedcf81c146d09c07e4548b1e8c (affected, git); ≥ 0b3ed3fa227ba778cabed96e7f8d84addb8bdf9c; < 4ea933a36a14bec19b71025cdd8407bafbd67ec1 (affected, git); ≥ 587afb06a5d1dc5092d3d9e9ac3ccf22094d50c6; < 1096397c31f6bffa95e77bdd18fbca085be83e10 (affected, git); ≥ 977855894bca4b87afa50d21e3f3e85a5a0e901f; < 600dcd548fb2b00a69f447684f52ba45d5a3540e (affected, git); ≥ 1cd54e217c6e2cdb794a897b2f855e13ffcee586; < b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56 (affected, git); ≥ 9690e8a342632344984af72bc56b7a1fba61e6cb; < 8cbad52ccfa6a7f089cfab34979bc6cc3bff25be (affected, git); ≥ b1b4efea05a56c0995e4702a86d6624b4fdff32f; < 7fb13fd7e9a59a37cd911efff83abe19e3ee029d (affected, git). Source: CNA: Linux
- Linux / Linux: ≥ 5.10.261; < 5.10.266 (affected, semver); ≥ 5.15.212; < 5.15.217 (affected, semver); ≥ 6.1.178; < 6.1.183 (affected, semver); ≥ 6.6.145; < 6.6.148 (affected, semver); ≥ 6.12.96; < 6.12.101 (affected, semver); ≥ 6.18.39; < 6.18.42 (affected, semver); ≥ 7.1.4; < 7.1.6 (affected, semver). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.18% as of 2026-11-06; percentile 7.34%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/bdaa8871b53fe9b1730ef64dda2fcd662fd83339 (CNA: Linux)

- https://git.kernel.org/stable/c/f85a42fb90399dedcf81c146d09c07e4548b1e8c (CNA: Linux)

- https://git.kernel.org/stable/c/4ea933a36a14bec19b71025cdd8407bafbd67ec1 (CNA: Linux)

- https://git.kernel.org/stable/c/1096397c31f6bffa95e77bdd18fbca085be83e10 (CNA: Linux)

- https://git.kernel.org/stable/c/600dcd548fb2b00a69f447684f52ba45d5a3540e (CNA: Linux)

- https://git.kernel.org/stable/c/b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56 (CNA: Linux)

- https://git.kernel.org/stable/c/8cbad52ccfa6a7f089cfab34979bc6cc3bff25be (CNA: Linux)

- https://git.kernel.org/stable/c/7fb13fd7e9a59a37cd911efff83abe19e3ee029d (CNA: Linux)

- https://git.kernel.org/stable/c/1096397c31f6bffa95e77bdd18fbca085be83e10 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/4ea933a36a14bec19b71025cdd8407bafbd67ec1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/600dcd548fb2b00a69f447684f52ba45d5a3540e (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/7fb13fd7e9a59a37cd911efff83abe19e3ee029d (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/8cbad52ccfa6a7f089cfab34979bc6cc3bff25be (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/bdaa8871b53fe9b1730ef64dda2fcd662fd83339 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/f85a42fb90399dedcf81c146d09c07e4548b1e8c (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-68434; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-68434; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-68434; retrieved 2026-11-06; source updated Not reported

Revision: ea96e750375a64540df6edb54d63e825c1984e6eab348c9cd63d40042dab8b10

Canonical: https://y2.dev/cve/CVE-2026-68434

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