CVE-2026-68434
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| 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) Other versions: unaffected |
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) Other versions: unaffected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/bdaa8871b53fe9b1730ef64dda2fcd662fd83339CNA: Linux
- https://git.kernel.org/stable/c/f85a42fb90399dedcf81c146d09c07e4548b1e8cCNA: Linux
- https://git.kernel.org/stable/c/4ea933a36a14bec19b71025cdd8407bafbd67ec1CNA: Linux
- https://git.kernel.org/stable/c/1096397c31f6bffa95e77bdd18fbca085be83e10CNA: Linux
- https://git.kernel.org/stable/c/600dcd548fb2b00a69f447684f52ba45d5a3540eCNA: Linux
- https://git.kernel.org/stable/c/b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56CNA: Linux
- https://git.kernel.org/stable/c/8cbad52ccfa6a7f089cfab34979bc6cc3bff25beCNA: Linux
- https://git.kernel.org/stable/c/7fb13fd7e9a59a37cd911efff83abe19e3ee029dCNA: Linux
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