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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/1096397c31f6bffa95e77bdd18fbca085be83e10 cve-icon cve-icon
https://git.kernel.org/stable/c/4ea933a36a14bec19b71025cdd8407bafbd67ec1 cve-icon cve-icon
https://git.kernel.org/stable/c/600dcd548fb2b00a69f447684f52ba45d5a3540e cve-icon cve-icon
https://git.kernel.org/stable/c/7fb13fd7e9a59a37cd911efff83abe19e3ee029d cve-icon cve-icon
https://git.kernel.org/stable/c/8cbad52ccfa6a7f089cfab34979bc6cc3bff25be cve-icon cve-icon
https://git.kernel.org/stable/c/b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56 cve-icon cve-icon
https://git.kernel.org/stable/c/bdaa8871b53fe9b1730ef64dda2fcd662fd83339 cve-icon cve-icon
https://git.kernel.org/stable/c/f85a42fb90399dedcf81c146d09c07e4548b1e8c cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2026081255-CVE-2026-68434-b1c1@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-68434 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-68434 cve-icon
History

Sun, 23 Aug 2026 13:15:00 +0000

Type Values Removed Values Added
References

Wed, 19 Aug 2026 16:45:00 +0000

Type Values Removed Values Added
References

Thu, 13 Aug 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Low

Wed, 12 Aug 2026 16:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-476

Wed, 12 Aug 2026 00:15:00 +0000

Type Values Removed Values Added
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.
Title serial: 8250_mid: Fix NULL function pointer dereference on DNV/ICX-D/SNR platforms
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-08-12T00:07:21.897Z

Updated: 2026-08-23T12:46:23.299Z

Reserved: 2026-07-30T09:28:09.393Z

Link: CVE-2026-68434

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-12T00:17:43.520

Modified: 2026-08-23T13:16:36.980

Link: CVE-2026-68434

cve-icon Redhat

Severity : Low

Publid Date: 2026-08-12T00:00:00Z

Links: CVE-2026-68434 - Bugzilla