CVE-2026-68434

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

State: Published
Severity: Not scored
Published: Aug 12, 2026
Updated: Aug 23, 2026
Reserved: Jul 30, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	763d61ded752fbb3116efc951eff4363f237b7e0 to before bdaa8871b53fe9b1730ef64dda2fcd662fd83339Affected c7d190bb07bf4e3b217c69370e94d1b4c80a40ad to before f85a42fb90399dedcf81c146d09c07e4548b1e8cAffected 0b3ed3fa227ba778cabed96e7f8d84addb8bdf9c to before 4ea933a36a14bec19b71025cdd8407bafbd67ec1Affected 587afb06a5d1dc5092d3d9e9ac3ccf22094d50c6 to before 1096397c31f6bffa95e77bdd18fbca085be83e10Affected 977855894bca4b87afa50d21e3f3e85a5a0e901f to before 600dcd548fb2b00a69f447684f52ba45d5a3540eAffected 1cd54e217c6e2cdb794a897b2f855e13ffcee586 to before b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56Affected 9690e8a342632344984af72bc56b7a1fba61e6cb to before 8cbad52ccfa6a7f089cfab34979bc6cc3bff25beAffected b1b4efea05a56c0995e4702a86d6624b4fdff32f to before 7fb13fd7e9a59a37cd911efff83abe19e3ee029dAffected
LinuxLinux	5.10.261 to before 5.10.266Affected 5.15.212 to before 5.15.217Affected 6.1.178 to before 6.1.183Affected 6.6.145 to before 6.6.148Affected 6.12.96 to before 6.12.101Affected 6.18.39 to before 6.18.42Affected 7.1.4 to before 7.1.6Affected

Product

Versions

LinuxLinux

763d61ded752fbb3116efc951eff4363f237b7e0 to before bdaa8871b53fe9b1730ef64dda2fcd662fd83339Affected
c7d190bb07bf4e3b217c69370e94d1b4c80a40ad to before f85a42fb90399dedcf81c146d09c07e4548b1e8cAffected
0b3ed3fa227ba778cabed96e7f8d84addb8bdf9c to before 4ea933a36a14bec19b71025cdd8407bafbd67ec1Affected
587afb06a5d1dc5092d3d9e9ac3ccf22094d50c6 to before 1096397c31f6bffa95e77bdd18fbca085be83e10Affected
977855894bca4b87afa50d21e3f3e85a5a0e901f to before 600dcd548fb2b00a69f447684f52ba45d5a3540eAffected
1cd54e217c6e2cdb794a897b2f855e13ffcee586 to before b2a3eeb57ba24f8a0e34a69d40adcc63e5b9ca56Affected
9690e8a342632344984af72bc56b7a1fba61e6cb to before 8cbad52ccfa6a7f089cfab34979bc6cc3bff25beAffected
b1b4efea05a56c0995e4702a86d6624b4fdff32f to before 7fb13fd7e9a59a37cd911efff83abe19e3ee029dAffected

LinuxLinux

5.10.261 to before 5.10.266Affected
5.15.212 to before 5.15.217Affected
6.1.178 to before 6.1.183Affected
6.6.145 to before 6.6.148Affected
6.12.96 to before 6.12.101Affected
6.18.39 to before 6.18.42Affected
7.1.4 to before 7.1.6Affected

References

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