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Medium severity5.5NVD Advisory· Published May 6, 2026· Updated Jun 17, 2026

CVE-2026-43171

CVE-2026-43171

Description

In the Linux kernel, the following vulnerability has been resolved:

EFI/CPER: don't dump the entire memory region

The current logic at cper_print_fw_err() doesn't check if the error record length is big enough to handle offset. On a bad firmware, if the ofset is above the actual record, length -= offset will underflow, making it dump the entire memory.

The end result can be:

  • the logic taking a lot of time dumping large regions of memory;
  • data disclosure due to the memory dumps;
  • an OOPS, if it tries to dump an unmapped memory region.

Fix it by checking if the section length is too small before doing a hex dump.

[ rjw: Subject tweaks ]

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Affected products

18

Patches

Vulnerability mechanics

References

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