CVE-2026-43171

Summary

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 ]

Affected Software

VendorProductVersion RangeStatus
LinuxLinux3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 < 02de64ab54b4bb0f1b21bb324aeff3b08612be33affected
LinuxLinux3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 < 0e09b522f2622841389c3b2f9ac4969e35c0809daffected
LinuxLinux3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 < 64ae5aaa7ac93c83da456039e8ec747bfa8a7cffaffected
LinuxLinux3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 < 5a9b1dda8481b82851a655c3bcc5b44879b95334affected
LinuxLinux3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 < 7780c0bad2a3a70a8c0113a33c02f4151d901eb3affected
LinuxLinux3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 < a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91affected
LinuxLinux3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 < 54e131db4cdffd946db890ff33ff2647053fd4f6affected
LinuxLinux3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 < 55cc6fe5716f678f06bcb95140882dfa684464ecaffected
LinuxLinux5.7affected
LinuxLinux0 < 5.7unaffected
LinuxLinux5.10.252 <= 5.10.*unaffected
LinuxLinux5.15.202 <= 5.15.*unaffected
LinuxLinux6.1.165 <= 6.1.*unaffected
LinuxLinux6.6.128 <= 6.6.*unaffected
LinuxLinux6.12.75 <= 6.12.*unaffected
LinuxLinux6.18.16 <= 6.18.*unaffected
LinuxLinux6.19.6 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References