CVE-2024-26678 (GCVE-0-2024-26678)
Vulnerability from cvelistv5
Published
2024-04-02 07:01
Modified
2025-05-04 08:53
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/efistub: Use 1:1 file:memory mapping for PE/COFF .compat section The .compat section is a dummy PE section that contains the address of the 32-bit entrypoint of the 64-bit kernel image if it is bootable from 32-bit firmware (i.e., CONFIG_EFI_MIXED=y) This section is only 8 bytes in size and is only referenced from the loader, and so it is placed at the end of the memory view of the image, to avoid the need for padding it to 4k, which is required for sections appearing in the middle of the image. Unfortunately, this violates the PE/COFF spec, and even if most EFI loaders will work correctly (including the Tianocore reference implementation), PE loaders do exist that reject such images, on the basis that both the file and memory views of the file contents should be described by the section headers in a monotonically increasing manner without leaving any gaps. So reorganize the sections to avoid this issue. This results in a slight padding overhead (< 4k) which can be avoided if desired by disabling CONFIG_EFI_MIXED (which is only needed in rare cases these days)
References
Impacted products
Vendor Product Version
Linux Linux Version: c4421279b6c278efe129bde7abc64af59ea2dfbd
Version: 686b58ce5052842bd34ea94870a2671317331716
Version: 3e3eabe26dc88692d34cf76ca0e0dd331481cc15
Version: 3e3eabe26dc88692d34cf76ca0e0dd331481cc15
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