CVE-2024-26678
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…
Does this matter?
Lower severity and a low EPSS score (0.22%). Track it; it rarely justifies an emergency change on its own.
Description
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)
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.22% probability · 13th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0a962f2fbaa976af9eed21d0306370cded485787Patch
- https://git.kernel.org/stable/c/1ad55cecf22f05f1c884adf63cc09d3c3e609ebfPatch
- https://git.kernel.org/stable/c/4adeeff8c12321cd453412a659c3c0eeb9bb2397Patch
- https://git.kernel.org/stable/c/d327e961573fc335af0ae8a160302205327e1f4ePatch
- https://git.kernel.org/stable/c/0a962f2fbaa976af9eed21d0306370cded485787Patch
- https://git.kernel.org/stable/c/1ad55cecf22f05f1c884adf63cc09d3c3e609ebfPatch
- https://git.kernel.org/stable/c/4adeeff8c12321cd453412a659c3c0eeb9bb2397Patch
- https://git.kernel.org/stable/c/d327e961573fc335af0ae8a160302205327e1f4ePatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.