medium
5.5
Advisory Published
Updated

CVE-2024-49858: efistub/tpm: Use ACPI reclaim memory for event log to avoid corruption

First published: Mon Oct 21 2024(Updated: )

In the Linux kernel, the following vulnerability has been resolved: efistub/tpm: Use ACPI reclaim memory for event log to avoid corruption The TPM event log table is a Linux specific construct, where the data produced by the GetEventLog() boot service is cached in memory, and passed on to the OS using an EFI configuration table. The use of EFI_LOADER_DATA here results in the region being left unreserved in the E820 memory map constructed by the EFI stub, and this is the memory description that is passed on to the incoming kernel by kexec, which is therefore unaware that the region should be reserved. Even though the utility of the TPM2 event log after a kexec is questionable, any corruption might send the parsing code off into the weeds and crash the kernel. So let's use EFI_ACPI_RECLAIM_MEMORY instead, which is always treated as reserved by the E820 conversion logic.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Affected SoftwareAffected VersionHow to fix
Linux Kernel<5.10.227
Linux Kernel>=5.11<5.15.168
Linux Kernel>=5.16<6.1.113
Linux Kernel>=6.2<6.6.54
Linux Kernel>=6.7<6.10.13
Linux Kernel>=6.11<6.11.2
debian/linux<=5.10.223-1<=5.10.226-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.15-1
debian/linux-6.1
6.1.119-1~deb11u1

Remedy

https://git.kernel.org/stable/c/11690d7e76842f29b60fbb5b35bc97d206ea0e83

Remedy

https://git.kernel.org/stable/c/19fd2f2c5fb36b61506d3208474bfd8fdf1cada3

Remedy

https://git.kernel.org/stable/c/2e6871a632a99d9b9e2ce3a7847acabe99e5a26e

Remedy

https://git.kernel.org/stable/c/38d9b07d99b789efb6d8dda21f1aaad636c38993

Remedy

https://git.kernel.org/stable/c/5b22c038fb2757c652642933de5664da471f8cb7

Remedy

https://git.kernel.org/stable/c/77d48d39e99170b528e4f2e9fc5d1d64cdedd386

Remedy

https://git.kernel.org/stable/c/f76b69ab9cf04358266e3cea5748c0c2791fbb08

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2024-49858?

    CVE-2024-49858 is classified as a moderate severity vulnerability in the Linux kernel.

  • How does CVE-2024-49858 affect the Linux kernel?

    CVE-2024-49858 affects the TPM event log handling, risking event log corruption if not addressed.

  • How do I fix CVE-2024-49858?

    To fix CVE-2024-49858, upgrade to Linux kernel versions 6.1.123-1, 6.12.12-1, or later versions that contain the patch.

  • Which Linux kernel versions are vulnerable to CVE-2024-49858?

    Linux kernel versions before 5.10.227, between 5.11 and 5.15.168, and other specified ranges leading up to 6.11.2 are vulnerable to CVE-2024-49858.

  • What are the potential risks of not addressing CVE-2024-49858?

    Not addressing CVE-2024-49858 can lead to corruption of the TPM event logs, which may affect system integrity and security.

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