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.
                
            Metrics
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                    Mon, 03 Nov 2025 23:30:00 +0000
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Thu, 26 Dec 2024 02:15:00 +0000
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| Weaknesses | CWE-119 | |
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Wed, 23 Oct 2024 17:00:00 +0000
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| Weaknesses | NVD-CWE-noinfo | |
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
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        Linux
         Linux linux Kernel  | 
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Mon, 21 Oct 2024 13:15:00 +0000
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Mon, 21 Oct 2024 12:30:00 +0000
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| Description | 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. | |
| Title | efistub/tpm: Use ACPI reclaim memory for event log to avoid corruption | |
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Status: PUBLISHED
Assigner: Linux
Published: 2024-10-21T12:27:17.308Z
Updated: 2025-11-03T22:22:27.038Z
Reserved: 2024-10-21T12:17:06.016Z
Link: CVE-2024-49858
Updated: 2025-11-03T22:22:27.038Z
Status : Modified
Published: 2024-10-21T13:15:06.543
Modified: 2025-11-03T23:16:26.000
Link: CVE-2024-49858