CVE-2026-43266

Summary

In the Linux kernel, the following vulnerability has been resolved:

EFI/CPER: don't go past the ARM processor CPER record buffer

There's a logic inside GHES/CPER to detect if the section_length is too small, but it doesn't detect if it is too big.

Currently, if the firmware receives an ARM processor CPER record stating that a section length is big, kernel will blindly trust section_length, producing a very long dump. For instance, a 67 bytes record with ERR_INFO_NUM set 46198 and section length set to 854918320 would dump a lot of data going a way past the firmware memory-mapped area.

Fix it by adding a logic to prevent it to go past the buffer if ERR_INFO_NUM is too big, making it report instead:

[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 1
[Hardware Error]: event severity: recoverable
[Hardware Error]:  Error 0, type: recoverable
[Hardware Error]:   section_type: ARM processor error
[Hardware Error]:   MIDR: 0xff304b2f8476870a
[Hardware Error]:   section length: 854918320, CPER size: 67
[Hardware Error]:   section length is too big
[Hardware Error]:   firmware-generated error record is incorrect
[Hardware Error]:   ERR_INFO_NUM is 46198

[ rjw: Subject and changelog tweaks ]

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/c80113dcfc807308f5ab33847fae77e07531aeb8
• https://git.kernel.org/stable/c/ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4
• https://git.kernel.org/stable/c/a68d22902a6916e10ee235fee609239004e129d0
• https://git.kernel.org/stable/c/64eb63f573f497553e1a0c388bbcdd639e0f0704
• https://git.kernel.org/stable/c/be10c1bdf64a39832998f54900aa309b3917abcf
• https://git.kernel.org/stable/c/25b290624b0e3d2f0f90238709ee0b6009b9fde8
• https://git.kernel.org/stable/c/45766863baf899059e75595dd3cb1116467f2095
• https://git.kernel.org/stable/c/eae21beecb95a3b69ee5c38a659f774e171d730e

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