CVE-2026-43240

Summary

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

x86/kexec: add a sanity check on previous kernel's ima kexec buffer

When the second-stage kernel is booted via kexec with a limiting command line such as "mem=<size>", the physical range that contains the carried over IMA measurement list may fall outside the truncated RAM leading to a kernel panic.

BUG: unable to handle page fault for address: ffff97793ff47000
RIP: ima_restore_measurement_list+0xdc/0x45a
#PF: error_code(0x0000) – not-present page

Other architectures already validate the range with page_is_ram(), as done in commit cbf9c4b9617b ("of: check previous kernel's ima-kexec-buffer against memory bounds") do a similar check on x86.

Without carrying the measurement list across kexec, the attestation would fail.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/37f18915a261afe84dab462624ed829cddb77a9b
• https://git.kernel.org/stable/c/22e460b6333a5f818b042ac89201f8e735556f4a
• https://git.kernel.org/stable/c/7e2476057950c174c7b2c2802246707bbfb497e4
• https://git.kernel.org/stable/c/f8f73bf0f8a57ee9b86792456bd42079bc98c6b7
• https://git.kernel.org/stable/c/d4a132f121c591b60dbaf57ea91f1faf11631fbc
• https://git.kernel.org/stable/c/4d7a8f5f28187e3d2958b2a134473da2665207e7
• https://git.kernel.org/stable/c/c5489d04337b47e93c0623e8145fcba3f5739efd

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