CVE-2026-43240
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
A vulnerability has been identified and resolved in the Linux kernel. The issue occurs when the second-stage kernel is booted via kexec with limiting parameters, potentially leading to a kernel panic due to memory range errors.
Risk Assessment
The lack of memory range validation may lead to system crashes, affecting service availability. Additionally, failing to carry over the IMA measurement list could result in attestation failures.
Recommendation
It is recommended to update the Linux kernel to the latest version to benefit from the introduced fix. Also, monitor kexec configurations to ensure compliance with the new security measures.
Original NVD description (English source)
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.