Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.0, < 6.1.165 |
References
- https://git.kernel.org/stable/c/22e460b6333a5f818b042ac89201f8e735556f4aPatch
- https://git.kernel.org/stable/c/37f18915a261afe84dab462624ed829cddb77a9bPatch
- https://git.kernel.org/stable/c/4d7a8f5f28187e3d2958b2a134473da2665207e7Patch
- https://git.kernel.org/stable/c/c5489d04337b47e93c0623e8145fcba3f5739efdPatch
- https://git.kernel.org/stable/c/d4a132f121c591b60dbaf57ea91f1faf11631fbcPatch
- https://git.kernel.org/stable/c/f8f73bf0f8a57ee9b86792456bd42079bc98c6b7Patch
FAQ
What is CVE-2026-43240?
CVE-2026-43240 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 limiti...
How severe is CVE-2026-43240?
CVE-2026-43240 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-43240?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.