CVE-2026-43129 (GCVE-0-2026-43129)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:27 – Updated: 2026-06-19 11:58
VLAI
Title
ima: verify the previous kernel's IMA buffer lies in addressable RAM
Summary
In the Linux kernel, the following vulnerability has been resolved: ima: verify the previous kernel's IMA buffer lies in addressable RAM Patch series "Address page fault in ima_restore_measurement_list()", v3. When the second-stage kernel is booted via kexec with a limiting command line such as "mem=<size>" we observe a pafe fault that happens. BUG: unable to handle page fault for address: ffff97793ff47000 RIP: ima_restore_measurement_list+0xdc/0x45a #PF: error_code(0x0000) not-present page This happens on x86_64 only, as this is already fixed in aarch64 in commit: cbf9c4b9617b ("of: check previous kernel's ima-kexec-buffer against memory bounds") This patch (of 3): When the second-stage kernel is booted with a limiting command line (e.g. "mem=<size>"), the IMA measurement buffer handed over from the previous kernel may fall outside the addressable RAM of the new kernel. Accessing such a buffer can fault during early restore. Introduce a small generic helper, ima_validate_range(), which verifies that a physical [start, end] range for the previous-kernel IMA buffer lies within addressable memory: - On x86, use pfn_range_is_mapped(). - On OF based architectures, use page_is_ram().
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b69a2afd5afce9bf6d56e349d6ab592c916e20f2 , < 43308106a1762b72f3b20a44b75b2df5cb25b77b (git)
Affected: b69a2afd5afce9bf6d56e349d6ab592c916e20f2 , < f11d7d088f5ed54b31c6735854c12845eb60eb4a (git)
Affected: b69a2afd5afce9bf6d56e349d6ab592c916e20f2 , < 9e1f51c1ad57cc76a0e8b5eb27038f8973fff4fa (git)
Affected: b69a2afd5afce9bf6d56e349d6ab592c916e20f2 , < 5366ec7d2f793ce703c403d7fd4c25a3db365b9d (git)
Affected: b69a2afd5afce9bf6d56e349d6ab592c916e20f2 , < 10d1c75ed4382a8e79874379caa2ead8952734f9 (git)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.77 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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}



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