{"id":"CVE-2026-43129","title":"ima: verify the previous kernel's IMA buffer lies in addressable RAM","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nima: verify the previous kernel's IMA buffer lies in addressable RAM\n\nPatch series \"Address page fault in ima_restore_measurement_list()\", v3.\n\nWhen the second-stage ke…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 5bfa1941ec40d5bed68f3e3f22ea13aff9c6d67a","Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 43308106a1762b72f3b20a44b75b2df5cb25b77b","Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < f11d7d088f5ed54b31c6735854c12845eb60eb4a","Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 9e1f51c1ad57cc76a0e8b5eb27038f8973fff4fa","Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 5366ec7d2f793ce703c403d7fd4c25a3db365b9d","Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 10d1c75ed4382a8e79874379caa2ead8952734f9","Linux 6.0"],"published":"2026-05-06","updated":"2026-10-30","sourceUpdated":"2026-10-30T12:25:03.802Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43129","references":[{"url":"https://git.kernel.org/stable/c/5bfa1941ec40d5bed68f3e3f22ea13aff9c6d67a"},{"url":"https://git.kernel.org/stable/c/43308106a1762b72f3b20a44b75b2df5cb25b77b"},{"url":"https://git.kernel.org/stable/c/f11d7d088f5ed54b31c6735854c12845eb60eb4a"},{"url":"https://git.kernel.org/stable/c/9e1f51c1ad57cc76a0e8b5eb27038f8973fff4fa"},{"url":"https://git.kernel.org/stable/c/5366ec7d2f793ce703c403d7fd4c25a3db365b9d"},{"url":"https://git.kernel.org/stable/c/10d1c75ed4382a8e79874379caa2ead8952734f9"}],"tags":["cve.org"],"epss":0.00123,"epssPercentile":0.02049,"ingestedAt":"2026-11-05T15:02:32.275Z","slug":"CVE-2026-43129","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nima: verify the previous kernel's IMA buffer lies in addressable RAM\n\nPatch series \"Address page fault in ima_restore_measurement_list()\", v3.\n\nWhen the second-stage kernel is booted via kexec with a limiting command\nline such as \"mem=<size>\" we observe a pafe fault that happens.\n\n    BUG: unable to handle page fault for address: ffff97793ff47000\n    RIP: ima_restore_measurement_list+0xdc/0x45a\n    #PF: error_code(0x0000)  not-present page\n\nThis happens on x86_64 only, as this is already fixed in aarch64 in\ncommit: cbf9c4b9617b (\"of: check previous kernel's ima-kexec-buffer\nagainst memory bounds\")\n\n\nThis patch (of 3):\n\nWhen the second-stage kernel is booted with a limiting command line (e.g. \n\"mem=<size>\"), the IMA measurement buffer handed over from the previous\nkernel may fall outside the addressable RAM of the new kernel.  Accessing\nsuch a buffer can fault during early restore.\n\nIntroduce a small generic helper, ima_validate_range(), which verifies\nthat a physical [start, end] range for the previous-kernel IMA buffer lies\nwithin addressable memory:\n\t- On x86, use pfn_range_is_mapped().\n\t- On OF based architectures, use page_is_ram().\n\n## Affected\n\n- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 5bfa1941ec40d5bed68f3e3f22ea13aff9c6d67a`\n- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 43308106a1762b72f3b20a44b75b2df5cb25b77b`\n- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < f11d7d088f5ed54b31c6735854c12845eb60eb4a`\n- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 9e1f51c1ad57cc76a0e8b5eb27038f8973fff4fa`\n- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 5366ec7d2f793ce703c403d7fd4c25a3db365b9d`\n- `Linux >= b69a2afd5afce9bf6d56e349d6ab592c916e20f2 < 10d1c75ed4382a8e79874379caa2ead8952734f9`\n- `Linux 6.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}