CVE-2026-43129 (GCVE-0-2026-43129)
Vulnerability from cvelistv5
Published
2026-05-06 11:27
Modified
2026-06-19 11:58
Severity ?
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().
References
Impacted products
Vendor Product Version
Linux Linux Version: b69a2afd5afce9bf6d56e349d6ab592c916e20f2
Version: b69a2afd5afce9bf6d56e349d6ab592c916e20f2
Version: b69a2afd5afce9bf6d56e349d6ab592c916e20f2
Version: b69a2afd5afce9bf6d56e349d6ab592c916e20f2
Version: b69a2afd5afce9bf6d56e349d6ab592c916e20f2
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{
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          "programFiles": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nima: verify the previous kernel\u0027s 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=\u003csize\u003e\" 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\u0027s 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=\u003csize\u003e\"), 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()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-19T11:58:16.640Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/43308106a1762b72f3b20a44b75b2df5cb25b77b"
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          "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"
        }
      ],
      "title": "ima: verify the previous kernel\u0027s IMA buffer lies in addressable RAM",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43129",
    "datePublished": "2026-05-06T11:27:18.180Z",
    "dateReserved": "2026-05-01T14:12:55.988Z",
    "dateUpdated": "2026-06-19T11:58:16.640Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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