CVE-2022-49357

Status: AnalyzedMedium (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

efi: Do not import certificates from UEFI Secure Boot for T2 Macs

On Apple T2 Macs, when Linux attempts to read the db and dbx efi variables at early boot to load UEFI Secure Boot certificates, a page fault occurs in Apple firmware code and EFI runtime services are disabled with the following logs:

So we avoid reading these UEFI variables and thus prevent the crash.

Technical details traces, logs and code from the original report

[Firmware Bug]: Page fault caused by firmware at PA: 0xffffb1edc0068000
WARNING: CPU: 3 PID: 104 at arch/x86/platform/efi/quirks.c:735 efi_crash_gracefully_on_page_fault+0x50/0xf0
(Removed some logs from here)
Call Trace:
 <TASK>
 page_fault_oops+0x4f/0x2c0
 ? search_bpf_extables+0x6b/0x80
 ? search_module_extables+0x50/0x80
 ? search_exception_tables+0x5b/0x60
 kernelmode_fixup_or_oops+0x9e/0x110
 __bad_area_nosemaphore+0x155/0x190
 bad_area_nosemaphore+0x16/0x20
 do_kern_addr_fault+0x8c/0xa0
 exc_page_fault+0xd8/0x180
 asm_exc_page_fault+0x1e/0x30
(Removed some logs from here)
 ? __efi_call+0x28/0x30
 ? switch_mm+0x20/0x30
 ? efi_call_rts+0x19a/0x8e0
 ? process_one_work+0x222/0x3f0
 ? worker_thread+0x4a/0x3d0
 ? kthread+0x17a/0x1a0
 ? process_one_work+0x3f0/0x3f0
 ? set_kthread_struct+0x40/0x40
 ? ret_from_fork+0x22/0x30
 </TASK>
---[ end trace 1f82023595a5927f ]---
efi: Froze efi_rts_wq and disabled EFI Runtime Services
integrity: Couldn't get size: 0x8000000000000015
integrity: MODSIGN: Couldn't get UEFI db list
efi: EFI Runtime Services are disabled!
integrity: Couldn't get size: 0x8000000000000015
integrity: Couldn't get UEFI dbx list
integrity: Couldn't get size: 0x8000000000000015
integrity: Couldn't get mokx list
integrity: Couldn't get size: 0x80000000

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Base score: 5.5

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.17%
Percentile among all scored CVEs: 6
Score date: 10/5/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Linux — Linux Kernel

CWEs

NVD-CWE-noinfo

References

Raw JSON (NVD)

Show

{
  "id": "CVE-2022-49357",
  "cveTags": [],
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        "source": "nvd@nist.gov",
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          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
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          ],
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            {
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix",
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          ],
          "programFiles": [
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            "security/integrity/platform_certs/load_uefi.c"
          ],
          "defaultStatus": "affected"
        }
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  ],
  "published": "2025-02-26T07:01:12.390",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nefi: Do not import certificates from UEFI Secure Boot for T2 Macs\n\nOn Apple T2 Macs, when Linux attempts to read the db and dbx efi variables\nat early boot to load UEFI Secure Boot certificates, a page fault occurs\nin Apple firmware code and EFI runtime services are disabled with the\nfollowing logs:\n\n[Firmware Bug]: Page fault caused by firmware at PA: 0xffffb1edc0068000\nWARNING: CPU: 3 PID: 104 at arch/x86/platform/efi/quirks.c:735 efi_crash_gracefully_on_page_fault+0x50/0xf0\n(Removed some logs from here)\nCall Trace:\n <TASK>\n page_fault_oops+0x4f/0x2c0\n ? search_bpf_extables+0x6b/0x80\n ? search_module_extables+0x50/0x80\n ? search_exception_tables+0x5b/0x60\n kernelmode_fixup_or_oops+0x9e/0x110\n __bad_area_nosemaphore+0x155/0x190\n bad_area_nosemaphore+0x16/0x20\n do_kern_addr_fault+0x8c/0xa0\n exc_page_fault+0xd8/0x180\n asm_exc_page_fault+0x1e/0x30\n(Removed some logs from here)\n ? __efi_call+0x28/0x30\n ? switch_mm+0x20/0x30\n ? efi_call_rts+0x19a/0x8e0\n ? process_one_work+0x222/0x3f0\n ? worker_thread+0x4a/0x3d0\n ? kthread+0x17a/0x1a0\n ? process_one_work+0x3f0/0x3f0\n ? set_kthread_struct+0x40/0x40\n ? ret_from_fork+0x22/0x30\n </TASK>\n---[ end trace 1f82023595a5927f ]---\nefi: Froze efi_rts_wq and disabled EFI Runtime Services\nintegrity: Couldn't get size: 0x8000000000000015\nintegrity: MODSIGN: Couldn't get UEFI db list\nefi: EFI Runtime Services are disabled!\nintegrity: Couldn't get size: 0x8000000000000015\nintegrity: Couldn't get UEFI dbx list\nintegrity: Couldn't get size: 0x8000000000000015\nintegrity: Couldn't get mokx list\nintegrity: Couldn't get size: 0x80000000\n\nSo we avoid reading these UEFI variables and thus prevent the crash."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: efi: No importar certificados desde UEFI Secure Boot para Mac T2 En Mac T2 de Apple, cuando Linux intenta leer las variables efi db y dbx en el arranque temprano para cargar certificados UEFI Secure Boot, se produce un error de página en el código de firmware de Apple y los servicios de tiempo de ejecución de EFI se desactivan con los siguientes registros: [Error de firmware]: Error de página causado por el firmware en PA: 0xffffb1edc0068000 ADVERTENCIA: CPU: 3 PID: 104 at arch/x86/platform/efi/quirks.c:735 efi_crash_gracefully_on_page_fault+0x50/0xf0 (Removed some logs from here) Call Trace:  page_fault_oops+0x4f/0x2c0 ? search_bpf_extables+0x6b/0x80 ? search_module_extables+0x50/0x80 ? search_exception_tables+0x5b/0x60 kernelmode_fixup_or_oops+0x9e/0x110 __bad_area_nosemaphore+0x155/0x190 bad_area_nosemaphore+0x16/0x20 do_kern_addr_fault+0x8c/0xa0 exc_page_fault+0xd8/0x180 asm_exc_page_fault+0x1e/0x30 (Removed some logs from here) ? __efi_call+0x28/0x30 ? switch_mm+0x20/0x30 ? efi_call_rts+0x19a/0x8e0 ? process_one_work+0x222/0x3f0 ? worker_thread+0x4a/0x3d0 ? kthread+0x17a/0x1a0 ? process_one_work+0x3f0/0x3f0 ? set_kthread_struct+0x40/0x40 ? ret_from_fork+0x22/0x30  ---[ end trace 1f82023595a5927f ]--- efi: Froze efi_rts_wq and disabled EFI Runtime Services integrity: Couldn't get size: 0x8000000000000015 integrity: MODSIGN: Couldn't get UEFI db list efi: EFI Runtime Services are disabled! integrity: Couldn't get size: 0x8000000000000015 integrity: Couldn't get UEFI dbx list integrity: Couldn't get size: 0x8000000000000015 integrity: Couldn't get mokx list integrity: Couldn't get size: 0x80000000 De esta forma evitamos leer estas variables UEFI y, por lo tanto, evitamos el bloqueo."
    }
  ],
  "lastModified": "2026-06-17T05:17:48.860",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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}