CVE-2025-22047 (GCVE-0-2025-22047)
Vulnerability from cvelistv5
Published
2025-04-16 14:12
Modified
2026-08-05 11:56
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/microcode/AMD: Fix __apply_microcode_amd()'s return value When verify_sha256_digest() fails, __apply_microcode_amd() should propagate the failure by returning false (and not -1 which is promoted to true).
References
Impacted products
Vendor Product Version
Linux Linux Version: bef830144febedb7de86863ae99d8f53bed76e95
Version: 3e8653e399e7111a3e87d534ff4533b250ae574f
Version: c162ba4f45ab6ef3b7114af6fb419f1833f050c0
Version: 50cef76d5cb0e199cda19f026842560f6eedc4f7
Version: 50cef76d5cb0e199cda19f026842560f6eedc4f7
Version: 6.6.81   ≤
Version: 6.12.18   ≤
Version: 6.13.6   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kernel/cpu/microcode/amd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kernel/cpu/microcode/amd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
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              "status": "unaffected",
              "version": "0",
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.23",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.13.*",
              "status": "unaffected",
              "version": "6.13.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.87",
                  "versionStartIncluding": "6.6.81",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.23",
                  "versionStartIncluding": "6.12.18",
                  "vulnerable": true
                },
                {
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/microcode/AMD: Fix __apply_microcode_amd()\u0027s return value\n\nWhen verify_sha256_digest() fails, __apply_microcode_amd() should propagate\nthe failure by returning false (and not -1 which is promoted to true)."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The microcode loader is reached only locally \u2014 via the initrd/builtin blob at boot, CPU hotplug/resume, or a write to `/sys/devices/system/cpu/microcode/reload`; there is no network-reachable path, and the resulting unmitigated-CPU exposure is exploited by local code.\nAC:L - The wrong return value is deterministic \u2014 every microcode blob whose SHA256 digest is not in the kernel\u0027s hardcoded `phashes[]` table takes the buggy path with 100% reliability, with no race, timing window, or memory-layout dependency.\nPR:L - The vulnerable state (forged `boot_cpu_data.microcode`, cleared Zenbleed chicken bit, false \"updated\" report) is produced by ordinary unattended microcode loading, so an attacker needs no more than an unprivileged local account to then exploit the CPU errata that the kernel wrongly believes are fixed.\nUI:N - No victim action is required \u2014 early loading from initrd runs on every boot and `load_ucode_amd_ap()`/`mc_bp_resume()` run on every CPU bring-up and resume, all automatically.\nS:U - The defeated integrity check, the corrupted `boot_cpu_data.microcode` state and the mis-set `MSR_AMD64_DE_CFG` chicken bit all live within the host kernel/CPU security authority; no VMM or IOMMU boundary is crossed by the flaw itself.\nC:H - Clearing `MSR_AMD64_DE_CFG_ZEN2_FP_BACKUP_FIX_BIT` on the basis of a forged revision re-enables Zenbleed (CVE-2023-20593), giving unprivileged local code a cross-process/cross-VM read of register contents including keys and passwords, and the un-applied blob also carries speculative-execution mitigations.\nI:H - An attacker/blob-controlled 32-bit `hdr.patch_id` is written unverified into kernel security state (`boot_cpu_data.microcode`, `c-\u003emicrocode`, cpuinfo), and that value directly drives modification of a hardware protection mechanism via `msr_clear_bit()` \u2014 a full bypass of the integrity check the code exists to enforce.\nA:H - The kernel reports a successful update while the CPU keeps running old microcode, so errata that AMD patches fix \u2014 including hang- and machine-check-inducing ones and the erratum 1386 XSAVES malfunction gated on the forged revision \u2014 remain live with no signal to the operator."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:56:19.652Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/763f4d638f71cb45235395790a46e9f9e84227fd"
        },
        {
          "url": "https://git.kernel.org/stable/c/ada88219d5315fc13f2910fe278c7112d8d68889"
        },
        {
          "url": "https://git.kernel.org/stable/c/d295c58fad1d5ab987a81f139dd21498732c4f13"
        },
        {
          "url": "https://git.kernel.org/stable/c/7f705a45f130a85fbf31c2abdc999c65644c8307"
        },
        {
          "url": "https://git.kernel.org/stable/c/31ab12df723543047c3fc19cb8f8c4498ec6267f"
        }
      ],
      "title": "x86/microcode/AMD: Fix __apply_microcode_amd()\u0027s return value",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-22047",
    "datePublished": "2025-04-16T14:12:07.061Z",
    "dateReserved": "2024-12-29T08:45:45.810Z",
    "dateUpdated": "2026-08-05T11:56:19.652Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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