Vulnerability-Lookup

FKIE_CVE-2025-38421

Vulnerability from fkie_nvd - Published: 2025-07-25 15:15 - Updated: 2026-07-30 06:23

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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: platform/x86/amd: pmf: Use device managed allocations If setting up smart PC fails for any reason then this can lead to a double free when unloading amd-pmf. This is because dev->buf was freed but never set to NULL and is again freed in amd_pmf_remove(). To avoid subtle allocation bugs in failures leading to a double free change all allocations into device managed allocations.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0d10b532f861253c283863522d59d099fcb0796d	Patch
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d9db3a941270d92bbd1a6a6b54a10324484f2f2d	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.14
linux	linux_kernel	6.14
linux	linux_kernel	6.16
linux	linux_kernel	6.16

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/platform/x86/amd/pmf/core.c",
            "drivers/platform/x86/amd/pmf/tee-if.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0d10b532f861253c283863522d59d099fcb0796d",
              "status": "affected",
              "version": "5b1122fc4995f308b21d7cfc64ef9880ac834d20",
              "versionType": "git"
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            {
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            },
            {
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              "version": "e70b4b8f93d7fcf8ee063a1d1f18782c4da3d335",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3ed60e51ffdbfef14169bd967e21a6ba5e5ff42b",
              "versionType": "git"
            },
            {
              "lessThan": "6.13",
              "status": "affected",
              "version": "6.12.23",
              "versionType": "semver"
            },
            {
              "lessThan": "6.14",
              "status": "affected",
              "version": "6.13.11",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/platform/x86/amd/pmf/core.c",
            "drivers/platform/x86/amd/pmf/tee-if.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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              "version": "0",
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            },
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              "version": "6.15.4",
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            },
            {
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              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
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              "versionEndExcluding": "6.13",
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86/amd: pmf: Use device managed allocations\n\nIf setting up smart PC fails for any reason then this can lead to\na double free when unloading amd-pmf.  This is because dev-\u003ebuf was\nfreed but never set to NULL and is again freed in amd_pmf_remove().\n\nTo avoid subtle allocation bugs in failures leading to a double free\nchange all allocations into device managed allocations."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: platform/x86/amd: pmf: Usar asignaciones administradas por dispositivo. Si la configuraci\u00f3n de Smart PC falla por cualquier motivo, esto puede provocar una doble liberaci\u00f3n al descargar amd-pmf. Esto se debe a que dev-\u0026gt;buf se liber\u00f3, pero nunca se configur\u00f3 como NULL y se libera de nuevo en amd_pmf_remove(). Para evitar errores sutiles de asignaci\u00f3n en fallos que provoquen una doble liberaci\u00f3n, cambie todas las asignaciones a asignaciones administradas por dispositivo."
    }
  ],
  "id": "CVE-2025-38421",
  "lastModified": "2026-07-30T06:23:13.267",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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        "type": "Secondary"
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          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
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        "impactScore": 5.9,
        "source": "nvd@nist.gov",
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      }
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  "published": "2025-07-25T15:15:26.927",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/0d10b532f861253c283863522d59d099fcb0796d"
    },
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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        {
          "lang": "en",
          "value": "CWE-415"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2025-38421 (GCVE-0-2025-38421)

Vulnerability from cvelistv5 – Published: 2025-07-25 14:16 – Updated: 2026-08-05 12:01

Title

platform/x86/amd: pmf: Use device managed allocations

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/0d10b532f861253c2…
https://git.kernel.org/stable/c/d9db3a941270d92bb…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5b1122fc4995f308b21d7cfc64ef9880ac834d20 , < 0d10b532f861253c283863522d59d099fcb0796d (git) Affected: 5b1122fc4995f308b21d7cfc64ef9880ac834d20 , < d9db3a941270d92bbd1a6a6b54a10324484f2f2d (git) Affected: e70b4b8f93d7fcf8ee063a1d1f18782c4da3d335 (git) Affected: 3ed60e51ffdbfef14169bd967e21a6ba5e5ff42b (git) Affected: 6.12.23 , < 6.13 (semver) Affected: 6.13.11 , < 6.14 (semver)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.15.4 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/platform/x86/amd/pmf/core.c",
            "drivers/platform/x86/amd/pmf/tee-if.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "0d10b532f861253c283863522d59d099fcb0796d",
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              "versionType": "semver"
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            "drivers/platform/x86/amd/pmf/core.c",
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          ],
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          "vendor": "Linux",
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            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
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              "value": "AV:L - The amd-pmf platform driver is reachable only from the local machine \u2014 via driver unbind/module unload, the suspend/resume PM path, or the debugfs `update_policy` handler. There is no network or adjacent-network exposure.\nAC:L - On an affected system (AMD laptop whose BIOS advertises Smart PC while the PMF TA/policy is unavailable) `amd_pmf_init_smart_pc()` fails deterministically at every boot, leaving `dev-\u003ebuf`, `dev-\u003epolicy_buf` and `dev-\u003eprev_data` dangling, so the attacker simply triggers unbind or a suspend/resume cycle to hit the double free/UAF with 100% reliability.\nPR:L - The dangling `pdev-\u003ebuf` is dereferenced from `amd_pmf_resume_handler()`/`amd_pmf_restore_handler()` and from the re-armed `pb_work` handler, and an unprivileged local user in an active session can initiate suspend/resume through logind; heap grooming to control the reused slab object also needs only unprivileged allocations.\nUI:N - The attacker performs the triggering action themselves (driver unbind/module unload or a suspend/resume cycle); no separate victim needs to be induced into any action.\nS:U - The corrupted memory and the resulting privilege escalation are entirely within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stale `dev-\u003ebuf`/`dev-\u003eprev_data` pointers are read after free (`memcpy(\u0026dev-\u003em_table, dev-\u003ebuf, dev-\u003emtable_size)` in `amd_pmf_get_smu_info()`), leaking reallocated kernel slab contents, and the double free gives the attacker a slab object shared with another subsystem, which is a general kernel-memory read primitive.\nI:H - The double free of `dev-\u003ebuf` (and of `policy_buf`/`prev_data`) lets the same slab object be handed to two owners, and the UAF write paths (`memset(dev-\u003ebuf, 0, dev-\u003emtable_size)`, `dev-\u003eprev_data-\u003espl = val`, plus SMU DMA into the freed page programmed by `amd_pmf_set_dram_addr()`) provide a controlled write into live kernel objects, which is exploitable for control-flow hijack.\nA:H - A double free triggers immediate slab freelist corruption \u2014 a BUG/panic under freelist hardening or CONFIG_SLUB_DEBUG, and unbounded heap corruption leading to a crash otherwise; the UAF accesses from the PM resume path can be repeated to reliably crash the system."
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    "cveId": "CVE-2025-38421",
    "datePublished": "2025-07-25T14:16:42.409Z",
    "dateReserved": "2025-04-16T04:51:24.014Z",
    "dateUpdated": "2026-08-05T12:01:44.968Z",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.