Vulnerability-Lookup

CVE-2025-71192 (GCVE-0-2025-71192)

Vulnerability from cvelistv5 – Published: 2026-02-04 16:00 – Updated: 2026-08-05 12:12

Title

ALSA: ac97: fix a double free in snd_ac97_controller_register()

Summary

In the Linux kernel, the following vulnerability has been resolved: ALSA: ac97: fix a double free in snd_ac97_controller_register() If ac97_add_adapter() fails, put_device() is the correct way to drop the device reference. kfree() is not required. Add kfree() if idr_alloc() fails and in ac97_adapter_release() to do the cleanup. Found by code review.

Severity

7 (High)


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

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/c80f9b3349a99a9d5…
https://git.kernel.org/stable/c/21f8bc5179bed91c3…
https://git.kernel.org/stable/c/fcc04c92cbb5497ce…
https://git.kernel.org/stable/c/cb73d37ac18bc1716…
https://git.kernel.org/stable/c/830988b6cf197e6dc…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 74426fbff66eea8e8d1f42c8238c268d1e63a832 , < c80f9b3349a99a9d5b295f5bbc23f544c5995ad7 (git) Affected: 74426fbff66eea8e8d1f42c8238c268d1e63a832 , < 21f8bc5179bed91c3f946adb5e55d717b891960c (git) Affected: 74426fbff66eea8e8d1f42c8238c268d1e63a832 , < fcc04c92cbb5497ce67c58dd2f0001bb87f40396 (git) Affected: 74426fbff66eea8e8d1f42c8238c268d1e63a832 , < cb73d37ac18bc1716690ff5255a0ef1952827e9e (git) Affected: 74426fbff66eea8e8d1f42c8238c268d1e63a832 , < 830988b6cf197e6dcffdfe2008c5738e6c6c3c0f (git)	guessed
Linux	Linux	Affected: 4.15 Unaffected: 0 , < 4.15 (semver) Unaffected: 6.1.161 , ≤ 6.1.* (semver) Unaffected: 6.6.121 , ≤ 6.6.* (semver) Unaffected: 6.12.66 , ≤ 6.12.* (semver) Unaffected: 6.18.6 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix)	guessed

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{
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/ac97/bus.c"
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          "vendor": "Linux",
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          "vendor": "Linux",
          "versions": [
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              "version": "4.15"
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              "lessThan": "4.15",
              "status": "unaffected",
              "version": "0",
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              "lessThanOrEqual": "6.6.*",
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              "versionType": "semver"
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              "version": "6.18.6",
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              "status": "unaffected",
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      "cpeApplicability": [
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        }
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      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable registration path is reached locally through PXA2xx platform-driver probing or module autoload; network traffic and physical AC\u201997 input cannot reach it.\nAC:H - Exploitation requires the uncommon condition that device registration fail after device initialization, plus favorable heap reuse; an attacker can encourage memory pressure but cannot reliably control these conditions.\nPR:L - A basic local user can initiate ALSA autoload activity and shape memory pressure while kernel or udev performs probing; no attacker-held administrative capability is checked by the vulnerable function.\nUI:N - No separate victim action is required once platform probing or module autoload begins.\nS:U - The corruption occurs within the host kernel and does not cross a separate virtualization, IOMMU, or other security authority.\nC:H - Reusing the multiply freed controller allocation can overlap its embedded struct device with attacker-influenced heap objects, enabling disclosure of kernel pointers and potentially arbitrary kernel memory.\nI:H - Freelist corruption and overlapping allocations can modify kernel objects, including device release and type function pointers, making arbitrary writes and kernel code execution defensible.\nA:H - The double free can immediately trigger allocator corruption detection, an oops, or a kernel panic, and corrupted reuse can crash the system later."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:12:29.458Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/c80f9b3349a99a9d5b295f5bbc23f544c5995ad7"
        },
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          "url": "https://git.kernel.org/stable/c/21f8bc5179bed91c3f946adb5e55d717b891960c"
        },
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          "url": "https://git.kernel.org/stable/c/fcc04c92cbb5497ce67c58dd2f0001bb87f40396"
        },
        {
          "url": "https://git.kernel.org/stable/c/cb73d37ac18bc1716690ff5255a0ef1952827e9e"
        },
        {
          "url": "https://git.kernel.org/stable/c/830988b6cf197e6dcffdfe2008c5738e6c6c3c0f"
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      ],
      "title": "ALSA: ac97: fix a double free in snd_ac97_controller_register()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-71192",
    "datePublished": "2026-02-04T16:00:23.044Z",
    "dateReserved": "2026-01-31T11:36:51.189Z",
    "dateUpdated": "2026-08-05T12:12:29.458Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-09-16",
      "epss": "0.00117",
      "percentile": "0.01913"
    },
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    "redhat_vex": {
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      "current_release_date": "2026-08-13T17:54:00+00:00",
      "cve": "CVE-2025-71192",
      "id": "CVE-2025-71192",
      "initial_release_date": "2025-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Kernel: Memory corruption via double free in ALSA AC97 controller",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-71192.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-28T16:47:37Z",
      "cve": "CVE-2025-71192",
      "id": "CVE-2025-71192",
      "initial_release_date": "2026-02-05T00:27:41Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "460",
      "product_status:known_not_affected": "301",
      "product_status:recommended": "280",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-71192",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-71192.json",
      "version": "27"
    }
  }
}

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.

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CVE-2025-71192 (GCVE-0-2025-71192)

WID-SEC-W-2026-0324

Tags

Sightings

Nomenclature

Related by attack behaviour