ubuntu-cve-2026-25068
Vulnerability from osv_ubuntu
Published
2026-01-29 20:16
Modified
2026-06-09 15:14
Summary
Details

alsa-lib versions 1.2.2 up to and including 1.2.15.2, prior to commit 5f7fe33, contain a heap-based buffer overflow in the topology mixer control decoder. The tplg_decode_control_mixer1() function reads the num_channels field from untrusted .tplg data and uses it as a loop bound without validating it against the fixed-size channel array (SND_TPLG_MAX_CHAN). A crafted topology file with an excessive num_channels value can cause out-of-bounds heap writes, leading to a crash.

Severity
4.6 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "libasound2",
            "binary_version": "1.2.2-2.1ubuntu2.5+esm1"
          },
          {
            "binary_name": "libasound2-data",
            "binary_version": "1.2.2-2.1ubuntu2.5+esm1"
          },
          {
            "binary_name": "libasound2-plugin-smixer",
            "binary_version": "1.2.2-2.1ubuntu2.5+esm1"
          },
          {
            "binary_name": "libatopology2",
            "binary_version": "1.2.2-2.1ubuntu2.5+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "alsa-lib",
        "purl": "pkg:deb/ubuntu/alsa-lib@1.2.2-2.1ubuntu2.5+esm1?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.2-2.1ubuntu2.5+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.9-0ubuntu1",
        "1.2.1.2-2ubuntu2",
        "1.2.2-2ubuntu1",
        "1.2.2-2.1",
        "1.2.2-2.1ubuntu1",
        "1.2.2-2.1ubuntu2",
        "1.2.2-2.1ubuntu2.1",
        "1.2.2-2.1ubuntu2.2",
        "1.2.2-2.1ubuntu2.3",
        "1.2.2-2.1ubuntu2.4",
        "1.2.2-2.1ubuntu2.5"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libasound2",
            "binary_version": "1.2.6.1-1ubuntu1.1"
          },
          {
            "binary_name": "libasound2-data",
            "binary_version": "1.2.6.1-1ubuntu1.1"
          },
          {
            "binary_name": "libasound2-plugin-smixer",
            "binary_version": "1.2.6.1-1ubuntu1.1"
          },
          {
            "binary_name": "libatopology2",
            "binary_version": "1.2.6.1-1ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "alsa-lib",
        "purl": "pkg:deb/ubuntu/alsa-lib@1.2.6.1-1ubuntu1.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.6.1-1ubuntu1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.4-1.1ubuntu3",
        "1.2.4-1.1ubuntu4",
        "1.2.5.1-1ubuntu1",
        "1.2.6.1-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libasound2-data",
            "binary_version": "1.2.11-1ubuntu0.2"
          },
          {
            "binary_name": "libasound2-plugin-smixer",
            "binary_version": "1.2.11-1ubuntu0.2"
          },
          {
            "binary_name": "libasound2t64",
            "binary_version": "1.2.11-1ubuntu0.2"
          },
          {
            "binary_name": "libatopology2t64",
            "binary_version": "1.2.11-1ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "alsa-lib",
        "purl": "pkg:deb/ubuntu/alsa-lib@1.2.11-1ubuntu0.2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.11-1ubuntu0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.9-2",
        "1.2.10-1",
        "1.2.10-2",
        "1.2.10-3",
        "1.2.10-3build1",
        "1.2.11-1build1",
        "1.2.11-1build2",
        "1.2.11-1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libasound2-data",
            "binary_version": "1.2.14-1ubuntu1.1"
          },
          {
            "binary_name": "libasound2-plugin-smixer",
            "binary_version": "1.2.14-1ubuntu1.1"
          },
          {
            "binary_name": "libasound2t64",
            "binary_version": "1.2.14-1ubuntu1.1"
          },
          {
            "binary_name": "libatopology2t64",
            "binary_version": "1.2.14-1ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "alsa-lib",
        "purl": "pkg:deb/ubuntu/alsa-lib@1.2.14-1ubuntu1.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.14-1ubuntu1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.13-1build1",
        "1.2.14-1",
        "1.2.14-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libasound2-data",
            "binary_version": "1.2.15.3-1ubuntu1"
          },
          {
            "binary_name": "libasound2-plugin-smixer",
            "binary_version": "1.2.15.3-1ubuntu1"
          },
          {
            "binary_name": "libasound2t64",
            "binary_version": "1.2.15.3-1ubuntu1"
          },
          {
            "binary_name": "libatopology2t64",
            "binary_version": "1.2.15.3-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "alsa-lib",
        "purl": "pkg:deb/ubuntu/alsa-lib@1.2.15.3-1ubuntu1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.15.3-1ubuntu1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.14-1ubuntu1",
        "1.2.14-2ubuntu1",
        "1.2.15-2",
        "1.2.15.1-1",
        "1.2.15.3-1",
        "1.2.15.3-1build1"
      ]
    }
  ],
  "aliases": [],
  "details": "alsa-lib versions 1.2.2 up to and including 1.2.15.2, prior to commit 5f7fe33, contain a heap-based buffer overflow in the topology mixer control decoder. The tplg_decode_control_mixer1() function reads the num_channels field from untrusted .tplg data and uses it as a loop bound without validating it against the fixed-size channel array (SND_TPLG_MAX_CHAN). A crafted topology file with an excessive num_channels value can cause out-of-bounds heap writes, leading to a crash.",
  "id": "UBUNTU-CVE-2026-25068",
  "modified": "2026-06-09T15:14:26Z",
  "published": "2026-01-29T20:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-25068"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-25068"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/alsa-lib-topology-decoder-heap-based-buffer-overflow"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8044-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8044-2"
    }
  ],
  "related": [
    "USN-8044-1",
    "USN-8044-2"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-25068"
  ]
}



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