ubuntu-cve-2025-26601
Vulnerability from osv_ubuntu
Published
2025-02-25 15:00
Modified
2026-04-22 07:54
Summary
Details

A use-after-free flaw was found in X.Org and Xwayland. When changing an alarm, the values of the change mask are evaluated one after the other, changing the trigger values as requested, and eventually, SyncInitTrigger() is called. If one of the changes triggers an error, the function will return early, not adding the new sync object, possibly causing a use-after-free when the alarm eventually triggers.

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
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
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          {
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        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "xnest",
            "binary_version": "2:21.1.4-2ubuntu1.7~22.04.13"
          },
          {
            "binary_name": "xorg-server-source",
            "binary_version": "2:21.1.4-2ubuntu1.7~22.04.13"
          },
          {
            "binary_name": "xserver-common",
            "binary_version": "2:21.1.4-2ubuntu1.7~22.04.13"
          },
          {
            "binary_name": "xserver-xephyr",
            "binary_version": "2:21.1.4-2ubuntu1.7~22.04.13"
          },
          {
            "binary_name": "xserver-xorg-core",
            "binary_version": "2:21.1.4-2ubuntu1.7~22.04.13"
          },
          {
            "binary_name": "xserver-xorg-legacy",
            "binary_version": "2:21.1.4-2ubuntu1.7~22.04.13"
          },
          {
            "binary_name": "xvfb",
            "binary_version": "2:21.1.4-2ubuntu1.7~22.04.13"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "xorg-server",
        "purl": "pkg:deb/ubuntu/xorg-server@2:21.1.4-2ubuntu1.7~22.04.13?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:21.1.4-2ubuntu1.7~22.04.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:1.20.13-1ubuntu1",
        "2:1.20.13-1ubuntu2",
        "2:1.20.14-1ubuntu1",
        "2:21.1.3-2ubuntu2",
        "2:21.1.3-2ubuntu2.1",
        "2:21.1.3-2ubuntu2.2",
        "2:21.1.3-2ubuntu2.3",
        "2:21.1.3-2ubuntu2.4",
        "2:21.1.3-2ubuntu2.5",
        "2:21.1.3-2ubuntu2.6",
        "2:21.1.3-2ubuntu2.7",
        "2:21.1.3-2ubuntu2.8",
        "2:21.1.3-2ubuntu2.9",
        "2:21.1.4-2ubuntu1.7~22.04.1",
        "2:21.1.4-2ubuntu1.7~22.04.2",
        "2:21.1.4-2ubuntu1.7~22.04.5",
        "2:21.1.4-2ubuntu1.7~22.04.7",
        "2:21.1.4-2ubuntu1.7~22.04.8",
        "2:21.1.4-2ubuntu1.7~22.04.9",
        "2:21.1.4-2ubuntu1.7~22.04.10",
        "2:21.1.4-2ubuntu1.7~22.04.11",
        "2:21.1.4-2ubuntu1.7~22.04.12"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "xwayland",
            "binary_version": "2:22.1.1-1ubuntu0.17"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "xwayland",
        "purl": "pkg:deb/ubuntu/xwayland@2:22.1.1-1ubuntu0.17?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:22.1.1-1ubuntu0.17"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:21.1.2-0ubuntu1",
        "2:21.1.3-1",
        "2:21.1.3-1ubuntu1",
        "2:21.1.4-1",
        "2:22.1.0-1",
        "2:22.1.1-1",
        "2:22.1.1-1ubuntu0.1",
        "2:22.1.1-1ubuntu0.2",
        "2:22.1.1-1ubuntu0.3",
        "2:22.1.1-1ubuntu0.4",
        "2:22.1.1-1ubuntu0.5",
        "2:22.1.1-1ubuntu0.6",
        "2:22.1.1-1ubuntu0.7",
        "2:22.1.1-1ubuntu0.9",
        "2:22.1.1-1ubuntu0.10",
        "2:22.1.1-1ubuntu0.11",
        "2:22.1.1-1ubuntu0.12",
        "2:22.1.1-1ubuntu0.13",
        "2:22.1.1-1ubuntu0.14",
        "2:22.1.1-1ubuntu0.15"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "xnest",
            "binary_version": "2:21.1.12-1ubuntu1.2"
          },
          {
            "binary_name": "xorg-server-source",
            "binary_version": "2:21.1.12-1ubuntu1.2"
          },
          {
            "binary_name": "xserver-common",
            "binary_version": "2:21.1.12-1ubuntu1.2"
          },
          {
            "binary_name": "xserver-xephyr",
            "binary_version": "2:21.1.12-1ubuntu1.2"
          },
          {
            "binary_name": "xserver-xorg-core",
            "binary_version": "2:21.1.12-1ubuntu1.2"
          },
          {
            "binary_name": "xserver-xorg-legacy",
            "binary_version": "2:21.1.12-1ubuntu1.2"
          },
          {
            "binary_name": "xvfb",
            "binary_version": "2:21.1.12-1ubuntu1.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "xorg-server",
        "purl": "pkg:deb/ubuntu/xorg-server@2:21.1.12-1ubuntu1.2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:21.1.12-1ubuntu1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:21.1.7-3ubuntu2",
        "2:21.1.7-3ubuntu2.1",
        "2:21.1.10-1ubuntu1",
        "2:21.1.11-2ubuntu1",
        "2:21.1.12-1ubuntu1",
        "2:21.1.12-1ubuntu1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "xwayland",
            "binary_version": "2:23.2.6-1ubuntu0.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "xwayland",
        "purl": "pkg:deb/ubuntu/xwayland@2:23.2.6-1ubuntu0.4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:23.2.6-1ubuntu0.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:23.2.0-1",
        "2:23.2.0-1ubuntu0.1",
        "2:23.2.3-1",
        "2:23.2.4-1",
        "2:23.2.4-1build1",
        "2:23.2.4-1build2",
        "2:23.2.4-1build3",
        "2:23.2.6-1",
        "2:23.2.6-1ubuntu0.1",
        "2:23.2.6-1ubuntu0.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "xnest",
            "binary_version": "2:21.1.16-1ubuntu1"
          },
          {
            "binary_name": "xorg-server-source",
            "binary_version": "2:21.1.16-1ubuntu1"
          },
          {
            "binary_name": "xserver-common",
            "binary_version": "2:21.1.16-1ubuntu1"
          },
          {
            "binary_name": "xserver-xephyr",
            "binary_version": "2:21.1.16-1ubuntu1"
          },
          {
            "binary_name": "xserver-xorg-core",
            "binary_version": "2:21.1.16-1ubuntu1"
          },
          {
            "binary_name": "xserver-xorg-legacy",
            "binary_version": "2:21.1.16-1ubuntu1"
          },
          {
            "binary_name": "xvfb",
            "binary_version": "2:21.1.16-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "xorg-server",
        "purl": "pkg:deb/ubuntu/xorg-server@2:21.1.16-1ubuntu1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:21.1.16-1ubuntu1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [],
  "details": "A use-after-free flaw was found in X.Org and Xwayland. When changing an alarm, the values of the change mask are evaluated one after the other, changing the trigger values as requested, and eventually, SyncInitTrigger() is called. If one of the changes triggers an error, the function will return early, not adding the new sync object, possibly causing a use-after-free when the alarm eventually triggers.",
  "id": "UBUNTU-CVE-2025-26601",
  "modified": "2026-04-22T07:54:09Z",
  "published": "2025-02-25T15:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-26601"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-26601"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7299-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7299-2"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7299-3"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7299-4"
    }
  ],
  "related": [
    "USN-7299-1",
    "USN-7299-2",
    "USN-7299-3",
    "USN-7299-4"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2025-26601"
  ]
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.