USN-8621-1 (UBUNTU-CVE-2026-6949)

Vulnerability from osv_ubuntu – Published: 2026-07-28 11:50 – Updated: 2026-08-17 09:46 – Source website
VLAI
Summary
samba vulnerabilities
Details

It was discovered that Samba's pam_winbind incorrectly handled home directory ownership when mkhomedir was enabled. A local attacker could possibly use this issue to cause a denial of service by triggering a change in ownership of the root directory. (CVE-2026-15779)

Arjun Basnet, Douglas Bagnall, and Andrew Tridgell discovered that Samba incorrectly handled TSIG packets with name compression. A remote attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service. (CVE-2026-6949)

Tristan Madani discovered that Samba incorrectly handled malformed ASN.1 kpasswd packets. An authenticated user could possibly use this issue to cause Samba to crash, resulting in a denial of service. (CVE-2026-58216)

Andrew Tridgell and Tristan Madani discovered that Samba incorrectly handled TKEY name registration. A remote attacker could possibly use this issue to exhaust the TKEY name cache, resulting in a denial of service. (CVE-2026-58218)

It was discovered that Samba incorrectly handled internal LDB special directory names when processing authenticated LDAP requests. An authenticated user could possibly use this issue to perform unauthorized modifications and gain control of a domain. (CVE-2026-58221)

Andrew Tridgell and Tristan Madani discovered that Samba incorrectly handled LDAP Compare requests. An authenticated user could possibly use this issue to obtain sensitive information. (CVE-2026-58222)

Tristan Madani, Andrew Tridgell, and Martin Schwenke discovered that the CTDB protocol in Samba had insufficient bounds checking. A remote attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service. (CVE-2026-58224)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-6949",
              "severity": [
                {
                  "score": "medium",
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                }
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              "severity": [
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                  "type": "CVSS_V3"
                },
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                  "score": "medium",
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                }
              ]
            },
            {
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                },
                {
                  "score": "medium",
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              ]
            },
            {
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              "severity": [
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                  "type": "CVSS_V3"
                },
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                }
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            },
            {
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                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-58222",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
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                }
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            },
            {
              "id": "CVE-2026-58224",
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                }
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                },
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                  "type": "Ubuntu"
                }
              ]
            },
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              "id": "CVE-2026-58218",
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              "id": "CVE-2026-58221",
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                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-58222",
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                },
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                  "type": "Ubuntu"
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              "id": "CVE-2026-58224",
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                }
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                  "type": "Ubuntu"
                }
              ]
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            {
              "id": "CVE-2026-15779",
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                {
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                  "type": "CVSS_V3"
                },
                {
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                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-58216",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-58218",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                  "type": "CVSS_V3"
                },
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                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-58221",
              "severity": [
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-58222",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
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            {
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                  "type": "CVSS_V3"
                },
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                  "score": "medium",
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                }
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          ],
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        }
      },
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          },
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        "name": "samba",
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  ],
  "aliases": [],
  "details": "It was discovered that Samba\u0027s pam_winbind incorrectly handled home\ndirectory ownership when mkhomedir was enabled. A local attacker could\npossibly use this issue to cause a denial of service by triggering a change\nin ownership of the root directory. (CVE-2026-15779)\n\nArjun Basnet, Douglas Bagnall, and Andrew Tridgell discovered that Samba\nincorrectly handled TSIG packets with name compression. A remote attacker\ncould possibly use this issue to cause Samba to crash, resulting in a\ndenial of service. (CVE-2026-6949)\n\nTristan Madani discovered that Samba incorrectly handled malformed ASN.1\nkpasswd packets. An authenticated user could possibly use this issue to\ncause Samba to crash, resulting in a denial of service. (CVE-2026-58216)\n\nAndrew Tridgell and Tristan Madani discovered that Samba incorrectly\nhandled TKEY name registration. A remote attacker could possibly use this\nissue to exhaust the TKEY name cache, resulting in a denial of service.\n(CVE-2026-58218)\n\nIt was discovered that Samba incorrectly handled internal LDB special\ndirectory names when processing authenticated LDAP requests. An\nauthenticated user could possibly use this issue to perform unauthorized\nmodifications and gain control of a domain. (CVE-2026-58221)\n\nAndrew Tridgell and Tristan Madani discovered that Samba incorrectly\nhandled LDAP Compare requests. An authenticated user could possibly use\nthis issue to obtain sensitive information. (CVE-2026-58222)\n\nTristan Madani, Andrew Tridgell, and Martin Schwenke discovered that the\nCTDB protocol in Samba had insufficient bounds checking. A remote attacker\ncould possibly use this issue to cause Samba to crash, resulting in a\ndenial of service. (CVE-2026-58224)",
  "id": "USN-8621-1",
  "modified": "2026-08-17T09:46:26Z",
  "published": "2026-07-28T11:50:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8621-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-6949"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-15779"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-58216"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-58218"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-58221"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-58222"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-58224"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "samba vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-6949",
    "UBUNTU-CVE-2026-15779",
    "UBUNTU-CVE-2026-58216",
    "UBUNTU-CVE-2026-58218",
    "UBUNTU-CVE-2026-58221",
    "UBUNTU-CVE-2026-58222",
    "UBUNTU-CVE-2026-58224"
  ]
}



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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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    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.