USN-8376-1

It was discovered that FRR incorrectly handled certain OSPF Traffic Engineering and Segment Routing TLVs. An attacker could possibly use this issue to cause FRR to crash, resulting in a denial of service. (CVE-2026-28532)

It was discovered that FRR incorrectly handled certain BGP FlowSpec components. An attacker could possibly use this issue to cause FRR to crash, resulting in a denial of service. (CVE-2026-37457)

It was discovered that FRR did not properly validate certain MPREACHNLRI messages. An authenticated user could possibly use this issue to cause FRR to crash, resulting in a denial of service. (CVE-2026-37458)

It was discovered that FRR incorrectly handled processing certain BGP UPDATE messages. An attacker could possibly use this issue to cause FRR to crash, resulting in a denial of service. This issue only affected Ubuntu 25.04 and Ubuntu 25.10. (CVE-2026-37459)

References

Affected packages

Ubuntu:22.04:LTS / frr

Package

Name: frr
Purl: pkg:deb/ubuntu/frr?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

8.1-1ubuntu1.16

Affected versions

7.*

7.5.1-1.1

8.*

8.1-1

8.1-1ubuntu1

8.1-1ubuntu1.1

8.1-1ubuntu1.2

8.1-1ubuntu1.3

8.1-1ubuntu1.4

8.1-1ubuntu1.5

8.1-1ubuntu1.6

8.1-1ubuntu1.7

8.1-1ubuntu1.8

8.1-1ubuntu1.9

8.1-1ubuntu1.10

8.1-1ubuntu1.11

8.1-1ubuntu1.13

8.1-1ubuntu1.14

8.1-1ubuntu1.15

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "frr",
            "binary_version": "8.1-1ubuntu1.16"
        },
        {
            "binary_name": "frr-pythontools",
            "binary_version": "8.1-1ubuntu1.16"
        },
        {
            "binary_name": "frr-rpki-rtrlib",
            "binary_version": "8.1-1ubuntu1.16"
        },
        {
            "binary_name": "frr-snmp",
            "binary_version": "8.1-1ubuntu1.16"
        }
    ]
}

Database specific

cves_map

{
    "cves": [
        {
            "id": "CVE-2026-28532",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        },
        {
            "id": "CVE-2026-37457",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-37458",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:22.04:LTS"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8376-1.json"

Ubuntu:24.04:LTS / frr

Package

Name: frr
Purl: pkg:deb/ubuntu/frr?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

8.4.4-1.1ubuntu6.7

Affected versions

8.*

8.4.4-1.1ubuntu1

8.4.4-1.1ubuntu3

8.4.4-1.1ubuntu4

8.4.4-1.1ubuntu5

8.4.4-1.1ubuntu6

8.4.4-1.1ubuntu6.1

8.4.4-1.1ubuntu6.2

8.4.4-1.1ubuntu6.3

8.4.4-1.1ubuntu6.4

8.4.4-1.1ubuntu6.5

8.4.4-1.1ubuntu6.6

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "8.4.4-1.1ubuntu6.7",
            "binary_name": "frr"
        },
        {
            "binary_name": "frr-pythontools",
            "binary_version": "8.4.4-1.1ubuntu6.7"
        },
        {
            "binary_name": "frr-rpki-rtrlib",
            "binary_version": "8.4.4-1.1ubuntu6.7"
        },
        {
            "binary_version": "8.4.4-1.1ubuntu6.7",
            "binary_name": "frr-snmp"
        }
    ]
}

Database specific

cves_map

{
    "cves": [
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2026-28532"
        },
        {
            "id": "CVE-2026-37457",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2026-37458"
        }
    ],
    "ecosystem": "Ubuntu:24.04:LTS"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8376-1.json"

Ubuntu:25.10 / frr

Package

Name: frr
Purl: pkg:deb/ubuntu/frr?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

10.4.1-3ubuntu1.4

Affected versions

10.*

10.2.1-1ubuntu3

10.3-3ubuntu2

10.4.1-3ubuntu1

10.4.1-3ubuntu1.1

10.4.1-3ubuntu1.2

10.4.1-3ubuntu1.3

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "frr",
            "binary_version": "10.4.1-3ubuntu1.4"
        },
        {
            "binary_name": "frr-pythontools",
            "binary_version": "10.4.1-3ubuntu1.4"
        },
        {
            "binary_name": "frr-rpki-rtrlib",
            "binary_version": "10.4.1-3ubuntu1.4"
        },
        {
            "binary_version": "10.4.1-3ubuntu1.4",
            "binary_name": "frr-snmp"
        }
    ]
}

Database specific

cves_map

{
    "cves": [
        {
            "id": "CVE-2026-28532",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "score": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                    "type": "CVSS_V4"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-37457",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2026-37458"
        },
        {
            "id": "CVE-2026-37459",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:25.10"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8376-1.json"

Ubuntu:26.04:LTS / frr

Package

Name: frr
Purl: pkg:deb/ubuntu/frr?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

10.5.1-1ubuntu4.1

Affected versions

10.*

10.4.1-3ubuntu1

10.4.1-3ubuntu2

10.5.1-1ubuntu1

10.5.1-1ubuntu2

10.5.1-1ubuntu3

10.5.1-1ubuntu4

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "frr",
            "binary_version": "10.5.1-1ubuntu4.1"
        },
        {
            "binary_name": "frr-pythontools",
            "binary_version": "10.5.1-1ubuntu4.1"
        },
        {
            "binary_name": "frr-rpki-rtrlib",
            "binary_version": "10.5.1-1ubuntu4.1"
        },
        {
            "binary_name": "frr-snmp",
            "binary_version": "10.5.1-1ubuntu4.1"
        }
    ]
}

Database specific

cves_map

{
    "cves": [
        {
            "id": "CVE-2026-28532",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "score": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                    "type": "CVSS_V4"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2026-37457"
        },
        {
            "id": "CVE-2026-37458",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-37459",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:26.04:LTS"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8376-1.json"