UBUNTU-CVE-2026-121996

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Source

https://ubuntu.com/security/CVE-2026-121996

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121996.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-121996

Upstream

CVE-2026-121996

Published

2026-11-06T00:00:00Z

Modified

2026-11-07T01:46:15Z

Severity

8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

A length validation flaw in gdbserver's agent-expression parser allows an unauthenticated remote attacker to read uninitialized heap memory from the gdbserver process and cause a denial of service. Disclosed heap content includes addresses suitable for defeating ASLR in further exploitation.

References

Affected packages

Ubuntu:20.04:LTS

gdb

Package

Name: gdb
Purl: pkg:deb/ubuntu/gdb?arch=source&distro=focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

8.*

8.3-0ubuntu1

9.*

9.0.50.20191019-0ubuntu1

9.0.50.20191119-0ubuntu1

9.0.90.20191216-0ubuntu1

9.0.90.20200105-0ubuntu1

9.0.90.20200117-0ubuntu1

9.1-0ubuntu1

9.2-0ubuntu1~20.04

9.2-0ubuntu1~20.04.1

9.2-0ubuntu1~20.04.2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "gdb",
            "binary_version": "9.2-0ubuntu1~20.04.2"
        },
        {
            "binary_name": "gdb-multiarch",
            "binary_version": "9.2-0ubuntu1~20.04.2"
        },
        {
            "binary_name": "gdb-source",
            "binary_version": "9.2-0ubuntu1~20.04.2"
        },
        {
            "binary_name": "gdbserver",
            "binary_version": "9.2-0ubuntu1~20.04.2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121996.json"

Ubuntu:22.04:LTS

gdb

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

11.*

11.1-0ubuntu2

11.1-0ubuntu3

11.2-0ubuntu1

12.*

12.0.50.20220217-0ubuntu1

12.0.90-0ubuntu1

12.1-0ubuntu1~22.04

12.1-0ubuntu1~22.04.2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "gdb",
            "binary_version": "12.1-0ubuntu1~22.04.2"
        },
        {
            "binary_name": "gdb-multiarch",
            "binary_version": "12.1-0ubuntu1~22.04.2"
        },
        {
            "binary_name": "gdb-source",
            "binary_version": "12.1-0ubuntu1~22.04.2"
        },
        {
            "binary_name": "gdbserver",
            "binary_version": "12.1-0ubuntu1~22.04.2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121996.json"

Ubuntu:24.04:LTS

gdb

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

14.*

14.0.50.20230907-0ubuntu1

14.1-0ubuntu1

14.1-0ubuntu2

15.*

15.0.50.20240219-0ubuntu1

15.0.50.20240320-0ubuntu1

15.0.50.20240403-0ubuntu1

15.1-1ubuntu1~24.04.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "gdb",
            "binary_version": "15.1-1ubuntu1~24.04.1"
        },
        {
            "binary_name": "gdb-multiarch",
            "binary_version": "15.1-1ubuntu1~24.04.1"
        },
        {
            "binary_name": "gdb-source",
            "binary_version": "15.1-1ubuntu1~24.04.1"
        },
        {
            "binary_name": "gdbserver",
            "binary_version": "15.1-1ubuntu1~24.04.1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121996.json"

Ubuntu:26.04:LTS

gdb

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

16.*

16.3-1ubuntu2

16.3-5ubuntu1

17.*

17.1-1ubuntu1

17.1-1ubuntu2

17.1-2ubuntu1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "gdb",
            "binary_version": "17.1-2ubuntu1"
        },
        {
            "binary_name": "gdb-minimal",
            "binary_version": "17.1-2ubuntu1"
        },
        {
            "binary_name": "gdb-multiarch",
            "binary_version": "17.1-2ubuntu1"
        },
        {
            "binary_name": "gdb-source",
            "binary_version": "17.1-2ubuntu1"
        },
        {
            "binary_name": "gdbserver",
            "binary_version": "17.1-2ubuntu1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121996.json"

Ubuntu:26.10

gdb

Package

Name: gdb
Purl: pkg:deb/ubuntu/gdb?arch=source&distro=stonking

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

17.*

17.1-2ubuntu1

17.2-1ubuntu1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "gdb",
            "binary_version": "17.2-1ubuntu1"
        },
        {
            "binary_name": "gdb-minimal",
            "binary_version": "17.2-1ubuntu1"
        },
        {
            "binary_name": "gdb-multiarch",
            "binary_version": "17.2-1ubuntu1"
        },
        {
            "binary_name": "gdb-source",
            "binary_version": "17.2-1ubuntu1"
        },
        {
            "binary_name": "gdbserver",
            "binary_version": "17.2-1ubuntu1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121996.json"

Ubuntu:Pro:16.04:LTS

gdb

Package

Name: gdb
Purl: pkg:deb/ubuntu/gdb?arch=source&distro=esm-infra%2Fxenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

7.*

7.10-1ubuntu2

7.10-1ubuntu3

7.10.1-0ubuntu1

7.10.90.20160215-0ubuntu2

7.10.90.20160220-0ubuntu1

7.11-0ubuntu1

7.11.1-0ubuntu1~16.04

7.11.1-0ubuntu1~16.5

7.11.1-0ubuntu1~16.5+esm1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "gdb",
            "binary_version": "7.11.1-0ubuntu1~16.5+esm1"
        },
        {
            "binary_name": "gdb-multiarch",
            "binary_version": "7.11.1-0ubuntu1~16.5+esm1"
        },
        {
            "binary_name": "gdb-source",
            "binary_version": "7.11.1-0ubuntu1~16.5+esm1"
        },
        {
            "binary_name": "gdb64",
            "binary_version": "7.11.1-0ubuntu1~16.5+esm1"
        },
        {
            "binary_name": "gdbserver",
            "binary_version": "7.11.1-0ubuntu1~16.5+esm1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121996.json"

Ubuntu:Pro:18.04:LTS

gdb

Package

Name: gdb
Purl: pkg:deb/ubuntu/gdb?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

8.*

8.0.1-0ubuntu1

8.0.1-0ubuntu2

8.0.1-0ubuntu3

8.1-0ubuntu1

8.1-0ubuntu2

8.1-0ubuntu3

8.1-0ubuntu3.1

8.1-0ubuntu3.2

8.1.1-0ubuntu1

8.1.1-0ubuntu1+esm1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "gdb",
            "binary_version": "8.1.1-0ubuntu1+esm1"
        },
        {
            "binary_name": "gdb-multiarch",
            "binary_version": "8.1.1-0ubuntu1+esm1"
        },
        {
            "binary_name": "gdb-source",
            "binary_version": "8.1.1-0ubuntu1+esm1"
        },
        {
            "binary_name": "gdbserver",
            "binary_version": "8.1.1-0ubuntu1+esm1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121996.json"