UBUNTU-CVE-2026-29008

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Source
https://ubuntu.com/security/CVE-2026-29008
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29008.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-29008
Upstream
Published
2026-07-08T17:17:00Z
Modified
2026-07-15T19:45:25.296226415Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

U-Boot through 2026.04-rc3 contains an integer underflow vulnerability in the tcprxstatemachine() function (net/tcp.c) that allows a network-adjacent attacker to crash the bootloader by sending a malformed TCP SYN+ACK packet with a manipulated data offset field causing payloadlen to become negative. When the TCPSYNSENT handler calls tcprxuserdata() without invoking tcpseginwnd() validation, the negative payloadlen is implicitly converted to a large unsigned integer (e.g., 0xFFFFFFD8) and passed to memcpy() in storeblock(), causing an immediate crash that prevents device boot and may enable memory corruption when CONFIG_LMB is disabled.

References

Affected packages

Ubuntu:16.04:LTS
u-boot

Package

Name
u-boot
Purl
pkg:deb/ubuntu/u-boot?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2015.*
2015.04+dfsg1-2ubuntu1
2015.10+dfsg1-2
2015.10+dfsg1-3
2015.10+dfsg1-4
2016.*
2016.01+dfsg1-1
2016.01+dfsg1-1ubuntu1
2016.01+dfsg1-2ubuntu1
2016.01+dfsg1-2ubuntu2
2016.01+dfsg1-2ubuntu3
2016.01+dfsg1-2ubuntu5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2016.01+dfsg1-2ubuntu5",
            "binary_name": "u-boot"
        },
        {
            "binary_name": "u-boot-exynos",
            "binary_version": "2016.01+dfsg1-2ubuntu5"
        },
        {
            "binary_name": "u-boot-imx",
            "binary_version": "2016.01+dfsg1-2ubuntu5"
        },
        {
            "binary_version": "2016.01+dfsg1-2ubuntu5",
            "binary_name": "u-boot-omap"
        },
        {
            "binary_name": "u-boot-rockchip",
            "binary_version": "2016.01+dfsg1-2ubuntu5"
        },
        {
            "binary_version": "2016.01+dfsg1-2ubuntu5",
            "binary_name": "u-boot-rpi"
        },
        {
            "binary_version": "2016.01+dfsg1-2ubuntu5",
            "binary_name": "u-boot-sunxi"
        },
        {
            "binary_name": "u-boot-tegra",
            "binary_version": "2016.01+dfsg1-2ubuntu5"
        },
        {
            "binary_version": "2016.01+dfsg1-2ubuntu5",
            "binary_name": "u-boot-tools"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29008.json"
Ubuntu:18.04:LTS
u-boot

Package

Name
u-boot
Purl
pkg:deb/ubuntu/u-boot?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2016.*
2016.03+dfsg1-6ubuntu2
2018.*
2018.07~rc3+dfsg1-0ubuntu1~18.04.1
2018.07~rc3+dfsg1-0ubuntu2~18.04.1
2018.07~rc3+dfsg1-0ubuntu3~18.04.1
2019.*
2019.07+dfsg-1ubuntu4~18.04.1
2020.*
2020.10+dfsg-1ubuntu0~18.04.2
2020.10+dfsg-1ubuntu0~18.04.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "u-boot",
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3"
        },
        {
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3",
            "binary_name": "u-boot-amlogic"
        },
        {
            "binary_name": "u-boot-exynos",
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3"
        },
        {
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3",
            "binary_name": "u-boot-imx"
        },
        {
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3",
            "binary_name": "u-boot-mvebu"
        },
        {
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3",
            "binary_name": "u-boot-omap"
        },
        {
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3",
            "binary_name": "u-boot-qcom"
        },
        {
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3",
            "binary_name": "u-boot-qemu"
        },
        {
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3",
            "binary_name": "u-boot-rockchip"
        },
        {
            "binary_name": "u-boot-rpi",
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3"
        },
        {
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3",
            "binary_name": "u-boot-sunxi"
        },
        {
            "binary_name": "u-boot-tegra",
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3"
        },
        {
            "binary_name": "u-boot-tools",
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29008.json"
Ubuntu:20.04:LTS
u-boot

Package

Name
u-boot
Purl
pkg:deb/ubuntu/u-boot?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2019.*
2019.07+dfsg-1ubuntu3
2019.07+dfsg-1ubuntu5
2019.07+dfsg-1ubuntu6
2020.*
2020.10+dfsg-1ubuntu0~20.04.2
2021.*
2021.01+dfsg-3ubuntu0~20.04.1
2021.01+dfsg-3ubuntu0~20.04.3
2021.01+dfsg-3ubuntu0~20.04.4
2021.01+dfsg-3ubuntu0~20.04.5
2021.01+dfsg-3ubuntu0~20.04.6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6",
            "binary_name": "u-boot"
        },
        {
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6",
            "binary_name": "u-boot-amlogic"
        },
        {
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6",
            "binary_name": "u-boot-exynos"
        },
        {
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6",
            "binary_name": "u-boot-imx"
        },
        {
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6",
            "binary_name": "u-boot-mvebu"
        },
        {
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6",
            "binary_name": "u-boot-omap"
        },
        {
            "binary_name": "u-boot-qcom",
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6"
        },
        {
            "binary_name": "u-boot-qemu",
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6"
        },
        {
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6",
            "binary_name": "u-boot-rockchip"
        },
        {
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6",
            "binary_name": "u-boot-rpi"
        },
        {
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6",
            "binary_name": "u-boot-sifive"
        },
        {
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6",
            "binary_name": "u-boot-sunxi"
        },
        {
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6",
            "binary_name": "u-boot-tegra"
        },
        {
            "binary_name": "u-boot-tools",
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29008.json"
Ubuntu:22.04:LTS
u-boot

Package

Name
u-boot
Purl
pkg:deb/ubuntu/u-boot?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2021.*
2021.07+dfsg-0ubuntu8
2021.07+dfsg-0ubuntu9
2021.07+dfsg-0ubuntu10
2022.*
2022.01+dfsg-2ubuntu1
2022.01+dfsg-2ubuntu2
2022.01+dfsg-2ubuntu2.1
2022.01+dfsg-2ubuntu2.3
2022.01+dfsg-2ubuntu2.4
2022.01+dfsg-2ubuntu2.5
2022.01+dfsg-2ubuntu2.6
2022.01+dfsg-2ubuntu2.7

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2022.01+dfsg-2ubuntu2.7",
            "binary_name": "u-boot"
        },
        {
            "binary_version": "2022.01+dfsg-2ubuntu2.7",
            "binary_name": "u-boot-amlogic"
        },
        {
            "binary_version": "2022.01+dfsg-2ubuntu2.7",
            "binary_name": "u-boot-exynos"
        },
        {
            "binary_version": "2022.01+dfsg-2ubuntu2.7",
            "binary_name": "u-boot-imx"
        },
        {
            "binary_version": "2022.01+dfsg-2ubuntu2.7",
            "binary_name": "u-boot-microchip"
        },
        {
            "binary_version": "2022.01+dfsg-2ubuntu2.7",
            "binary_name": "u-boot-mvebu"
        },
        {
            "binary_version": "2022.01+dfsg-2ubuntu2.7",
            "binary_name": "u-boot-omap"
        },
        {
            "binary_name": "u-boot-qcom",
            "binary_version": "2022.01+dfsg-2ubuntu2.7"
        },
        {
            "binary_name": "u-boot-qemu",
            "binary_version": "2022.01+dfsg-2ubuntu2.7"
        },
        {
            "binary_version": "2022.01+dfsg-2ubuntu2.7",
            "binary_name": "u-boot-rockchip"
        },
        {
            "binary_name": "u-boot-rpi",
            "binary_version": "2022.01+dfsg-2ubuntu2.7"
        },
        {
            "binary_name": "u-boot-sifive",
            "binary_version": "2022.01+dfsg-2ubuntu2.7"
        },
        {
            "binary_name": "u-boot-sunxi",
            "binary_version": "2022.01+dfsg-2ubuntu2.7"
        },
        {
            "binary_version": "2022.01+dfsg-2ubuntu2.7",
            "binary_name": "u-boot-tegra"
        },
        {
            "binary_version": "2022.01+dfsg-2ubuntu2.7",
            "binary_name": "u-boot-tools"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29008.json"
u-boot-nezha

Package

Name
u-boot-nezha
Purl
pkg:deb/ubuntu/u-boot-nezha?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2021.*
2021.09+git20211008.62392d3-0ubuntu1
2022.*
2022.04+git20220405.7446a472-0ubuntu0.1
2022.04+git20220405.7446a472-0ubuntu0.2
2022.04+git20220405.7446a472-0ubuntu0.3
2022.04+git20220405.7446a472-0ubuntu0.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2022.04+git20220405.7446a472-0ubuntu0.4",
            "binary_name": "u-boot-nezha"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29008.json"
Ubuntu:24.04:LTS
u-boot

Package

Name
u-boot
Purl
pkg:deb/ubuntu/u-boot?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2023.*
2023.07+dfsg-1ubuntu2
2024.*
2024.01+dfsg-1ubuntu1
2024.01+dfsg-1ubuntu2
2024.01+dfsg-1ubuntu3
2024.01+dfsg-1ubuntu4
2024.01+dfsg-1ubuntu5
2024.01+dfsg-1ubuntu5.1
2024.01+dfsg-1ubuntu5.2
2025.*
2025.01-0ubuntu0.24.04.1
2025.01-0ubuntu0.24.04.2
2025.10-0ubuntu0.24.04.1
2025.10-0ubuntu0.24.04.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "u-boot-amlogic",
            "binary_version": "2025.10-0ubuntu0.24.04.2"
        },
        {
            "binary_version": "2025.10-0ubuntu0.24.04.2",
            "binary_name": "u-boot-amlogic-binaries"
        },
        {
            "binary_version": "2025.10-0ubuntu0.24.04.2",
            "binary_name": "u-boot-asahi"
        },
        {
            "binary_version": "2025.10-0ubuntu0.24.04.2",
            "binary_name": "u-boot-exynos"
        },
        {
            "binary_version": "2025.10-0ubuntu0.24.04.2",
            "binary_name": "u-boot-exynos-binaries"
        },
        {
            "binary_version": "2025.10-0ubuntu0.24.04.2",
            "binary_name": "u-boot-imx"
        },
        {
            "binary_version": "2025.10-0ubuntu0.24.04.2",
            "binary_name": "u-boot-microchip"
        },
        {
            "binary_version": "2025.10-0ubuntu0.24.04.2",
            "binary_name": "u-boot-mvebu"
        },
        {
            "binary_version": "2025.10-0ubuntu0.24.04.2",
            "binary_name": "u-boot-omap"
        },
        {
            "binary_version": "2025.10-0ubuntu0.24.04.2",
            "binary_name": "u-boot-qcom"
        },
        {
            "binary_version": "2025.10-0ubuntu0.24.04.2",
            "binary_name": "u-boot-qemu"
        },
        {
            "binary_version": "2025.10-0ubuntu0.24.04.2",
            "binary_name": "u-boot-rockchip"
        },
        {
            "binary_version": "2025.10-0ubuntu0.24.04.2",
            "binary_name": "u-boot-rpi"
        },
        {
            "binary_version": "2025.10-0ubuntu0.24.04.2",
            "binary_name": "u-boot-sifive"
        },
        {
            "binary_name": "u-boot-sitara-binaries",
            "binary_version": "2025.10-0ubuntu0.24.04.2"
        },
        {
            "binary_version": "2025.10-0ubuntu0.24.04.2",
            "binary_name": "u-boot-starfive"
        },
        {
            "binary_name": "u-boot-stm32",
            "binary_version": "2025.10-0ubuntu0.24.04.2"
        },
        {
            "binary_version": "2025.10-0ubuntu0.24.04.2",
            "binary_name": "u-boot-sunxi"
        },
        {
            "binary_version": "2025.10-0ubuntu0.24.04.2",
            "binary_name": "u-boot-tegra"
        },
        {
            "binary_version": "2025.10-0ubuntu0.24.04.2",
            "binary_name": "u-boot-tools"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29008.json"
u-boot-nezha

Package

Name
u-boot-nezha
Purl
pkg:deb/ubuntu/u-boot-nezha?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2022.*
2022.10-1089-g528ae9bc6c-0ubuntu2
2024.*
2024.01~rc1-190-g2e89b706f5-0ubuntu1
2024.01~rc1-190-g2e89b706f5-0ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "u-boot-nezha",
            "binary_version": "2024.01~rc1-190-g2e89b706f5-0ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29008.json"
Ubuntu:25.10
u-boot

Package

Name
u-boot
Purl
pkg:deb/ubuntu/u-boot?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2025.*
2025.01-1~0ubuntu2
2025.01-3ubuntu1
2025.01-3ubuntu2
2025.01-3ubuntu4
2025.10-0ubuntu0.25.10.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2025.10-0ubuntu0.25.10.1",
            "binary_name": "u-boot-amlogic"
        },
        {
            "binary_version": "2025.10-0ubuntu0.25.10.1",
            "binary_name": "u-boot-amlogic-binaries"
        },
        {
            "binary_version": "2025.10-0ubuntu0.25.10.1",
            "binary_name": "u-boot-asahi"
        },
        {
            "binary_version": "2025.10-0ubuntu0.25.10.1",
            "binary_name": "u-boot-exynos"
        },
        {
            "binary_version": "2025.10-0ubuntu0.25.10.1",
            "binary_name": "u-boot-exynos-binaries"
        },
        {
            "binary_version": "2025.10-0ubuntu0.25.10.1",
            "binary_name": "u-boot-imx"
        },
        {
            "binary_version": "2025.10-0ubuntu0.25.10.1",
            "binary_name": "u-boot-microchip"
        },
        {
            "binary_name": "u-boot-mvebu",
            "binary_version": "2025.10-0ubuntu0.25.10.1"
        },
        {
            "binary_version": "2025.10-0ubuntu0.25.10.1",
            "binary_name": "u-boot-omap"
        },
        {
            "binary_name": "u-boot-qcom",
            "binary_version": "2025.10-0ubuntu0.25.10.1"
        },
        {
            "binary_version": "2025.10-0ubuntu0.25.10.1",
            "binary_name": "u-boot-qemu"
        },
        {
            "binary_version": "2025.10-0ubuntu0.25.10.1",
            "binary_name": "u-boot-rockchip"
        },
        {
            "binary_version": "2025.10-0ubuntu0.25.10.1",
            "binary_name": "u-boot-rpi"
        },
        {
            "binary_version": "2025.10-0ubuntu0.25.10.1",
            "binary_name": "u-boot-sifive"
        },
        {
            "binary_version": "2025.10-0ubuntu0.25.10.1",
            "binary_name": "u-boot-sitara-binaries"
        },
        {
            "binary_version": "2025.10-0ubuntu0.25.10.1",
            "binary_name": "u-boot-starfive"
        },
        {
            "binary_version": "2025.10-0ubuntu0.25.10.1",
            "binary_name": "u-boot-stm32"
        },
        {
            "binary_version": "2025.10-0ubuntu0.25.10.1",
            "binary_name": "u-boot-sunxi"
        },
        {
            "binary_version": "2025.10-0ubuntu0.25.10.1",
            "binary_name": "u-boot-tegra"
        },
        {
            "binary_version": "2025.10-0ubuntu0.25.10.1",
            "binary_name": "u-boot-tools"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29008.json"
Ubuntu:26.04:LTS
u-boot

Package

Name
u-boot
Purl
pkg:deb/ubuntu/u-boot?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2025.*
2025.01-3ubuntu4
2025.10-0ubuntu1
2025.10-0ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "u-boot-amlogic",
            "binary_version": "2025.10-0ubuntu2"
        },
        {
            "binary_version": "2025.10-0ubuntu2",
            "binary_name": "u-boot-amlogic-binaries"
        },
        {
            "binary_version": "2025.10-0ubuntu2",
            "binary_name": "u-boot-asahi"
        },
        {
            "binary_version": "2025.10-0ubuntu2",
            "binary_name": "u-boot-exynos"
        },
        {
            "binary_version": "2025.10-0ubuntu2",
            "binary_name": "u-boot-exynos-binaries"
        },
        {
            "binary_name": "u-boot-imx",
            "binary_version": "2025.10-0ubuntu2"
        },
        {
            "binary_version": "2025.10-0ubuntu2",
            "binary_name": "u-boot-microchip"
        },
        {
            "binary_name": "u-boot-mvebu",
            "binary_version": "2025.10-0ubuntu2"
        },
        {
            "binary_version": "2025.10-0ubuntu2",
            "binary_name": "u-boot-omap"
        },
        {
            "binary_version": "2025.10-0ubuntu2",
            "binary_name": "u-boot-qcom"
        },
        {
            "binary_version": "2025.10-0ubuntu2",
            "binary_name": "u-boot-qemu"
        },
        {
            "binary_version": "2025.10-0ubuntu2",
            "binary_name": "u-boot-rockchip"
        },
        {
            "binary_version": "2025.10-0ubuntu2",
            "binary_name": "u-boot-rpi"
        },
        {
            "binary_name": "u-boot-sifive",
            "binary_version": "2025.10-0ubuntu2"
        },
        {
            "binary_name": "u-boot-sitara-binaries",
            "binary_version": "2025.10-0ubuntu2"
        },
        {
            "binary_version": "2025.10-0ubuntu2",
            "binary_name": "u-boot-starfive"
        },
        {
            "binary_version": "2025.10-0ubuntu2",
            "binary_name": "u-boot-stm32"
        },
        {
            "binary_name": "u-boot-sunxi",
            "binary_version": "2025.10-0ubuntu2"
        },
        {
            "binary_name": "u-boot-tegra",
            "binary_version": "2025.10-0ubuntu2"
        },
        {
            "binary_version": "2025.10-0ubuntu2",
            "binary_name": "u-boot-tools"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29008.json"