Vulnerability-Lookup

UBUNTU-CVE-2026-71973 (CVE-2026-71973)

Vulnerability from osv_ubuntu – Published: 2026-09-29 22:18 – Updated: 2026-10-21 20:15 – Source website

Details

U-Boot before 2026.10-rc4 contains an integer overflow vulnerability in sqfs_read_directory_table() function when allocating the directory table buffer. Attackers can supply a crafted SquashFS image with an attacker-controlled superblock metablks_count value that causes heap buffer under-allocation and out-of-bounds writes, corrupting heap memory and crashing the bootloader.

Severity

5.2 (Medium)


                    
                      CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

5.2 (Medium)


                    
                      CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-71973	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-71973	REPORT
	https://github.com/u-boot/u-boot	REPORT
	https://github.com/u-boot/u-boot/blob/v2026.07/fs…	REPORT
	https://github.com/u-boot/u-boot/commit/561ae28cb…	REPORT
	https://www.vulncheck.com/advisories/u-boot-befor…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "u-boot",
            "binary_version": "2016.01+dfsg1-2ubuntu5+esm2"
          },
          {
            "binary_name": "u-boot-exynos",
            "binary_version": "2016.01+dfsg1-2ubuntu5+esm2"
          },
          {
            "binary_name": "u-boot-imx",
            "binary_version": "2016.01+dfsg1-2ubuntu5+esm2"
          },
          {
            "binary_name": "u-boot-omap",
            "binary_version": "2016.01+dfsg1-2ubuntu5+esm2"
          },
          {
            "binary_name": "u-boot-rockchip",
            "binary_version": "2016.01+dfsg1-2ubuntu5+esm2"
          },
          {
            "binary_name": "u-boot-rpi",
            "binary_version": "2016.01+dfsg1-2ubuntu5+esm2"
          },
          {
            "binary_name": "u-boot-sunxi",
            "binary_version": "2016.01+dfsg1-2ubuntu5+esm2"
          },
          {
            "binary_name": "u-boot-tegra",
            "binary_version": "2016.01+dfsg1-2ubuntu5+esm2"
          },
          {
            "binary_name": "u-boot-tools",
            "binary_version": "2016.01+dfsg1-2ubuntu5+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "u-boot",
        "purl": "pkg:deb/ubuntu/u-boot@2016.01+dfsg1-2ubuntu5+esm2?arch=source\u0026distro=esm-infra-legacy/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2015.04+dfsg1-2ubuntu1",
        "2015.10+dfsg1-2",
        "2015.10+dfsg1-3",
        "2015.10+dfsg1-4",
        "2016.01+dfsg1-1",
        "2016.01+dfsg1-1ubuntu1",
        "2016.01+dfsg1-2ubuntu1",
        "2016.01+dfsg1-2ubuntu2",
        "2016.01+dfsg1-2ubuntu3",
        "2016.01+dfsg1-2ubuntu5",
        "2016.01+dfsg1-2ubuntu5+esm1",
        "2016.01+dfsg1-2ubuntu5+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "u-boot",
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
          },
          {
            "binary_name": "u-boot-amlogic",
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
          },
          {
            "binary_name": "u-boot-exynos",
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
          },
          {
            "binary_name": "u-boot-imx",
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
          },
          {
            "binary_name": "u-boot-mvebu",
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
          },
          {
            "binary_name": "u-boot-omap",
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
          },
          {
            "binary_name": "u-boot-qcom",
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
          },
          {
            "binary_name": "u-boot-qemu",
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
          },
          {
            "binary_name": "u-boot-rockchip",
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
          },
          {
            "binary_name": "u-boot-rpi",
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
          },
          {
            "binary_name": "u-boot-sunxi",
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
          },
          {
            "binary_name": "u-boot-tegra",
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
          },
          {
            "binary_name": "u-boot-tools",
            "binary_version": "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "u-boot",
        "purl": "pkg:deb/ubuntu/u-boot@2020.10+dfsg-1ubuntu0~18.04.3+esm2?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2016.03+dfsg1-6ubuntu2",
        "2018.07~rc3+dfsg1-0ubuntu1~18.04.1",
        "2018.07~rc3+dfsg1-0ubuntu2~18.04.1",
        "2018.07~rc3+dfsg1-0ubuntu3~18.04.1",
        "2019.07+dfsg-1ubuntu4~18.04.1",
        "2020.10+dfsg-1ubuntu0~18.04.2",
        "2020.10+dfsg-1ubuntu0~18.04.3",
        "2020.10+dfsg-1ubuntu0~18.04.3+esm1",
        "2020.10+dfsg-1ubuntu0~18.04.3+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "u-boot",
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6+esm2"
          },
          {
            "binary_name": "u-boot-amlogic",
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6+esm2"
          },
          {
            "binary_name": "u-boot-exynos",
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6+esm2"
          },
          {
            "binary_name": "u-boot-imx",
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6+esm2"
          },
          {
            "binary_name": "u-boot-mvebu",
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6+esm2"
          },
          {
            "binary_name": "u-boot-omap",
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6+esm2"
          },
          {
            "binary_name": "u-boot-qcom",
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6+esm2"
          },
          {
            "binary_name": "u-boot-qemu",
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6+esm2"
          },
          {
            "binary_name": "u-boot-rockchip",
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6+esm2"
          },
          {
            "binary_name": "u-boot-rpi",
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6+esm2"
          },
          {
            "binary_name": "u-boot-sifive",
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6+esm2"
          },
          {
            "binary_name": "u-boot-sunxi",
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6+esm2"
          },
          {
            "binary_name": "u-boot-tegra",
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6+esm2"
          },
          {
            "binary_name": "u-boot-tools",
            "binary_version": "2021.01+dfsg-3ubuntu0~20.04.6+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "u-boot",
        "purl": "pkg:deb/ubuntu/u-boot@2021.01+dfsg-3ubuntu0~20.04.6+esm2?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2019.07+dfsg-1ubuntu3",
        "2019.07+dfsg-1ubuntu5",
        "2019.07+dfsg-1ubuntu6",
        "2020.10+dfsg-1ubuntu0~20.04.2",
        "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",
        "2021.01+dfsg-3ubuntu0~20.04.6+esm1",
        "2021.01+dfsg-3ubuntu0~20.04.6+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "u-boot",
            "binary_version": "2022.01+dfsg-2ubuntu2.9"
          },
          {
            "binary_name": "u-boot-amlogic",
            "binary_version": "2022.01+dfsg-2ubuntu2.9"
          },
          {
            "binary_name": "u-boot-exynos",
            "binary_version": "2022.01+dfsg-2ubuntu2.9"
          },
          {
            "binary_name": "u-boot-imx",
            "binary_version": "2022.01+dfsg-2ubuntu2.9"
          },
          {
            "binary_name": "u-boot-microchip",
            "binary_version": "2022.01+dfsg-2ubuntu2.9"
          },
          {
            "binary_name": "u-boot-mvebu",
            "binary_version": "2022.01+dfsg-2ubuntu2.9"
          },
          {
            "binary_name": "u-boot-omap",
            "binary_version": "2022.01+dfsg-2ubuntu2.9"
          },
          {
            "binary_name": "u-boot-qcom",
            "binary_version": "2022.01+dfsg-2ubuntu2.9"
          },
          {
            "binary_name": "u-boot-qemu",
            "binary_version": "2022.01+dfsg-2ubuntu2.9"
          },
          {
            "binary_name": "u-boot-rockchip",
            "binary_version": "2022.01+dfsg-2ubuntu2.9"
          },
          {
            "binary_name": "u-boot-rpi",
            "binary_version": "2022.01+dfsg-2ubuntu2.9"
          },
          {
            "binary_name": "u-boot-sifive",
            "binary_version": "2022.01+dfsg-2ubuntu2.9"
          },
          {
            "binary_name": "u-boot-sunxi",
            "binary_version": "2022.01+dfsg-2ubuntu2.9"
          },
          {
            "binary_name": "u-boot-tegra",
            "binary_version": "2022.01+dfsg-2ubuntu2.9"
          },
          {
            "binary_name": "u-boot-tools",
            "binary_version": "2022.01+dfsg-2ubuntu2.9"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "u-boot",
        "purl": "pkg:deb/ubuntu/u-boot@2022.01+dfsg-2ubuntu2.9?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2021.07+dfsg-0ubuntu8",
        "2021.07+dfsg-0ubuntu9",
        "2021.07+dfsg-0ubuntu10",
        "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",
        "2022.01+dfsg-2ubuntu2.8",
        "2022.01+dfsg-2ubuntu2.9"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "u-boot-nezha",
            "binary_version": "2022.04+git20220405.7446a472-0ubuntu0.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "u-boot-nezha",
        "purl": "pkg:deb/ubuntu/u-boot-nezha@2022.04+git20220405.7446a472-0ubuntu0.4?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2021.09+git20211008.62392d3-0ubuntu1",
        "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_name": "u-boot-amlogic",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-amlogic-binaries",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-asahi",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-exynos",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-exynos-binaries",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-imx",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-microchip",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-mvebu",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-omap",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-qcom",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-qemu",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-rockchip",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-rpi",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-sifive",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-sitara-binaries",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-starfive",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-stm32",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-sunxi",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-tegra",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          },
          {
            "binary_name": "u-boot-tools",
            "binary_version": "2025.10-0ubuntu0.24.04.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "u-boot",
        "purl": "pkg:deb/ubuntu/u-boot@2025.10-0ubuntu0.24.04.4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2023.07+dfsg-1ubuntu2",
        "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",
        "2025.01-0ubuntu0.24.04.1",
        "2025.01-0ubuntu0.24.04.2",
        "2025.10-0ubuntu0.24.04.1",
        "2025.10-0ubuntu0.24.04.2",
        "2025.10-0ubuntu0.24.04.3",
        "2025.10-0ubuntu0.24.04.4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "u-boot-nezha",
            "binary_version": "2024.01~rc1-190-g2e89b706f5-0ubuntu2.24.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "u-boot-nezha",
        "purl": "pkg:deb/ubuntu/u-boot-nezha@2024.01~rc1-190-g2e89b706f5-0ubuntu2.24.04.2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2022.10-1089-g528ae9bc6c-0ubuntu2",
        "2024.01~rc1-190-g2e89b706f5-0ubuntu1",
        "2024.01~rc1-190-g2e89b706f5-0ubuntu2",
        "2024.01~rc1-190-g2e89b706f5-0ubuntu2.24.04.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "u-boot-amlogic",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-amlogic-binaries",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-asahi",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-exynos",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-exynos-binaries",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-imx",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-microchip",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-mvebu",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-omap",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-qcom",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-qemu",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-rockchip",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-rpi",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-sifive",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-sitara-binaries",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-starfive",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-stm32",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-sunxi",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-tegra",
            "binary_version": "2025.10-0ubuntu6"
          },
          {
            "binary_name": "u-boot-tools",
            "binary_version": "2025.10-0ubuntu6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "u-boot",
        "purl": "pkg:deb/ubuntu/u-boot@2025.10-0ubuntu6?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2025.10-0ubuntu2",
        "2025.10-0ubuntu3",
        "2025.10-0ubuntu4",
        "2025.10-0ubuntu5",
        "2025.10-0ubuntu6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "u-boot-amlogic",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-amlogic-binaries",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-asahi",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-exynos",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-exynos-binaries",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-imx",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-microchip",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-mvebu",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-omap",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-qcom",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-qemu",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-rockchip",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-rpi",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-sifive",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-sitara-binaries",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-starfive",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-stm32",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-sunxi",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-tegra",
            "binary_version": "2025.10-0ubuntu2.2"
          },
          {
            "binary_name": "u-boot-tools",
            "binary_version": "2025.10-0ubuntu2.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "u-boot",
        "purl": "pkg:deb/ubuntu/u-boot@2025.10-0ubuntu2.2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2025.01-3ubuntu4",
        "2025.10-0ubuntu1",
        "2025.10-0ubuntu2",
        "2025.10-0ubuntu2.1",
        "2025.10-0ubuntu2.2"
      ]
    }
  ],
  "aliases": [],
  "details": "U-Boot before 2026.10-rc4 contains an integer overflow vulnerability in sqfs_read_directory_table() function when allocating the directory table buffer. Attackers can supply a crafted SquashFS image with an attacker-controlled superblock metablks_count value that causes heap buffer under-allocation and out-of-bounds writes, corrupting heap memory and crashing the bootloader.",
  "id": "UBUNTU-CVE-2026-71973",
  "modified": "2026-10-21T20:15:06Z",
  "published": "2026-09-29T22:18:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-71973"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-71973"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/u-boot/u-boot"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/u-boot/u-boot/blob/v2026.07/fs/squashfs/sqfs.c#L814"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/u-boot/u-boot/commit/561ae28cb56a082cfa90c1c421c4955bc215470b"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc4-integer-overflow-in-squashfs-directory-table-allocation"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-71973"
  ]
}

CVE-2026-71973 (GCVE-0-2026-71973)

Vulnerability from cvelistv5 – Published: 2026-09-29 21:29 – Updated: 2026-10-02 12:29

Title

U-Boot before 2026.10-rc4 Integer Overflow in SquashFS Directory Table Allocation

Summary

Severity

5.2 (Medium)


                        
                          CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

5.2 (Medium)


                        
                          CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-02 12:29 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6752 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/u-boot/u-boot/commit/561ae28cb…	patch
https://github.com/u-boot/u-boot/blob/v2026.07/fs…	technical-description
https://github.com/u-boot/u-boot	product
https://www.vulncheck.com/advisories/u-boot-befor…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
u-boot	u-boot	Affected: 0 , < 2026.10-rc4 (custom) cpe:2.3:a:denx:u-boot::::::::

Date Public

2026-07-28 00:00

Credits

Shahriyar Jalayeri (ByteRay Ltd.) Mehrun P. Hunter (ByteRay Ltd.)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-71973",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-02T12:29:06.594431Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-02T12:29:17.608Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/u-boot/u-boot",
          "product": "u-boot",
          "repo": "https://github.com/u-boot/u-boot",
          "vendor": "u-boot",
          "versions": [
            {
              "lessThan": "2026.10-rc4",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:denx:u-boot:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "2026.10-rc4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Shahriyar Jalayeri (ByteRay Ltd.)"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Mehrun P. Hunter (ByteRay Ltd.)"
        }
      ],
      "datePublic": "2026-07-28T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "U-Boot before 2026.10-rc4 contains an integer overflow vulnerability in sqfs_read_directory_table() function when allocating the directory table buffer. Attackers can supply a crafted SquashFS image with an attacker-controlled superblock metablks_count value that causes heap buffer under-allocation and out-of-bounds writes, corrupting heap memory and crashing the bootloader."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "PHYSICAL",
            "baseScore": 5.2,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "PHYSICAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.2,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-190",
              "description": "Integer Overflow or Wraparound",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-29T21:29:21.349Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/u-boot/u-boot/commit/561ae28cb56a082cfa90c1c421c4955bc215470b"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/u-boot/u-boot/blob/v2026.07/fs/squashfs/sqfs.c#L814"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/u-boot/u-boot"
        },
        {
          "name": "VulnCheck Advisory: U-Boot before 2026.10-rc4 Integer Overflow in SquashFS Directory Table Allocation",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc4-integer-overflow-in-squashfs-directory-table-allocation"
        }
      ],
      "title": "U-Boot before 2026.10-rc4 Integer Overflow in SquashFS Directory Table Allocation",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-71973",
    "datePublished": "2026-09-29T21:29:21.349Z",
    "dateReserved": "2026-08-08T16:43:04.178Z",
    "dateUpdated": "2026-10-02T12:29:17.608Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

UBUNTU-CVE-2026-71973 (CVE-2026-71973)

CVE-2026-71973 (GCVE-0-2026-71973)

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour