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CVE-2021-27138

Publication date 17 February 2021

Last updated 24 July 2024

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

7.8 · High

Score breakdown

The boot loader in Das U-Boot before 2021.04-rc2 mishandles use of unit addresses in a FIT.

Read the notes from the security team

Status

Package Ubuntu Release Status
u-boot 22.10 kinetic
Not affected
22.04 LTS jammy
Not affected
21.10 impish
Not affected
21.04 hirsute Ignored end of life
20.10 groovy Ignored end of life
20.04 LTS focal Ignored
18.04 LTS bionic Ignored
16.04 LTS xenial Ignored
14.04 LTS trusty Not in release

Notes

mdeslaur

This fix changes behaviour and would introduce regressions in existing installations. We will not be fixing this issue in Ubuntu stable releases. See here for an example: https://lore.kernel.org/lkml/20210409192128.3998606-1-nathan@kernel.org/ https://www.linux4sam.org/bin/view/Linux4SAM/HasherrorwhenbootingFITimage https://github.com/linux4sam/dt-overlay-at91/commit/7ad311899af48efbb43f0e3ac935da5981bd4b2d b6f4c757959f8850e1299a77c8e5713da78e8ec0 is the complete patch set that fixes both CVE-2021-27097 and CVE-2021-27138

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
u-boot

Severity score breakdown

Parameter Value
Base score 7.8 · High
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H