Description
U-Boot before 2026.10-rc3 contains an out-of-bounds write vulnerability in read_slotted_partition() that fails to validate image size against partition bounds. Attackers with physical access can supply crafted boot media with oversized headers to write past the load buffer into bootloader memory on devices without Android Verified Boot protection.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| u-boot | u-boot | < 2026.10-rc3 | 2026.10-rc3 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | u-boot | No fix yet | — |
| Ubuntu 26.04 LTS | u-boot | No fix yet | — |
| Ubuntu 24.04 LTS | u-boot +1 | No fix yet | — |
| Ubuntu 22.04 LTS | u-boot +1 | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | u-boot | No fix yet | — |
| Ubuntu Pro 18.04 LTS | u-boot | No fix yet | — |
| Ubuntu Pro 16.04 LTS | u-boot | No fix yet | — |
Advisories 1
- WID-SEC-2026-3660 DENX U-Boot: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 21, 2026
References
- https://github.com/u-boot/u-boot/commit/35432ef6fe2c79ab72709966e64815a45eb55c76 patch
- https://github.com/u-boot/u-boot/blob/v2026.07/boot/bootmeth_android.c#L356 technical-description
- https://patch.msgid.link/20260729-b4-android-bootmeth-oob-v1-1-31c3450ae0be@byteray.co.uk mailing-list
- https://github.com/u-boot/u-boot product
- VulnCheck Advisory: U-Boot before 2026.10-rc3 Out-of-Bounds Write via Android Bootmeth Partition Read third-party-advisory