Buffer overflow in U-Boot
CVE-2026-71974
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.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/u-boot/u-boot/commit/35432ef6fe2c79ab72709966e64815a45eb55c76 (patch)
- github.com/u-boot/u-boot/blob/v2026.07/boot/bootmeth_android.c (technical-description)
- patch.msgid.link/20260729-b4-android-bootmeth-oob-v1-1-31c3450ae0be@byteray.co… (mailing-list)
- github.com/u-boot/u-boot (product)
- www.vulncheck.com/advisories/u-boot-before-2026.10-rc3-out-of-bounds-write-via-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-71974?
- CVE-2026-71974 is a medium-severity vulnerability in U-Boot, classified under Out-of-bounds Write. CVSS score: 4.8/10. Published 2026-09-29.
- How severe is CVE-2026-71974?
- Medium severity. CVSS v3 base score is 4.8 out of 10.