Use After Free in U-Boot
CVE-2026-74222
U-Boot before 2026.10-rc5 contains a use-after-free vulnerability in the httpc_recv_cb() function within the lwIP wget implementation. When HTTP data storage fails, the callback frees the connection PCB but returns ERR_BUF instead of ERR_ABRT, causing the TCP input path to access released memory and crash the bootloader.
Vulnerability class: Use-After-Free
Published .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/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/2d94618a58aeb7630f18eee33419ce48d0fd3616 (patch)
- github.com/u-boot/u-boot/blob/v2026.07/net/lwip/wget.c (technical-description)
- github.com/u-boot/u-boot (product)
- www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-use-after-free-in-lwip-w… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-74222?
- CVE-2026-74222 is a high-severity vulnerability in U-Boot, classified under Use After Free. CVSS score: 8.2/10. Published 2026-09-29.
- How severe is CVE-2026-74222?
- High severity. CVSS v3 base score is 8.2 out of 10.