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Vulnerability · Published Sep 29, 2026 · Assigned by VulnCheck

CVE-2026-74222U-Boot before 2026.10-rc5 Use-After-Free in lwIP wget Receive Callback

High 8.2

In plain English

A high-severity use-after-free in u-boot from u-boot. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.2High
Exploit odds (30 days)0.3%top 77.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Ubuntu:22.04:LTSu-boot2022.01+dfsg-2ubuntu2.9USN-8930-1
Ubuntu:24.04:LTSu-boot2025.10-0ubuntu0.24.04.4USN-8930-1
Ubuntu:24.04:LTSu-boot2025.10-0ubuntu0.24.04.4UBUNTU-CVE-2026-74222
Ubuntu:26.04:LTSu-boot2025.10-0ubuntu2.2USN-8930-1
Ubuntu:26.04:LTSu-boot2025.10-0ubuntu2.2UBUNTU-CVE-2026-74222
Ubuntu:26.10u-boot2025.10-0ubuntu6USN-8930-2
Ubuntu:26.10u-boot2025.10-0ubuntu6UBUNTU-CVE-2026-74222
Ubuntu:22.04:LTSu-boot-nezhano fix listedUBUNTU-CVE-2026-74222
Ubuntu:24.04:LTSu-boot-nezhano fix listedUBUNTU-CVE-2026-74222

Affected products (as reported)

VendorProductVersions
u-boot u-boot 0 – before 2026.10-rc5

Weakness: CWE-416 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

References