CVE-2026-74222 U-Boot before 2026.10-rc5 Use-After-Free in lwIP wget Receive Callback
A use-after-free in U-Boot's lwIP wget callback causes a crash when HTTP data storage fails, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74222?
CVE-2026-74222 is a high-severity use after free vulnerability in u-boot, published on 29 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-416
Which versions are affected by CVE-2026-74222?
How do I fix CVE-2026-74222?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-74222 being exploited?
There is no known exploitation of CVE-2026-74222 in the wild and no public exploit code.
Sources
Also known as GHSA-fm4f-g9jh-3qfq, UBUNTU-CVE-2026-74222.