CVE-2026-74222 json
U-Boot before 2026.10-rc5 Use-After-Free in lwIP wget Receive Callback
published 2026-09-29 40 d ago modified 2026-10-02 37 d ago also EUVD-2026-89435
- cvss
- 8.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 22%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- u-boot u-boot 2026.10-rc5
- u-boot Ubuntu 24.04 LTS 2025.10-0ubuntu0.24.04.4
- u-boot Ubuntu 26.10 2025.10-0ubuntu6
- u-boot Ubuntu 26.04 LTS 2025.10-0ubuntu2.2
ubuntu advisories UBUNTU-CVE-2026-74222
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 37 d ago
Exploit prediction
0.30% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.8 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N |
| CNA | 3.1 | 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H |
| CNA | 4.0 | 8.8 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- u-boot u-boot
Classification
- Weakness
-
- CWE-416 Use After Free
References
-
github.com
/u-boot/u-boot/commit/2d94618a58aeb7630f18eee33419ce48d0fd3616
patch
-
github.com
/u-boot/u-boot/blob/v2026.07/net/lwip/wget.c#L194
technical-description
-
github.com
/u-boot/u-boot
product
-
vulncheck.com
/advisories/u-boot-before-2026.10-rc5-use-after-free-in-lwip-wget-receive-callback
third-party-advisory
Sources
- CVE List CVE-2026-74222
- NVD CVE-2026-74222
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