8.8

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

Awaiting analysis
AliasesUBUNTU-CVE-2026-74222
Published 29-09-2026Last modified 02-10-2026

Vulnerability summary

CVE-2026-74222 is a high (CVSS 8.8) Use After Free vulnerability in u-boot. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 21.8% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v4.0 (CVE.org)
EPSS score
0.30%
0%100%
Low · Change unavailable
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
USN-8930-1USN-8930-2

Timeline

  1. 29-09-2026
    PublishedVulnerability first disclosed.
  2. 02-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

6 scores · 3 sources · 2 versions

EPSS trend

Probability

0.30%

Chance of exploitation in the next 30 days

Percentile

22%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

30-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu2 products
  • u-bootAll versions (No fix recorded) | < 2025.10-0ubuntu0.24.04.4 | < 2025.10-0ubuntu6 | < 2025.10-0ubuntu2.2
  • u-boot-nezhaAll versions (No fix recorded)
U-boot1 product

2 vendors · 3 products

References

8 links