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Fencer Vulns
critical 9.0

CVE-2026-15390 json

Out-of-bounds write in Das U-Boot

published 2026-09-29 41 d ago modified 2026-09-30 39 d ago also EUVD-2026-88699

cvss
9.0
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 9%
public exploits
0
none known

Summary

Das U-Boot with CONFIG_IP_DEFRAG=y parameter fails to clear IP reassembly state after delivering a complete datagram. An attacker who can deliver fragmented IP traffic can execute arbitrary code by sending duplicated last-fragment IP packets.

This issue was fixed in commit b1aec609bb5e0d08c25c888c91935287ab4ee5fa in version 2026.07.

Patch / fix

  • DENX Software Engineering Das U-Boot commit b1aec609bb5e0d08c25c888c91935287ab4ee5fa
  • u-boot Ubuntu 22.04 LTS 2022.01+dfsg-2ubuntu2.8
  • u-boot Ubuntu 24.04 LTS 2025.10-0ubuntu0.24.04.3
  • u-boot Ubuntu 26.10 2025.10-0ubuntu5
  • u-boot Ubuntu 26.04 LTS 2025.10-0ubuntu2.1
  • u-boot Ubuntu Pro 16.04 LTS 2016.01+dfsg1-2ubuntu5+esm1
  • u-boot Ubuntu Pro 18.04 LTS 2020.10+dfsg-1ubuntu0~18.04.3+esm1
  • u-boot Ubuntu Pro 20.04 LTS 2021.01+dfsg-3ubuntu0~20.04.6+esm1

ubuntu advisories UBUNTU-CVE-2026-15390

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
no
Technical impact
total
Assessed
41 d ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 9.0 CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CNA 4.0 9.0 CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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

  • DENX Software Engineering Das U-Boot

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.