CVE-2026-74221

U-Boot before 2026.10-rc5 Buffer Overflow via NFS READLINK

Published Sep 29, 2026 CVSS 4.0 · 8.8 High EPSS < 1% KEV · Not listed
Description
U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Ubuntu USN Ubuntu USN USN-8930-1 U-Boot vulnerabilities
Ubuntu USN Ubuntu USN USN-8930-2 U-Boot vulnerabilities
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared U-boot
U-boot u-boot
Vendors & Products U-boot
U-boot u-boot
Type Values Removed Values Added
Description U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.
Title U-Boot before 2026.10-rc5 Buffer Overflow via NFS READLINK
First Time appeared Denx
Denx u-boot
Weaknesses CWE-195
CPEs cpe:2.3:a:denx:u-boot:*:*:*:*:*:*:*:*
Vendors & Products Denx
Denx u-boot
References
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H'}

cvssV4_0

{'score': 8.8, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Sep 30, 2026, 1:47 PM
Reserved
Aug 14, 2026, 6:01 PM
Status
Awaiting Analysis
Published
Sep 29, 2026, 10:18 PM
Modified
Sep 30, 2026, 4:40 PM