CVE-2026-74221 U-Boot - Buffer Overflow

U-Boot before 2026.10-rc5 contains a buffer overflow caused by improper handling of crafted READLINK replies with negative or oversized symlink length values in nfs_readlink_reply() function, letting malicious NFS servers corrupt memory and crash the bootloader, exploit requires interaction with a malicious NFS server.

CVSS base score 8.2 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.34% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Published
29 September 2026
Updated
15 October 2026
Weakness
CWE-195

Vendor fix

Update to version 2026.10-rc5 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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