What’s Vulnerable › Vulnerabilities

CVE-2026-74220: U-Boot before 2026.10-rc5 Buffer Overflow via NFS READ Reply

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-29 · updated 2026-09-30
• Weakness: CWE-195

Description

U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_read_reply() function in net/nfs-common.c that allows attackers to corrupt memory by supplying crafted NFS READ reply lengths. A malicious NFS server can exploit signed integer handling to bypass length validation and write far past the destination buffer, crashing the bootloader or corrupting memory.

Affected products

• u-boot: before 2026.10-rc5 — fixed in 2026.10-rc5

How to fix

Upgrade to a fixed version: u-boot 2026.10-rc5. Check the vendor advisory for mitigations.

References

• https://github.com/u-boot/u-boot
• https://github.com/u-boot/u-boot/blob/v2026.07/net/nfs-common.c#L695
• https://github.com/u-boot/u-boot/commit/0bbf09859658b8cc9ac13be41af23b516b8ef69a
• https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-buffer-overflow-via-nfs-read-reply

Get alerted when CVE-2026-74220 or the next vulnerability affects your stack