CVE-2026-74220

Summary

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 Software

Weaknesses

• CWE-195: Signed to Unsigned Conversion Error

References

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

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