CVE-2026-74221

Summary

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.

Affected Software

Weaknesses

• CWE-195: Signed to Unsigned Conversion Error

References

• https://github.com/u-boot/u-boot/commit/1c0aff3a5fbfeee7a8948f624e0b8554e6e0d8fd
• https://github.com/u-boot/u-boot/blob/v2026.07/net/nfs-common.c#L643
• https://github.com/u-boot/u-boot
• https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-buffer-overflow-via-nfs-readlink

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