U-Boot <2026.10-rc5 Buffer Overflow in nfs_read_reply()
CVE-2026-74220 Published on September 29, 2026
U-Boot before 2026.10-rc5 Buffer Overflow via NFS READ Reply
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.
Vulnerability Analysis
CVE-2026-74220 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
Signed to Unsigned Conversion Error
The software uses a signed primitive and performs a cast to an unsigned primitive, which can produce an unexpected value if the value of the signed primitive can not be represented using an unsigned primitive.
Products Associated with CVE-2026-74220
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Affected Versions
u-boot:- Before 2026.10-rc5 is affected.