CVE-2026-74220: high-severity vulnerability in u-boot
U-Boot before 2026.10-rc5 Buffer Overflow via NFS READ Reply
Published · Updated
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.8epss 0.3%
exploitation probability
0.3%top 75% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
Affected products
u-boot · u-bootRelated CVEs — u-boot
In the same product, most dangerous first.
CVE-2026-29009HIGHU-Boot < 2026.07-rc2 Buffer Overflow in nfs_readlink_reply() via NFS READLINKEPSS 0.7%CVE-2026-29008HIGHU-Boot 2026.04-rc3 Integer Underflow DoS via tcp_rx_state_machine()EPSS 0.7%CVE-2026-29007MEDIUMU-Boot 2026.04-rc3 Out-of-Bounds Read in tcp_rx_state_machine via tcp.cEPSS 0.7%CVE-2026-71971HIGHU-Boot before 2026.10-rc3 Out-of-Bounds Write in IP Fragment ReassemblyEPSS 0.4%CVE-2026-74221HIGHU-Boot before 2026.10-rc5 Buffer Overflow via NFS READLINKEPSS 0.3%CVE-2026-74222HIGHU-Boot before 2026.10-rc5 Use-After-Free in lwIP wget Receive CallbackEPSS 0.3%