Vulnerability DatabaseCVE-2026-74220
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CVE-2026-74220
Published:September 29, 2026
Updated:October 09, 2026
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.
Related Resources (6)
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://nvd.nist.gov/vuln/detail/CVE-2026-74220
https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-buffer-overflow-via-nfs-read-reply
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74220.json
https://github.com/u-boot/u-boot
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CVSS v4
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
HIGH
Weakness Type (CWE)
Signed to Unsigned Conversion Error
CWE-195
EPSS
Base Score:
0.34