Vulnerability DatabaseCVE-2026-74221
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CVE-2026-74221
Published:September 29, 2026
Updated:October 09, 2026
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.
Related Resources (6)
https://nvd.nist.gov/vuln/detail/CVE-2026-74221
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74221.json
https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-buffer-overflow-via-nfs-readlink
https://github.com/u-boot/u-boot
https://github.com/u-boot/u-boot/commit/1c0aff3a5fbfeee7a8948f624e0b8554e6e0d8fd
https://github.com/u-boot/u-boot/blob/v2026.07/net/nfs-common.c#L643
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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