CVE-2026-74220
U-Boot before 2026.10-rc5 Buffer Overflow via NFS READ Reply
- State
- Published
- Severity
- 8.8 High
- Published
- Sep 29, 2026
- Updated
- Sep 30, 2026
- Reserved
- Aug 14, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.8 High | 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 | VulnCheck |
| 3.1 | 8.2 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H | VulnCheck |
Weaknesses
- CWE-195 Signed to Unsigned Conversion Error
Affected Products
| Product | Versions |
|---|---|
u-bootu-boot |
|
References
- https://github.com/u-boot/u-boot/commit/0bbf09859658b8cc9ac13be41af23b516b8ef69apatch
- https://github.com/u-boot/u-boot/blob/v2026.07/net/nfs-common.c#L695technical-description
- https://github.com/u-boot/u-bootproduct
- VulnCheck Advisory: U-Boot before 2026.10-rc5 Buffer Overflow via NFS READ Replythird-party-advisory
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