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CVE-2026-29009— U-Boot < 2026.07-rc2 Buffer Overflow in nfs_readlink_reply() via NFS READLINK

Quick assessment

Affected
u-boot u-boot
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

U-Boot U-Boot是U-Boot社区开源的一个免费、开源且可扩展的引导加载程序，适用于多种架构（ARM、MIPS、PowerPC、RISC-V、x86、x86_64），其目的是执行各种硬件初始化任务并启动设备的操作系统内核。 U-Boot 2026.04-rc3及之前版本存在缓冲区错误漏洞，该漏洞源于nfs_readlink_reply()函数存在缓冲区溢出，允许恶意或受攻击的NFS服务器通过返回多个相对符号链接目标（每个约1100字节）溢出2048字节的nfs_path_buff缓冲区，导致内存

CVSS 8.2 · High EPSS 0.56% · P44

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
u-boot u-boot < 2026.07-rc2 affected
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I. Basic Information for CVE-2026-29009

Vulnerability Information
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Vulnerability Title
U-Boot < 2026.07-rc2 Buffer Overflow in nfs_readlink_reply() via NFS READLINK
Source: CVE Program / CVE List V5
Vulnerability Description
U-Boot before 2026.07-rc2 contains a buffer overflow vulnerability in nfs_readlink_reply() (net/nfs-common.c) when CONFIG_CMD_NFS is enabled, allowing a malicious or compromised NFS server to overflow the 2048-byte nfs_path_buff buffer by returning multiple relative symlink targets that are appended without cumulative length validation. Attackers can send two or more READLINK responses containing relative symlink targets of approximately 1100 bytes each to corrupt adjacent BSS variables including nfs_server_ip, nfs_server_mount_port, nfs_server_port, nfs_our_port, nfs_state, and rpc_id, potentially achieving memory corruption and control over the NFS client state machine.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
U-Boot 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
U-Boot U-Boot是U-Boot社区开源的一个免费、开源且可扩展的引导加载程序，适用于多种架构（ARM、MIPS、PowerPC、RISC-V、x86、x86_64），其目的是执行各种硬件初始化任务并启动设备的操作系统内核。 U-Boot 2026.04-rc3及之前版本存在缓冲区错误漏洞，该漏洞源于nfs_readlink_reply()函数存在缓冲区溢出，允许恶意或受攻击的NFS服务器通过返回多个相对符号链接目标（每个约1100字节）溢出2048字节的nfs_path_buff缓冲区，导致内存
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
u-boot u-boot 0 ~ 2026.07-rc2 -

II. Public POCs for CVE-2026-29009

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III. Intelligence Information for CVE-2026-29009

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Patches & Fixes for CVE-2026-29009 (1)

Vendor Advisories for CVE-2026-29009 (1)

Mailing List Discussions for CVE-2026-29009 (1)

Security Blog Posts for CVE-2026-29009 (1)

Vendor Pages for CVE-2026-29009 (2)

Same Patch Batch · u-boot · 2026-07-08 · 3 CVEs total

CVE-2026-29008 7.5 HIGH U-Boot 2026.04-rc3 Integer Underflow DoS via tcp_rx_state_machine()
CVE-2026-29007 5.3 MEDIUM U-Boot 2026.04-rc3 Out-of-Bounds Read in tcp_rx_state_machine via tcp.c

IV. Related Vulnerabilities

Same product: u-boot
Same vendor: u-boot
Same weakness: CWE-120

V. Comments for CVE-2026-29009

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