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.
References
| Link | Resource |
|---|---|
| https://git.u-boot-project.org/u-boot/u-boot/-/commit/d6694018eaddefac6aae974f9cec72fd6e58f1bc | |
| https://git.u-boot-project.org/u-boot/u-boot/-/releases/v2026.07-rc2 | |
| https://lists.denx.de/pipermail/u-boot/2026-May/617853.html | Mailing List Third Party Advisory |
| https://u-boot.org/ | Product |
| https://www.vulncheck.com/advisories/u-boot-rc3-buffer-overflow-in-nfs-readlink-reply-via-nfs-readlink | Exploit Third Party Advisory |
| https://y637f9qq2x.com/posts/u-boot-tcp-nfs-vulns/ | Exploit Third Party Advisory |
Configurations
Configuration 1 (hide)
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History
24 Jul 2026, 18:16
| Type | Values Removed | Values Added |
|---|---|---|
| References |
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| References | () https://www.vulncheck.com/advisories/u-boot-rc3-buffer-overflow-in-nfs-readlink-reply-via-nfs-readlink - Exploit, Third Party Advisory | |
| References | () https://y637f9qq2x.com/posts/u-boot-tcp-nfs-vulns/ - Exploit, Third Party Advisory | |
| Summary | (en) 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. |
22 Jul 2026, 18:34
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Denx
Denx u-boot |
|
| References | () https://lists.denx.de/pipermail/u-boot/2026-May/617853.html - Mailing List, Third Party Advisory | |
| References | () https://u-boot.org/ - Product | |
| References | () https://www.vulncheck.com/advisories/u-boot-rc3-buffer-overflow-in-nfs-readlink-reply-via-nfs-readlink - Third Party Advisory, Exploit | |
| References | () https://y637f9qq2x.com/posts/u-boot-tcp-nfs-vulns/ - Third Party Advisory, Exploit | |
| CPE | cpe:2.3:a:denx:u-boot:2026.04:rc3:*:*:*:*:*:* cpe:2.3:a:denx:u-boot:2026.04:rc1:*:*:*:*:*:* cpe:2.3:a:denx:u-boot:*:*:*:*:*:*:*:* cpe:2.3:a:denx:u-boot:2026.04:rc2:*:*:*:*:*:* |
13 Jul 2026, 19:17
| Type | Values Removed | Values Added |
|---|---|---|
| References |
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08 Jul 2026, 17:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-07-08 17:17
Updated : 2026-07-24 18:16
NVD link : CVE-2026-29009
Mitre link : CVE-2026-29009
CVE.ORG link : CVE-2026-29009
JSON object : View
Products Affected
denx
- u-boot
CWE
CWE-120
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')