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A high-severity flaw tracked as CVE-2026-29009 affects U-Boot through 2026.04-rc3 in the nfs_readlink_reply() function within net/nfs-common.c. The vulnerability is present when CONFIG_CMD_NFS is enabled and stems from missing cumulative length validation while appending multiple relative symlink targets returned by an NFS server during READLINK handling.
A malicious or compromised NFS server can trigger the bug by sending two or more READLINK responses with symlink targets of about 1100 bytes each, overflowing the 2048-byte nfs_path_buff buffer. The overflow can corrupt adjacent BSS variables including nfs_server_ip, nfs_server_mount_port, nfs_server_port, nfs_our_port, nfs_state, and rpc_id, creating a path to memory corruption and possible attacker control over the U-Boot NFS client state machine.
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A CVE entry for CVE-2026-29009 was published describing the same U-Boot buffer overflow in nfs_readlink_reply() via NFS READLINK. The entry notes that overflowing the 2048-byte nfs_path_buff buffer can corrupt adjacent BSS variables such as nfs_server_ip, nfs_server_mount_port, nfs_server_port, nfs_our_port, nfs_state, and rpc_id.
VulnCheck published an advisory describing a buffer overflow in U-Boot through version 2026.04-rc3 in nfs_readlink_reply() when CONFIG_CMD_NFS is enabled. The advisory says a malicious or compromised NFS server can trigger the flaw with multiple large relative symlink targets, causing memory corruption and possible control over the NFS client state machine.
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Red Hat resolved **CVE-2024-54456**, a moderate-severity buffer-overflow flaw in the Linux kernel NFS client function `nfs_sysfs_link_rpc_client()`. The function appended an RPC program name of unknown length to a fixed 64-byte buffer using unsafe `strcat()` operations, creating a CWE-120 classic buffer-overflow condition. A local low-privileged attacker could potentially disclose information, corrupt memory, execute unauthorized code or commands, or cause a denial of service; Red Hat rates the issue CVSS 7.1, while NVD and CVE.org score it 7.8. The upstream remediation replaces the unsafe string handling with bounded `strscpy()` and `strncat()` calls. Red Hat issued corrected kernels for RHEL 9 and RHEL 10 and later supplied a fix for RHEL 9.6 Extended Update Support; organizations should apply the applicable kernel advisories and reboot into the updated kernel. Red Hat states that the RHEL 9 `kernel-rt` package will not receive a fix, and RHEL 8 is outside the supported remediation scope.
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**CVE-2023-6610** is an out-of-bounds read in the Linux kernel SMB client’s `smb2_dump_detail` function in `fs/smb/client/smb2ops.c`. A local low-privileged attacker can trigger the flaw without user interaction, potentially causing a system crash or disclosing internal kernel memory. The issue is tracked in the Linux kernel Bugzilla as **218219** and is categorized as CWE-125. Red Hat rated the vulnerability **7.1 CVSS v3.1** and released fixes for affected Red Hat Enterprise Linux 8 and 9 kernel packages, related Extended Update Support releases, Red Hat Virtualization 4 for RHEL 8, and identified affected OpenShift Logging components. Organizations should apply vendor kernel updates; where patching cannot occur immediately, Red Hat recommends preventing the `cifs` kernel module from loading.
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**CVE-2022-24448** affects Linux kernel NFS directory-open handling: an application opening a path on a mounted NFS filesystem with `O_DIRECTORY` could receive an uninitialized file descriptor if the NFS server returned a regular file during lookup, rather than the expected `ENOTDIR` error. The resulting condition can disclose uninitialized kernel data to local, low-privileged users. The upstream NFSv4 fix validates lookup results when `LOOKUP_DIRECTORY` is set and returns `ENOTDIR` for non-directory objects. Red Hat rated the issue **CVSS 3.3 (Low)** and released corrected kernel packages for affected RHEL 8, RHEL 8.6 EUS, RHEL 9, and Red Hat Virtualization 4 on RHEL 8; its RHEL 6 and RHEL 7 kernel variants are marked will not fix.
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