CVE-2026-23288 Overview
A memory corruption vulnerability has been discovered in the Linux kernel's AMD XDNA accelerator driver (accel/amdxdna). The vulnerability exists in the command slot handling functionality where an out-of-bounds memset() operation can occur when the remaining space in a command slot is smaller than the size of the command header. This can lead to memory corruption when the command header is cleared before validating the available slot space.
Critical Impact
Exploitation of this vulnerability could result in memory corruption, potentially leading to system instability, denial of service, or in certain scenarios, privilege escalation if the corrupted memory is leveraged by an attacker.
Affected Products
- Linux kernel with AMD XDNA accelerator driver (accel/amdxdna)
- Systems utilizing AMD XDNA hardware acceleration
Discovery Timeline
- 2026-03-25 - CVE-2026-23288 published to NVD
- 2026-03-25 - Last updated in NVD database
Technical Details for CVE-2026-23288
Vulnerability Analysis
This vulnerability is classified as an Out-of-Bounds Write affecting the AMD XDNA accelerator driver in the Linux kernel. The flaw occurs in the command slot handling code where a memset() function call is executed to clear the command header before performing proper bounds checking on the available slot space.
When a command slot has remaining space that is smaller than the expected command header size, the memset() operation writes beyond the allocated buffer boundaries. This out-of-bounds write can corrupt adjacent memory regions, potentially affecting other kernel data structures or control flow mechanisms.
The vulnerability affects systems with AMD XDNA hardware acceleration enabled, particularly those using the accel/amdxdna driver module. The memory corruption resulting from this flaw could manifest as kernel panics, unexpected system behavior, or could potentially be leveraged for more sophisticated attacks depending on what data structures are adjacent to the corrupted memory region.
Root Cause
The root cause of this vulnerability is improper ordering of memory operations in the command slot handling code. The memset() function call that clears the command header was positioned before the size validation check that ensures sufficient space exists in the command slot. This race between memory clearing and bounds checking allows the memset() to write beyond the valid memory boundaries when the slot space is insufficient.
Attack Vector
The attack vector for this vulnerability involves triggering the vulnerable code path in the AMD XDNA driver through command slot operations. An attacker with local access to a system with the affected driver loaded could potentially craft malicious input that causes the driver to process command slots with insufficient remaining space, triggering the out-of-bounds write condition.
The vulnerability requires local access to the system and the ability to interact with the AMD XDNA driver interface. While the attack complexity may vary depending on system configuration, successful exploitation could lead to kernel memory corruption with consequences ranging from denial of service to potential privilege escalation.
The fix involves relocating the memset() call to execute after the size validation logic, ensuring that the clearing operation only occurs when sufficient space has been confirmed. For detailed implementation, refer to the Linux Kernel Git commits.
Detection Methods for CVE-2026-23288
Indicators of Compromise
- Unexpected kernel panics or system crashes related to the amdxdna driver module
- Memory corruption warnings or errors in kernel logs referencing the AMD XDNA subsystem
- Anomalous behavior in applications utilizing AMD XDNA hardware acceleration
Detection Strategies
- Monitor kernel logs (dmesg) for memory-related errors associated with the accel/amdxdna driver
- Implement kernel memory debugging tools such as KASAN (Kernel Address Sanitizer) to detect out-of-bounds memory access
- Deploy runtime integrity monitoring to detect unexpected modifications to kernel memory regions
Monitoring Recommendations
- Enable kernel auditing for driver module operations and memory allocation events
- Configure alerting for kernel oops or panic events specifically involving AMD XDNA driver components
- Implement continuous monitoring of system stability metrics on systems with AMD XDNA hardware
How to Mitigate CVE-2026-23288
Immediate Actions Required
- Update the Linux kernel to a patched version that includes the fix for this vulnerability
- If immediate patching is not possible, consider temporarily disabling or unloading the amdxdna driver module if AMD XDNA functionality is not critical
- Monitor affected systems for signs of instability or exploitation attempts
Patch Information
The Linux kernel maintainers have released patches that fix this vulnerability by moving the memset() call after the size validation check. The fix ensures that the command header clearing operation only occurs when sufficient space in the command slot has been verified.
Patches are available through the following kernel commits:
System administrators should update to a kernel version containing these patches as soon as possible.
Workarounds
- Disable the amdxdna driver module by adding it to the kernel module blacklist if AMD XDNA acceleration is not required
- Restrict local access to the system to trusted users only, limiting potential attack surface
- Apply kernel hardening measures such as KASLR and stack protections to reduce exploitation impact
# Temporarily disable amdxdna driver module
sudo modprobe -r amdxdna
# Blacklist the driver to prevent automatic loading
echo "blacklist amdxdna" | sudo tee /etc/modprobe.d/blacklist-amdxdna.conf
# Verify the module is not loaded
lsmod | grep amdxdna
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
