CVE-2026-23026

What it actually does

A memory leak occurs in the GPI peripheral configuration function when a kernel memory reallocation attempt fails, causing the original allocation pointer to be lost and the memory to become unreachable.

Why it matters to the business

Repeated triggering could gradually exhaust kernel memory, leading to system performance degradation or instability in affected Linux environments; low exploitability reduces urgency despite the kernel-wide impact.

How an attack unfolds

An attacker with local access could attempt to trigger the peripheral configuration path in a way that causes krealloc to fail repeatedly, though exploitation is difficult and requires specific conditions; no known threat actors or ransomware campaigns are associated.

How to fix it

Update the Linux kernel to a version containing commit 4532f18e4ab36def1f55cd936d0fc002b2ce34c2 or later in the stable repository.

How to confirm the fix worked

Inspect kernel source for the use of a temporary variable to hold krealloc results before updating the config pointer, and confirm the commit is present in the running kernel tree.

Typical attack path

1. Obtain local user access to the Linux system
2. Trigger DMA/GPI peripheral configuration paths that invoke the vulnerable reallocation logic
3. Force allocation failure conditions to leak memory references
4. Repeat to accumulate unreleased kernel memory

How to detect it

Review kernel logs and memory accounting for repeated allocation failures or growth in GPI/DMA driver structures; examine crash dumps or slabinfo for unreleased buffers tied to peripheral config.

What your security team should do

• Apply the referenced kernel commit or newer stable version across all affected systems
• Monitor kernel memory usage and DMA driver activity for anomalies
• Prioritize updates in environments with high Linux kernel density or downstream dependents