Linux Kernel Vulnerability CVE-2024–26582: How a kTLS Flaw Grants Root Shell

Cybersecurity researchers have recently unveiled the weaponization mechanics of CVE-2024–26582, a high-severity vulnerability (CVSS 7.8) hidden deep within the Linux kernel's native Transport Layer Security (net/tls) parsing component. What was initially categorized as a standard Denial of Service (DoS) bug has now evolved into a fully functional Local Privilege Escalation (LPE) exploit that spawns an interactive root shell.

The root cause of this vulnerability lies in a structural desynchronization during asynchronous cryptographic decryption paired with partial read operations. When the kernel processes network data via tls_decrypt_sg, it neglects to acquire an active reference count on the memory pages allocated for the cleartext socket buffer (clear_skb).

As soon as the asynchronous cryptographic worker finishes its routing, the decryption callback natively triggers a put_page() instruction. Because no initial reference count was held to protect the active socket-read operation, this drop brings the page's tracking counter straight to zero. Consequently, the kernel page allocator prematurely reclaims the memory while it is still queued for reading, creating a dangerous Use-After-Free (UAF) condition.

Local unprivileged attackers can systematically exploit this dangling pointer via advanced heap grooming techniques. By spraying the kmalloc heap with customized payloads right after the premature free occurs, adversaries can leak kernel text pointers, completely bypass Kernel Address Space Layout Randomization (KASLR), and execute a targeted write primitive to overwrite critical process credentials (struct cred) to User ID 0.

Understanding the deep memory states, tracing KASAN logs, and studying the technical breakdown of this architecture is critical for modern system engineers and cloud security teams.

I have published a comprehensive, deep-dive technical analysis of this exploit path, complete with KASAN debugging terminal outputs and exploitation breakdown models.

Read the full write-up here: 👉 https://denizhalil.com/2026/07/09/linux-kernel-vulnerability-cve-2024-26582-analysis/