Linux Kernel Proc File System Pagemap Scan Use-After-Free Local Privilege Escalation Vulnerability
Vulnerability Details
This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
The specific flaw exists within the handling of hugetlb_vma_lock objects. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel.
Additional Details
Linux has issued an update to correct this vulnerability. More details can be found at:
https://github.com/torvalds/linux/commit/4fb975471717c953f912776bb60301add1ffae11
Disclosure Timeline
- 2026-09-15 - Vulnerability reported to vendor
- 2026-11-13 - Coordinated public release of advisory
- 2026-11-13 - Advisory Updated
Credit
parkjunhyun
