CVE-2026-31686
Description
A flaw was found in the Linux kernel. A double-free vulnerability exists in the Kernel Address Sanitizer (KASAN) component, specifically within the kasan_free_pxd() function. This issue arises because the function incorrectly assumes that page tables are always page-aligned, which is not consistent across all architectures. This can lead to a double-free when memory is deallocated, potentially causing a system crash and resulting in a Denial of Service (DoS).
Statement
This Moderate impact flaw in the Linux kernel's Kernel Address Sanitizer (KASAN) component can lead to a system crash due to a double-free vulnerability. The issue arises from incorrect assumptions about page table alignment across different architectures, potentially resulting in a Denial of Service. This flaw is exploited with a debug enable flag with needs a privileged user to exploit.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.7 | 7.8 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | High | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | High | High | N/A |
| Integrity Impact | High | High | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Integrity,Availability,Confidentiality
Technical Impact: Modify Memory; DoS: Crash, Exit, or Restart; Execute Unauthorized Code or Commands
This weakness may result in the corruption of memory, and perhaps instructions, possibly leading to a crash. If the corrupted memory can be effectively controlled, it may be possible to execute arbitrary code.
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