CVE-2026-23211
Description
A flaw was found in the Linux kernel's memory management swap subsystem. A previous commit marked the swap address space as read-only, but when arch_prepare_to_swap() fails under heavy memory pressure, the kernel attempts to set a writeback error on the read-only mapping. This triggers a kernel panic during memory reclaim operations in the page fault handler path.
Statement
This issue can occur on systems under heavy memory pressure when swap operations fail and the kernel attempts to record the error. The panic occurs in the memory reclaim path, making it potentially triggerable by any workload that causes significant memory pressure. The fix restores the swap address space to read-write to allow error reporting.
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 | 5.5 | 5.5 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Other
Technical Impact: Other; Alter Execution Logic
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