CVE-2026-31570
Description
A flaw was found in the Linux kernel's Controller Area Network (CAN) gateway module. An attacker with CAP_NET_ADMIN capabilities could exploit an out-of-bounds heap access vulnerability in the cgw_csum_crc8_rel() function. This flaw occurs due to incorrect index handling, where raw negative indices are used instead of properly calculated bounds-safe indices. Successful exploitation could lead to memory corruption, potentially resulting in a denial of service or information disclosure.
Statement
The CAN gateway CRC helper could index past heap metadata for certain relative checksum modes under CAP_NET_ADMIN. Red Hat treats this as a local network-admin attack surface on systems using CAN gateway rules. Install corrected kernels; unloading can-gw removes the feature where policy allows.
Mitigation
To mitigate this issue, prevent the can-gw module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.
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 | 6.1 | N/A | 8.8 |
| Attack Vector | Local | N/A | Adjacent Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | High |
| Integrity Impact | None | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
cve.org: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Other
Technical Impact: Varies by Context
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