CVE-2022-3565
Description
A use-after-free flaw was found in the Linux kernel’s ISDN over IP tunnel functionality in how a local user triggers the release_card() function called from l1oip_cleanup(). This flaw allows a local user to crash or potentially escalate their privileges on the system.
Mitigation
To mitigate this issue, prevent the l1oip module from being loaded. Please see https://access.redhat.com/solutions/41278 for information on how to blacklist a kernel module to prevent it from loading automatically.
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).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7 | 7.8 | 4.6 |
| Attack Vector | Local | Local | Adjacent Network |
| Attack Complexity | High | Low | High |
| Privileges Required | Low | Low | Low |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | High | High | Low |
| Integrity Impact | High | High | Low |
| Availability Impact | High | High | Low |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/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
cve.org: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Red Hat CVSS v3 Score Explanation
Fail happens when some hardware detached, but not because of remote user activity, so AV:L. Fail happens in release_card() being called from the l1oip_cleanup(). This is driver for ISDN and fail cannot happen before "card" (or some other hardware) exists for ISDN, because l1oip_cleanup could be called only after init_card() happened.
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