CVE-2026-64452
Description
A flaw was found in the Linux kernel's 6LoWPAN (IPv6 over Low-Power Wireless Personal Area Networks) component. A race condition in the lowpan_nhc_do_uncompression function can lead to a use-after-free vulnerability. This occurs when an NHC (Next Header Compression) descriptor is deallocated while another process attempts to access its name in an error handling path. This flaw could allow an attacker to cause a denial of service or potentially execute arbitrary code.
Statement
A race in the 6LoWPAN NHC uncompression error path can leave lowpan_nhc_do_uncompression using an NHC descriptor after lowpan_nhc_lock has been dropped. A malformed adjacent network packet can reach the path through 6LoWPAN receive processing, while concurrent descriptor unregister can free the matching descriptor before nhc name is printed. For the CVSS the PR:N is used because the packet sender does not need a local account or privileges on the target, but AC:H is used because reliable triggering depends on a narrow race with descriptor unregister or module teardown. The issue is adjacent network reachable rather than Internet reachable in typical Bluetooth or IEEE 802.15.4 6LoWPAN deployments. Impact is at least denial of service via kernel crash or KASAN detected use-after-free. The observed primitive is UAF read, so limited confidentiality or integrity impact is kept for review sensitivity, but full privilege escalation is not strongly supported by the diff alone.
Mitigation
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
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 | 5.4 | N/A | 7.1 |
| Attack Vector | Adjacent Network | N/A | Adjacent Network |
| Attack Complexity | High | N/A | High |
| Privileges Required | None | N/A | None |
| User Interaction | Required | N/A | Required |
| 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:A/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:H
cve.org: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
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