SB20260720441 - Use-after-free in Linux kernel mac802154

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Main Vulnerability Database SB20260720441

SB20260720441 - Use-after-free in Linux kernel mac802154

Published: July 20, 2026

Security Bulletin ID SB20260720441
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-63831)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service or corrupt data.

The vulnerability exists due to use-after-free in the mac802154 llsec crypto processing in net/mac802154/llsec.c when performing in-place cryptographic transformations on shared skb data. A local user can trigger concurrent 802.15.4 traffic with security enabled to cause a denial of service or corrupt data.

The issue can affect both RX and TX paths when skb data buffers are shared across clones.


Remediation

Install update from vendor's website.

References