SB2026100783 - Use-after-free in Linux kernel netlink
Published: October 7, 2026
Security Bulletin ID
SB2026100783
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-98284)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to use-after-free and an out-of-bounds read in netlink group bitmap handling when reallocating group bitmaps concurrently with lockless reads. A local user can request netlink diagnostic dumps during group bitmap reallocation to disclose sensitive information.
Remediation
Install update from vendor's website.