SB2026100664 - Use-after-free in Linux kernel ipv6
Published: October 6, 2026
Security Bulletin ID
SB2026100664
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-98368)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a use-after-free of zerocopy pages.
The vulnerability exists due to incorrect page reference counting in the ESP output path and esp_ssg_unref() when processing out-of-place output containing zerocopy managed fragments. A local user can trigger this processing to cause a use-after-free of zerocopy pages.
The affected pages remain pinned while their reference counts fall below the GUP pin bias.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/0d0845ee61c5df47cc68bc446501f48f71e8dcc6
- https://git.kernel.org/stable/c/2359264f377cdbdef2d95868cc8fb572949e48d3
- https://git.kernel.org/stable/c/6508304ac2c8cdafca2f4ab915df8c707893e134
- https://git.kernel.org/stable/c/69a768c12398cada8528080332c822623fa7064d
- https://git.kernel.org/stable/c/6cab554f2c0f28773f712ed3a5479103f42ce844
- https://git.kernel.org/stable/c/f89416eb3db151170a6f3c6dfc5239d26cdce4d2