SB20260816534 - Use-after-free in Linux kernel netfilter ipvs
Published: August 16, 2026
Security Bulletin ID
SB20260816534
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-68476)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in __ip_vs_get_out_rt() handling of skb head reallocation in net/netfilter/ipvs/ip_vs_xmit.c when processing packets in ip_vs_bypass_xmit(). A local user can trigger skb head reallocation and subsequent use of a stale IP header pointer to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/3fb7edd2018bb1ad0a68157383d9b9dac33dd645
- https://git.kernel.org/stable/c/a2f57827bf7c695b8c72dc4511cae8e86582369d
- https://git.kernel.org/stable/c/ac6ac3d35bfc0ade9d17d354c84e503a946ebdab
- https://git.kernel.org/stable/c/ad1e14710b360bda087ebf9fb82460eb5ef775de
- https://git.kernel.org/stable/c/e51687fc56c2e39ea6e9532925f1aabd4d529f61