Medium6.5Red Hat Linux Updated
Denial of Service via IPv6 Router Advertisement memory leak
CVE-2026-56116 Published Jun 23, 2026Updated by vendor Jun 23, 2026
Affected products & platforms
Red Hat LinuxUnclassified
Summary
Denial of Service via IPv6 Router Advertisement memory leak. Red Hat rates this moderate (CVSS 6.5). Weakness: CWE-772.
Mitigation checklist
Recommended fix / mitigation
- To mitigate this issue, consider disabling IPv6 on systems where it is not required. This can be achieved temporarily by running `sudo sysctl -w net.ipv6.conf.all.disable_ipv6=1` and `sudo sysctl -w net.ipv6.conf.default.disable_ipv6=1`. For permanent disablement, add `net.ipv6.conf.all.disable_ipv6 = 1` and `net.ipv6.conf.default.disable_ipv6 = 1` to a file like `/etc/sysctl.d/99-disable-ipv6.conf` and apply with `sudo sysctl -p`. Disabling IPv6 may impact network functionality that relies on it. A system restart or network service reload may be required for changes to take effect.
Official advisory · high-confidence parse· fetched 7 hours ago·verify at source
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