CVE-2026-72253
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_sip: validate skb_dst() before accessing it tc ingress and openvswitch do not guarantee routing information to be available. These subsystems use the conntrack helper infrastructure, and the SIP helper relies on the skb_dst() to be present if sip_external_media is set to 1 (which is disabled by default as a module parameter). This effectively disables the sip_external_media toggle for these subsystems without resulting in a crash.
Affected versions
Linux kernel versions
4.3
and later are affected. Fixed in
6.6.148,
6.12.101,
6.18.42,
7.1.5,
7.2-rc2
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-72253?
CVE-2026-72253 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.3 onward and has been patched in 6.6.148, 6.12.101, 6.18.42 and others. CVE-2026-72253 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-72253?
Yes. CVE-2026-72253 has been patched. Fixed versions include 6.6.148, 6.12.101, 6.18.42 and others. If you are running Linux kernel 4.3 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-72253 actively exploited?
No. CVE-2026-72253 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.