CVE-2026-72250

CVE CVE-2026-72250EUVD EUVD-2026-59149Published 2026-08-15T05:54:39.000ZLast changed 2026-08-17T05:42:02.000ZCVSS 7.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_reasm: guard mac_header adjustment after IPv6 defrag nf_ct_frag6_reasm() slides the packet head forward to drop the IPv6 fragment header and then unconditionally advances skb->mac_header: skb->mac_header += sizeof(struct frag_hdr); On the NF_INET_LOCAL_OUT defrag path the skb has no link-layer header yet, so skb->mac_header is still the "not set" sentinel (u16)~0U. Adding sizeof(struct frag_hdr) wraps it to a small value (0xffff + 8 == 7), after which skb_mac_header_was_set() wrongly reports a MAC header is present and skb_mac_header() points into the headroom. The reassembler has done this unconditional add since it was introduced; it was harmless while mac_header was a bare pointer, but wrong once mac_header became a u16 offset whose unset state is the ~0U sentinel tested by skb_mac_header_was_set(). The sibling net/ipv6/reassembly.c does the same relocation and does guard the adjustment; mirror the guard here.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <00bdce2fda7e430d24cfbc96764a1b96deb31f82; patch: 6.18.40; patch: 7.2; patch: 5.15.212; 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <3b08fed5b7e0d5e3a25d73ef3ba09cd33ade16c9; 2.6.15; patch: 5.10.261; 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <6e8cd710ca35c576f5f2e5a396047c9ac61f75e5; 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <bbcdef2061b170af45702ce6b359c02c12acfc94; patch: 0; 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <2a95ec21824a8ad81ad660b12231456fc0ac9830; 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <53ef70a315420ed31581d38343684b3bf9a3c76d; patch: 6.6.145; 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <a58230f3a7c4f6c3261786bc1efb72c42e68cd25; patch: 6.1.178; 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 <cd0d7bbc027b4d3329712cdcdeb4e5567ffd0d58; patch: 6.12.97; patch: 7.1.5

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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