CVE-2026-72250High· 7.8▾ TwilightIn 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 th…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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.
Linux >= 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 < 6e8cd710ca35c576f5f2e5a396047c9ac61f75e5Linux >= 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 < 2a95ec21824a8ad81ad660b12231456fc0ac9830Linux >= 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 < bbcdef2061b170af45702ce6b359c02c12acfc94Linux >= 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 < cd0d7bbc027b4d3329712cdcdeb4e5567ffd0d58Linux >= 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 < 53ef70a315420ed31581d38343684b3bf9a3c76dLinux >= 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 < a58230f3a7c4f6c3261786bc1efb72c42e68cd25Linux >= 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 < 00bdce2fda7e430d24cfbc96764a1b96deb31f82Linux >= 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 < 3b08fed5b7e0d5e3a25d73ef3ba09cd33ade16c9Linux 2.6.15Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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