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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-72250 Detail

Description

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/00bdce2fda7e430d24cfbc96764a1b96deb31f82 kernel.org
https://git.kernel.org/stable/c/2a95ec21824a8ad81ad660b12231456fc0ac9830 kernel.org
https://git.kernel.org/stable/c/3b08fed5b7e0d5e3a25d73ef3ba09cd33ade16c9 kernel.org
https://git.kernel.org/stable/c/53ef70a315420ed31581d38343684b3bf9a3c76d kernel.org
https://git.kernel.org/stable/c/6e8cd710ca35c576f5f2e5a396047c9ac61f75e5 kernel.org
https://git.kernel.org/stable/c/a58230f3a7c4f6c3261786bc1efb72c42e68cd25 kernel.org
https://git.kernel.org/stable/c/bbcdef2061b170af45702ce6b359c02c12acfc94 kernel.org
https://git.kernel.org/stable/c/cd0d7bbc027b4d3329712cdcdeb4e5567ffd0d58 kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-72250
NVD Published Date:
08/15/2026
NVD Last Modified:
08/15/2026
Source:
kernel.org