CVE-2026-72250
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
netfilter: nf_conntrack_reasm: guard mac_header adjustment after IPv6 defrag
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 | affected | git | 6e8cd710ca35c576f5f2e5a396047c9ac61f75e5 | Unavailable | None listed |
| 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 | affected | git | 2a95ec21824a8ad81ad660b12231456fc0ac9830 | Unavailable | None listed |
| 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 | affected | git | bbcdef2061b170af45702ce6b359c02c12acfc94 | Unavailable | None listed |
| 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 | affected | git | cd0d7bbc027b4d3329712cdcdeb4e5567ffd0d58 | Unavailable | None listed |
| 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 | affected | git | 53ef70a315420ed31581d38343684b3bf9a3c76d | Unavailable | None listed |
| 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 | affected | git | a58230f3a7c4f6c3261786bc1efb72c42e68cd25 | Unavailable | None listed |
| 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 | affected | git | 00bdce2fda7e430d24cfbc96764a1b96deb31f82 | Unavailable | None listed |
| 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 | affected | git | 3b08fed5b7e0d5e3a25d73ef3ba09cd33ade16c9 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 2.6.15 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 2.6.15 | Unavailable | None listed |
| 5.10.261 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.212 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.178 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.145 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.97 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.40 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.1.5 | unaffected | semver | Unavailable | 7.1.* | None listed |
| 7.2 | unaffected | original_commit_for_fix | Unavailable | * | None listed |