Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 before 6e8cd710ca35c576f5f2e5a396047c9ac61f75e5; affected 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 before 2a95ec21824a8ad81ad660b12231456fc0ac9830; affected 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 before bbcdef2061b170af45702ce6b359c02c12acfc94; affected 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 before cd0d7bbc027b4d3329712cdcdeb4e5567ffd0d58; affected 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 before 53ef70a315420ed31581d38343684b3bf9a3c76d; affected 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 before a58230f3a7c4f6c3261786bc1efb72c42e68cd25; affected 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 before 00bdce2fda7e430d24cfbc96764a1b96deb31f82; affected 9fb9cbb1082d6b31fb45aa1a14432449a0df6cf1 before 3b08fed5b7e0d5e3a25d73ef3ba09cd33ade16c9 |
| Linux / Linux | affected 2.6.15; unaffected 0 before 2.6.15; unaffected 5.10.261 through 5.10.*; unaffected 5.15.212 through 5.15.*; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.97 through 6.12.*; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/6e8cd710ca35c576f5f2e5a396047c9ac61f75e5
- https://git.kernel.org/stable/c/2a95ec21824a8ad81ad660b12231456fc0ac9830
- https://git.kernel.org/stable/c/bbcdef2061b170af45702ce6b359c02c12acfc94
- https://git.kernel.org/stable/c/cd0d7bbc027b4d3329712cdcdeb4e5567ffd0d58
- https://git.kernel.org/stable/c/53ef70a315420ed31581d38343684b3bf9a3c76d
- https://git.kernel.org/stable/c/a58230f3a7c4f6c3261786bc1efb72c42e68cd25
- https://git.kernel.org/stable/c/00bdce2fda7e430d24cfbc96764a1b96deb31f82
- https://git.kernel.org/stable/c/3b08fed5b7e0d5e3a25d73ef3ba09cd33ade16c9
ADP enrichment
No English description supplied.
No references supplied.