CVE-2026-45859 (GCVE-0-2026-45859)
Vulnerability from cvelistv5
Published
2026-05-27 12:15
Modified
2026-10-21 12:40
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_queue: do shared-unconfirmed check before segmentation Ulrich reports a regression with nfqueue: If an application did not set the 'F_GSO' capability flag and a gso packet with an unconfirmed nf_conn entry is received all packets are now dropped instead of queued, because the check happens after skb_gso_segment(). In that case, we did have exclusive ownership of the skb and its associated conntrack entry. The elevated use count is due to skb_clone happening via skb_gso_segment(). Move the check so that its peformed vs. the aggregated packet. Then, annotate the individual segments except the first one so we can do a 2nd check at reinject time. For the normal case, where userspace does in-order reinjects, this avoids packet drops: first reinjected segment continues traversal and confirms entry, remaining segments observe the confirmed entry. While at it, simplify nf_ct_drop_unconfirmed(): We only care about unconfirmed entries with a refcnt > 1, there is no need to special-case dying entries. This only happens with UDP. With TCP, the only unconfirmed packet will be the TCP SYN, those aren't aggregated by GRO. Next patch adds a udpgro test case to cover this scenario.
Impacted products
Vendor Product Version
Linux Linux Version: 74e6eb7fd27ef1ccc68041dbc66e6d80d2e4a1a0
Version: 7d8dc1c7be8d3509e8f5164dd5df64c8e34d7eeb
Version: 7d8dc1c7be8d3509e8f5164dd5df64c8e34d7eeb
Version: 7d8dc1c7be8d3509e8f5164dd5df64c8e34d7eeb
Version: 7d8dc1c7be8d3509e8f5164dd5df64c8e34d7eeb
Version: 6c4a0ba674f410ab99a30a16f32dac0ebfed5cd3
Version: 6dcc8ba8a6074bb79040f502dc66ad23a58a1c86
Version: 025b3326c5c409b372d0103ad30f174e55adbd1b
Version: 6.6.48   ≤
Version: 5.15.166   ≤
Version: 6.1.107   ≤
Version: 6.10.7   ≤
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