Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 74e6eb7fd27ef1ccc68041dbc66e6d80d2e4a1a0 before aead84bdacd77e08357fd718e5dcaffaf387f3c3; affected 7d8dc1c7be8d3509e8f5164dd5df64c8e34d7eeb before 79b713ef4261a8ead96af4703f89d0b5f25532e2; affected 7d8dc1c7be8d3509e8f5164dd5df64c8e34d7eeb before 23901aa6b8a2f294c4b774436b4691f3ff863a8f; affected 7d8dc1c7be8d3509e8f5164dd5df64c8e34d7eeb before b740e7ddd7ca0dbfeafca3f5e52717206cf28524; affected 7d8dc1c7be8d3509e8f5164dd5df64c8e34d7eeb before 207b3ebacb6113acaaec0d171d5307032c690004; affected 6c4a0ba674f410ab99a30a16f32dac0ebfed5cd3; affected 6dcc8ba8a6074bb79040f502dc66ad23a58a1c86; affected 025b3326c5c409b372d0103ad30f174e55adbd1b; affected 6.6.48 before 6.6.160; affected 5.15.166 before 5.16; affected 6.1.107 before 6.2; affected 6.10.7 before 6.11 |
| Linux / Linux | affected 6.11; unaffected 0 before 6.11; unaffected 6.6.160 through 6.6.*; unaffected 6.12.75 through 6.12.*; unaffected 6.18.14 through 6.18.*; unaffected 6.19.4 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/aead84bdacd77e08357fd718e5dcaffaf387f3c3
- https://git.kernel.org/stable/c/79b713ef4261a8ead96af4703f89d0b5f25532e2
- https://git.kernel.org/stable/c/23901aa6b8a2f294c4b774436b4691f3ff863a8f
- https://git.kernel.org/stable/c/b740e7ddd7ca0dbfeafca3f5e52717206cf28524
- https://git.kernel.org/stable/c/207b3ebacb6113acaaec0d171d5307032c690004
ADP enrichment
No English description supplied.
No references supplied.