Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: sctp: disable BH before calling udp_tunnel_xmit_skb() udp_tunnel_xmit_skb() / udp_tunnel6_xmit_skb() are expected to run with BH disabled. After commit 6f1a9140ecda ("add xmit recursion limit to tunnel xmit functions"), on the path: udp(6)_tunnel_xmit_skb() -> ip(6)tunnel_xmit() dev_xmit_recursion_inc()/dec() must stay balanced on the same CPU. Without local_bh_disable(), the context may move between CPUs, which can break the inc/dec pairing. This may lead to incorrect recursion level detection and cause packets to be dropped in ip(6)_tunnel_xmit() or __dev_queue_xmit(). Fix it by disabling BH around both IPv4 and IPv6 SCTP UDP xmit paths. In my testing, after enabling the SCTP over UDP: # ip net exec ha sysctl -w net.sctp.udp_port=9899 # ip net exec ha sysctl -w net.sctp.encap_port=9899 # ip net exec hb sysctl -w net.sctp.udp_port=9899 # ip net exec hb sysctl -w net.sctp.encap_port=9899 # ip net exec ha iperf3 -s - without this patch: # ip net exec hb iperf3 -c 192.168.0.1 --sctp [ 5] 0.00-10.00 sec 37.2 MBytes 31.2 Mbits/sec sender [ 5] 0.00-10.00 sec 37.1 MBytes 31.1 Mbits/sec receiver - with this patch: # ip net exec hb iperf3 -c 192.168.0.1 --sctp [ 5] 0.00-10.00 sec 3.14 GBytes 2.69 Gbits/sec sender [ 5] 0.00-10.00 sec 3.14 GBytes 2.69 Gbits/sec receiver
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 046c052b475e7119b6a30e3483e2888fc606a2f8 before 7f0062c40781fe0a340965f5bb0816681982ff4c; affected 046c052b475e7119b6a30e3483e2888fc606a2f8 before be3bfcb34bda04f6a350710db471d4133f950f2c; affected 046c052b475e7119b6a30e3483e2888fc606a2f8 before 0de7db2eb27e82b983157016fa604b1ba664ae5f; affected 046c052b475e7119b6a30e3483e2888fc606a2f8 before 790093245e35040c2adb15f48970020425aa3f47; affected 046c052b475e7119b6a30e3483e2888fc606a2f8 before 2cd7e6971fc2787408ceef17906ea152791448cf |
| Linux / Linux | affected 5.11; unaffected 0 before 5.11; unaffected 6.6.160 through 6.6.*; unaffected 6.12.95 through 6.12.*; unaffected 6.18.37 through 6.18.*; unaffected 7.0.10 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/7f0062c40781fe0a340965f5bb0816681982ff4c
- https://git.kernel.org/stable/c/be3bfcb34bda04f6a350710db471d4133f950f2c
- https://git.kernel.org/stable/c/0de7db2eb27e82b983157016fa604b1ba664ae5f
- https://git.kernel.org/stable/c/790093245e35040c2adb15f48970020425aa3f47
- https://git.kernel.org/stable/c/2cd7e6971fc2787408ceef17906ea152791448cf
ADP enrichment
No English description supplied.
No references supplied.