Resource Exhaustion The advisory has been revoked - it doesn't affect any version of package libperf (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL10-LIBPERF-17512608
- published26 Jun 2026
- disclosed24 Jun 2026
Introduced: 24 Jun 2026
CVE-2026-53070 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libperf package and not the libperf package as distributed by RHEL.
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
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2492347
- https://access.redhat.com/security/cve/CVE-2026-53070
- https://git.kernel.org/stable/c/0de7db2eb27e82b983157016fa604b1ba664ae5f
- https://git.kernel.org/stable/c/2cd7e6971fc2787408ceef17906ea152791448cf
- https://git.kernel.org/stable/c/790093245e35040c2adb15f48970020425aa3f47
- https://git.kernel.org/stable/c/be3bfcb34bda04f6a350710db471d4133f950f2c
- https://git.kernel.org/stable/c/7f0062c40781fe0a340965f5bb0816681982ff4c
- https://git.kernel.org/stable/c/e2933f5b3a31b175628985b92895269b778674a1