CVE-2026-80733 Affecting python3-perf package, versions <1:6.1.186-228.374.amzn2023
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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- published15 Sept 2026
- disclosed3 Sept 2026
Introduced: 3 Sep 2026
NewCVE-2026-80733 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2023 python3-perf to version 1:6.1.186-228.374.amzn2023 or higher.
This issue was patched in ALAS2023-2026-2143.
NVD Description
Note: Versions mentioned in the description apply only to the upstream python3-perf package and not the python3-perf package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
net: remove WARN_ON_ONCE() from sk_mc_loop()
sk_mc_loop() can be called for sockets that are neither AF_INET nor AF_INET6 (e.g. AF_PACKET sockets when sending packets via raw/packet socket over virtual devices such as VRF or ipvlan).
In such cases, sk_family is not AF_INET/AF_INET6 and sk_mc_loop() falls through the switch statement and triggers WARN_ON_ONCE(1).
Non-INET sockets do not support IP_MULTICAST_LOOP or IPV6_MULTICAST_LOOP options, so loopback should default to true without generating a warning.
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-80733
- https://git.kernel.org/stable/c/0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f
- https://git.kernel.org/stable/c/97133c4d42654578fab95abe47359ebe784dde18
- https://git.kernel.org/stable/c/ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe
- https://git.kernel.org/stable/c/ad7fa2f411cb30f63d6725f111be134064cdb718
- https://git.kernel.org/stable/c/b8a39a09ae4eaae04309e1e38ed6a1101d967496
- https://git.kernel.org/stable/c/c8f256dc849205ccb2bd78bd99a3497b972b44e0
- https://git.kernel.org/stable/c/d2adc4e80b29e58b5162ae09f0f657a215806c8c
- https://git.kernel.org/stable/c/f625c742b33dc137c209dd13d1c5f12b1c18d71c