CVE-2026-80733
net: remove WARN_ON_ONCE() from sk_mc_loop()
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 3.15, 3.19, 3.20
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
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.
Timeline
- CVE published
Affected versions
- Linux Linux
From 3.14.40 · fixed in 3.15; From 3.18.13 · fixed in 3.19; From 3.19.6 · fixed in 3.20
- Linux Linux
4.0
References 8
git.kernel.org
- stable/c/97133c4d42654578fab95abe47359ebe784dde18
- stable/c/f625c742b33dc137c209dd13d1c5f12b1c18d71c
- stable/c/ad7fa2f411cb30f63d6725f111be134064cdb718
- stable/c/d2adc4e80b29e58b5162ae09f0f657a215806c8c
- stable/c/ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe
- stable/c/c8f256dc849205ccb2bd78bd99a3497b972b44e0
- stable/c/0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f
- stable/c/b8a39a09ae4eaae04309e1e38ed6a1101d967496