CVE-2026-80733

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Source
https://cve.org/CVERecord?id=CVE-2026-80733
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80733.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-80733
Downstream
Published
2026-09-03T08:21:50Z
Modified
2026-10-08T02:52:03Z
Summary
net: remove WARN_ON_ONCE() from sk_mc_loop()
Details

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.

Database specific 
{
    "cna_assigner":  "Linux",
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80733.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90
Fixed
97133c4d42654578fab95abe47359ebe784dde18
Fixed
f625c742b33dc137c209dd13d1c5f12b1c18d71c
Fixed
ad7fa2f411cb30f63d6725f111be134064cdb718
Fixed
d2adc4e80b29e58b5162ae09f0f657a215806c8c
Fixed
ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe
Fixed
c8f256dc849205ccb2bd78bd99a3497b972b44e0
Fixed
0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f
Fixed
b8a39a09ae4eaae04309e1e38ed6a1101d967496
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
3.14.40
Fixed
3.15
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
3.18.13
Fixed
3.19
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
3.19.6
Fixed
3.20
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
c91f81773cd4bbebfe744e9ab30a7ce093f9b930
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
c8c30b2b17f2133e953850c547e3902c3a3d80e2
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
3fe207e4637a2e792c46a08666aa722f77d7f8f7

Affected versions

v3.*
v3.14.40
v3.14.41
v3.14.42
v3.14.43
v3.14.44
v3.14.45
v3.14.46
v3.14.47
v3.14.48
v3.14.49
v3.14.50
v3.14.51
v3.14.52
v3.14.53
v3.14.54
v3.14.55
v3.14.56
v3.14.57
v3.14.58
v3.14.59
v3.14.60
v3.14.61
v3.14.62
v3.14.63
v3.14.64
v3.14.65
v3.14.66
v3.14.67
v3.14.68
v3.14.69
v3.14.70
v3.14.71
v3.14.72
v3.14.73
v3.14.74
v3.14.75
v3.14.76
v3.14.77
v3.14.78
v3.14.79
v3.18.100
v3.18.101
v3.18.102
v3.18.103
v3.18.104
v3.18.105
v3.18.106
v3.18.107
v3.18.108
v3.18.109
v3.18.110
v3.18.111
v3.18.112
v3.18.113
v3.18.114
v3.18.115
v3.18.116
v3.18.117
v3.18.118
v3.18.119
v3.18.120
v3.18.121
v3.18.122
v3.18.123
v3.18.124
v3.18.125
v3.18.126
v3.18.127
v3.18.128
v3.18.129
v3.18.13
v3.18.130
v3.18.131
v3.18.132
v3.18.133
v3.18.134
v3.18.135
v3.18.136
v3.18.137
v3.18.138
v3.18.139
v3.18.14
v3.18.140
v3.18.15
v3.18.16
v3.18.17
v3.18.18
v3.18.19
v3.18.20
v3.18.21
v3.18.22
v3.18.23
v3.18.24
v3.18.25
v3.18.26
v3.18.27
v3.18.28
v3.18.29
v3.18.30
v3.18.31
v3.18.32
v3.18.33
v3.18.34
v3.18.35
v3.18.36
v3.18.37
v3.18.38
v3.18.39
v3.18.40
v3.18.41
v3.18.42
v3.18.43
v3.18.44
v3.18.45
v3.18.46
v3.18.47
v3.18.48
v3.18.49
v3.18.50
v3.18.51
v3.18.52
v3.18.53
v3.18.54
v3.18.55
v3.18.56
v3.18.57
v3.18.58
v3.18.59
v3.18.60
v3.18.61
v3.18.62
v3.18.63
v3.18.64
v3.18.65
v3.18.66
v3.18.67
v3.18.68
v3.18.69
v3.18.70
v3.18.71
v3.18.72
v3.18.73
v3.18.74
v3.18.75
v3.18.76
v3.18.77
v3.18.78
v3.18.79
v3.18.80
v3.18.81
v3.18.82
v3.18.83
v3.18.84
v3.18.85
v3.18.86
v3.18.87
v3.18.88
v3.18.89
v3.18.90
v3.18.91
v3.18.92
v3.18.93
v3.18.94
v3.18.95
v3.18.96
v3.18.97
v3.18.98
v3.18.99
v3.19.6
v3.19.7
v3.19.8

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80733.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
4.0.0
Fixed
5.10.265
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.216
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.183
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.152
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.104
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.18.45
Type
ECOSYSTEM
Events
Introduced
6.19.0
Fixed
7.1.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80733.json"