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CVE-2026-80733— net: remove WARN_ON_ONCE() from sk_mc_loop()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于sk_mc_loop()函数在套接字族不是AF_INET或AF_INET6时处理不当，可能触发WARN_ON_ONCE警告。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.21% · P12

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 24

VendorProduct Version RangeStatus
Linux Linux f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90< 97133c4d42654578fab95abe47359ebe784dde18 affected
f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90< f625c742b33dc137c209dd13d1c5f12b1c18d71c affected
f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90< ad7fa2f411cb30f63d6725f111be134064cdb718 affected
f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90< d2adc4e80b29e58b5162ae09f0f657a215806c8c affected
f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90< ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe affected
f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90< c8f256dc849205ccb2bd78bd99a3497b972b44e0 affected
f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90< 0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f affected
f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90< b8a39a09ae4eaae04309e1e38ed6a1101d967496 affected
… +16 more rows
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I. Basic Information for CVE-2026-80733

Vulnerability Information
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Vulnerability Title
net: remove WARN_ON_ONCE() from sk_mc_loop()
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于sk_mc_loop()函数在套接字族不是AF_INET或AF_INET6时处理不当，可能触发WARN_ON_ONCE警告。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 ~ 97133c4d42654578fab95abe47359ebe784dde18 -
Linux Linux 4.0 -

II. Public POCs for CVE-2026-80733

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III. Intelligence Information for CVE-2026-80733

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Patches & Fixes for CVE-2026-80733 (7)

Same Patch Batch · Linux · 2026-09-03 · 32 CVEs total

CVE-2026-80726 9.3 CRITICAL KVM: x86/mmu: WARN and clear role.invalid when creating a child shadow page
CVE-2026-80734 8.8 HIGH btrfs: initialize inode mapping flags for cached inodes
CVE-2026-80745 8.4 HIGH regulator: fp9931: Fix VPOS/VNEG voltage selector table
CVE-2026-80750 8.4 HIGH pmdomain: mediatek: fix remaining %pOF after of_node_put()
CVE-2026-80752 8.4 HIGH Input: psxpad-spi - set driver data before use
CVE-2026-80753 8.4 HIGH ovpn: run deferred work on a module-owned workqueue
CVE-2026-80747 8.0 HIGH drm/amdkfd: Add bounds check for CRAT subtype length
CVE-2026-80751 7.8 HIGH pmdomain: mediatek: mfg: initialize prev_o in mtk_mfg_attach_dev()
CVE-2026-80754 7.8 HIGH Input: synaptics-rmi4 - fix F55 transmitter electrode count typo
CVE-2026-80748 7.8 HIGH mmc: loongson2: Fix sg iteration in data reorder functions
CVE-2026-80736 7.8 HIGH thunderbolt: Fix bandwidth group reservation indexing
CVE-2026-80737 7.8 HIGH serial: amba-pl011: synchronize DMA teardown
CVE-2026-80732 7.8 HIGH ata: pata_sl82c105: fix bridge revision use-after-free
CVE-2026-80731 7.8 HIGH net: remove CAP_SYS_RAWIO zero-padding in dev_validate_header
CVE-2026-80735 7.3 HIGH ovpn: ensure socket is owned by ovpn before deref sk_user_data
CVE-2026-80738 7.3 HIGH bpf: Check sk_state before sk_protocol in bpf_tcp_*_syncookie
CVE-2026-80741 7.1 HIGH drm/log: Fix out-of-bounds read on empty message length
CVE-2026-80749 7.1 HIGH drm/connector/hdmi: Fix out of bounds memory read
CVE-2026-80730 ring-buffer: Fix crash passing ERR_PTR to kthread_stop()
CVE-2026-80727 x86/mce: Set up the polling timer before CMCI discovery

Showing top 20 of 32 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80733

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