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CVE-2021-47099 is a flaw in the Linux kernel virtual Ethernet (veth) driver introduced in Linux 5.13. When Generic Receive Offload (GRO) is enabled on a veth device, TCP Segmentation Offload (TSO) is disabled on its peer, NAPI is active, and no XDP program is attached, the veth receive path can deliver shared or cloned socket buffers to the GRO engine without validating their sharing state. Subsequent TCP processing can trigger a kernel BUG in skb_shift. The upstream correction attempts to unclone buffers and bypasses GRO when buffers remain shared or cloned.
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A Linux kernel veth flaw involving cloned socket buffers entering Generic Receive Offload (GRO).
Linux kernel vulnerability addressed by this kernel-rt update; no issue description is provided in the content.
Linux kernel vulnerability addressed by RHSA-2022:7683; no flaw details are provided in this advisory text.
Unknown.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.