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CVE-2022-33743 is a use-after-free vulnerability in the Linux kernel Xen netfront driver's XDP packet-processing path. While adding XDP support, a control-flow label was moved such that socket buffers (SKBs) whose references had been retained for subsequent processing could still be freed. A Xen network backend can thereby cause the guest's netfront driver to access freed SKBs. The issue affects Linux kernel versions 5.9 through 5.18.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux Xen netfront use-after-free vulnerability caused by a malicious or faulty network backend.
Linux Xen netfront use-after-free involving socket buffers.
A Linux kernel Xen netfront/XDP memory-leak vulnerability that can enable denial of service when a non-root privileged host user sends malicious packets to guest systems.
A Linux kernel Xen networking XDP incomplete-cleanup (memory-leak) flaw that can allow a locally authenticated low-privileged user to cause a denial of service by retaining SKBs in the networking stack. Privilege escalation was not ruled out in the CVSS assessment.
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.