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CVE-2026-64531 is a Linux kernel Open vSwitch vulnerability caused by failure to constrain generated nested Netlink action attributes to the 16-bit nla_len representation. Although the overall generated flow-action stream may validly exceed 64 KiB, an individual nested action container cannot. Oversized nested containers, including CLONE or connection-tracking actions, can be closed with a truncated length field. Subsequent action dumping or teardown then traverses a stream whose structure differs from the stream originally validated, potentially interpreting bytes within the oversized container as independent actions. The fix rejects generated nested containers exceeding the representable attribute length, propagates failures to callers, and correctly releases resources held by discarded action-list tails.
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No valid public exploits. Mallory filtered out 5 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
99 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux local privilege-escalation vulnerability, called OVSwrap, associated with Open vSwitch Netlink handling.
A Linux Open vSwitch nested-Netlink action length-truncation vulnerability. A wrapping 16-bit nla_len can yield kernel read and targeted decrement primitives; the public PoC uses a user/network namespace to alter a host process's credentials and create a passwordless sudo rule.
A vulnerability addressed by Ubuntu Security Notice USN-8748-1.
Linux Open vSwitch oversized nested-action attribute handling flaw.
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.