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CVE-2025-40248 is a race condition in the Linux kernel AF_VSOCK connect() path. When connect() on a socket that has already become established is interrupted by a signal or timeout, vulnerable code can disconnect and reset that established socket. The resulting state transition can race with sendmsg() credit handling and sockmap insertion. In the virtio transport path, packet cancellation and skb purging can race with credit retrieval, leaving unsent-byte accounting elevated. Resetting an established socket can also leave a disconnected socket in a sockmap or allow a transport change or drop after TCP_ESTABLISHED, creating conditions for use-after-free or null-pointer dereference. The upstream correction ignores signals and timeouts once the vsock socket is established, while retaining the existing handling for unconnected sockets.
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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.
34 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Important-severity Linux kernel vsock vulnerability that may lead to memory corruption. Red Hat issued a kernel live-patch update for affected Red Hat Enterprise Linux 8 kernel builds.
A Linux kernel vsock vulnerability that may result in memory corruption.
A Linux kernel vsock vulnerability that may lead to memory corruption.
A Linux kernel vsock vulnerability that may result in memory corruption.
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.