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CVE-2025-40248 is a race-condition vulnerability in the Linux kernel's vsock connect() handling, introduced in kernel version 3.9. Processing a signal or timeout can incorrectly disconnect a socket whose connection has already become established. Packet cancellation can race with sendmsg() credit accounting, permanently elevating vvs->bytes_unsent and disrupting SOCK_LINGER handling. Resetting socket state can also race with sockmap insertion, leaving a disconnected socket in the map and generating kernel warnings. Transitioning from SS_CONNECTED to SS_UNCONNECTED permits a transport change or removal after TCP_ESTABLISHED, potentially causing a use-after-free or null-pointer dereference during concurrent sendmsg() or connect() operations.
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A Linux kernel vsock race-condition vulnerability triggered when connect() handles a signal or timeout by disconnecting an already established socket. Concurrent operations can cause incorrect credit accounting, violate sockmap assumptions, or result in use-after-free and null-pointer dereference. The reference assigns a CVSS v3 base score of 7.8, with local access and low privileges required.
A Linux kernel vsock vulnerability that may cause memory corruption. Affected Rocky Linux 10.1 kernel packages have security updates under CIQ advisory crlsa-2026_1690.
A Linux kernel vsock race-condition vulnerability occurs when connect() handles a signal or timeout by disconnecting an already established socket. Concurrent socket operations can cause incorrect accounting, inconsistent sockmap state, and use-after-free or null-pointer dereference. The reference assigns a CVSS v3 score of 7.8, with local access and low privileges required. It recommends updating the linux package and related packages to version 6.1.159-1 or later.
A Linux kernel vsock race condition in connect() handling for already-established sockets. Signal or timeout processing could reset or disconnect an established socket, causing state and concurrency issues including potential use-after-free or null-pointer dereference. The affected Google COS kernel packages should be updated to version 18244.521.55 or later.
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Cross-references every affected SKU, including bundled OEM variants.
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