vsock: prevent null-ptr-deref in vsock_*[has_data|has_space]

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In the Linux kernel, the following vulnerability has been resolved: vsock: prevent null-ptr-deref in vsock_*[has_data|has_space] Recent reports have shown how we sometimes call vsock_*_has_data() when a vsock socket has been de-assigned from a transport (see attached links), but we shouldn't. Previous commits should have solved the real problems, but we may have more in the future, so to avoid null-ptr-deref, we can return 0 (no space, no data available) but with a warning. This way the code should continue to run in a nearly consistent state and have a warning that allows us to debug future problems.

Source published

31 Jan 2025 11:25:31 UTC

Source modified

15 Oct 2026 01:02:53 UTC

Observed here

23 Oct 2026 15:48:27 UTC

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