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

Summary

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.

Timeline

1. Jan 31, 2025, 11:25 AM UTCCVE published
2. Oct 1, 2025, 7:52 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Oct 15, 2026, 1:02 AM UTCRecord last updated

Affected versions

• Linux Linux

  From c0cfa2d8a788fcf45df5bf4070ab2474c88d543a · fixed in daeac89cdb03d30028186f5ff7dc26ec8fa843e7; From c0cfa2d8a788fcf45df5bf4070ab2474c88d543a · fixed in 9e5fed46ccd2c34c5fa5a9c8825ce4823fdc853e; From c0cfa2d8a788fcf45df5bf4070ab2474c88d543a · fixed in b52e50dd4fabd12944172bd486a4f4853b7f74dd; From c0cfa2d8a788fcf45df5bf4070ab2474c88d543a · fixed in bc9c49341f9728c31fe248c5fbba32d2e81a092b; From c0cfa2d8a788fcf45df5bf4070ab2474c88d543a · fixed in c23d1d4f8efefb72258e9cedce29de10d057f8ca; From c0cfa2d8a788fcf45df5bf4070ab2474c88d543a · fixed in 91751e248256efc111e52e15115840c35d85abaf

• Linux Linux

  5.5

• KernelLinux

  From 5.5.0 · fixed in 5.10.234; From 5.11.0 · fixed in 5.15.177; From 5.16.0 · fixed in 6.1.127; From 6.2.0 · fixed in 6.6.74; From 6.7.0 · fixed in 6.12.11

References 6