CVE-2025-21669

Summary

In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: discard packets if the transport changes If the socket has been de-assigned or assigned to another transport, we must discard any packets received because they are not expected and would cause issues when we access vsk->transport. A possible scenario is described by Hyunwoo Kim in the attached link, where after a first connect() interrupted by a signal, and a second connect() failed, we can find `vsk->transport` at NULL, leading to a NULL pointer dereference.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/18a7fc371d1dbf8deff16c2dd9292bcc73f43040 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/18a7fc371d1dbf8deff16c2dd9292bcc73f43040Patch
• https://git.kernel.org/stable/c/2cb7c756f605ec02ffe562fb26828e4bcc5fdfc1Patch
• https://git.kernel.org/stable/c/6486915fa661584d70e8e7e4068c6c075c67dd6dPatch
• https://git.kernel.org/stable/c/677579b641af109613564460a4e3bdcb16850b61Patch
• https://git.kernel.org/stable/c/88244163bc7e7b0ce9dd7bf4c8a563b41525c3eePatch
• https://git.kernel.org/stable/c/d88b249e14bd0ee1e46bbe4f456e22e01b8c68dePatch
• https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
• https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html