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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc0cfa2d8a788fcf45df5bf4070ab2474c88d543a < 18a7fc371d1dbf8deff16c2dd9292bcc73f43040affected
LinuxLinuxc0cfa2d8a788fcf45df5bf4070ab2474c88d543a < 6486915fa661584d70e8e7e4068c6c075c67dd6daffected
LinuxLinuxc0cfa2d8a788fcf45df5bf4070ab2474c88d543a < 88244163bc7e7b0ce9dd7bf4c8a563b41525c3eeaffected
LinuxLinuxc0cfa2d8a788fcf45df5bf4070ab2474c88d543a < d88b249e14bd0ee1e46bbe4f456e22e01b8c68deaffected
LinuxLinuxc0cfa2d8a788fcf45df5bf4070ab2474c88d543a < 677579b641af109613564460a4e3bdcb16850b61affected
LinuxLinuxc0cfa2d8a788fcf45df5bf4070ab2474c88d543a < 2cb7c756f605ec02ffe562fb26828e4bcc5fdfc1affected
LinuxLinux5.5affected
LinuxLinux0 < 5.5unaffected
LinuxLinux5.10.234 <= 5.10.*unaffected
LinuxLinux5.15.177 <= 5.15.*unaffected
LinuxLinux6.1.127 <= 6.1.*unaffected
LinuxLinux6.6.74 <= 6.6.*unaffected
LinuxLinux6.12.11 <= 6.12.*unaffected
LinuxLinux6.13 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

Additional References

References