| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-21669: vsock/virtio: discard packets if the transport changes |
| |
| Description |
| =========== |
| |
| 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. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21669 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.5 with commit c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and fixed in 5.10.234 with commit 18a7fc371d1dbf8deff16c2dd9292bcc73f43040 |
| Issue introduced in 5.5 with commit c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and fixed in 5.15.177 with commit 6486915fa661584d70e8e7e4068c6c075c67dd6d |
| Issue introduced in 5.5 with commit c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and fixed in 6.1.127 with commit 88244163bc7e7b0ce9dd7bf4c8a563b41525c3ee |
| Issue introduced in 5.5 with commit c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and fixed in 6.6.74 with commit d88b249e14bd0ee1e46bbe4f456e22e01b8c68de |
| Issue introduced in 5.5 with commit c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and fixed in 6.12.11 with commit 677579b641af109613564460a4e3bdcb16850b61 |
| Issue introduced in 5.5 with commit c0cfa2d8a788fcf45df5bf4070ab2474c88d543a and fixed in 6.13 with commit 2cb7c756f605ec02ffe562fb26828e4bcc5fdfc1 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2025-21669 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| net/vmw_vsock/virtio_transport_common.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/18a7fc371d1dbf8deff16c2dd9292bcc73f43040 |
| https://git.kernel.org/stable/c/6486915fa661584d70e8e7e4068c6c075c67dd6d |
| https://git.kernel.org/stable/c/88244163bc7e7b0ce9dd7bf4c8a563b41525c3ee |
| https://git.kernel.org/stable/c/d88b249e14bd0ee1e46bbe4f456e22e01b8c68de |
| https://git.kernel.org/stable/c/677579b641af109613564460a4e3bdcb16850b61 |
| https://git.kernel.org/stable/c/2cb7c756f605ec02ffe562fb26828e4bcc5fdfc1 |
