Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix empty payload in tap skb for non-linear buffers For non-linear skbs, virtio_transport_build_skb() goes through virtio_transport_copy_nonlinear_skb() to copy the original payload in the new skb to be delivered to the vsockmon tap device. This manually initializes an iov_iter but does not set iov_iter.count. Since the iov_iter is zero-initialized, the copy length is zero and no payload is actually copied to the monitor interface, leaving data un-initialized. Fix this by removing the linear vs non-linear split and using skb_copy_datagram_iter() with iov_iter_kvec() for all cases, as vhost-vsock already does. This handles both linear and non-linear skbs, properly initializes the iov_iter, and removes the now unused virtio_transport_copy_nonlinear_skb(). While touching this code, let's also check the return value of skb_copy_datagram_iter(), even though it's unlikely to fail.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 4b0bf10eb077cb43c09746251ef3608d62c45667 before 06747f52ab157591cec7e5623a759473b66ef6f6; affected 4b0bf10eb077cb43c09746251ef3608d62c45667 before 52da6a74ca3de0fcda60301096b71534b3b18641; affected 4b0bf10eb077cb43c09746251ef3608d62c45667 before 378b131a25bd1a5ee27ca199fe486c299d5350c5; affected 4b0bf10eb077cb43c09746251ef3608d62c45667 before 3a3e3d90cbc79600544536723911657730759af3 |
| Linux / Linux | affected 6.7; unaffected 0 before 6.7; unaffected 6.12.90 through 6.12.*; unaffected 6.18.32 through 6.18.*; unaffected 7.0.9 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.