CVE-2026-46207vsock/virtio: fix empty payload in tap skb for non-linear buffers
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Jun 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 4b0bf10eb077cb43c09746251ef3608d62c45667 before 06747f52ab157591cec7e5623a759473b66ef6f6; from 4b0bf10eb077cb43c09746251ef3608d62c45667 before 52da6a74ca3de0fcda60301096b71534b3b18641; from 4b0bf10eb077cb43c09746251ef3608d62c45667 before 378b131a25bd1a5ee27ca199fe486c299d5350c5; 4b0bf10eb077cb43c09746251ef3608d62c45667 builds before 3a3e3d90cbc79600544536723911657730759af3 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.7 before 6.12.90; from 6.13 before 6.18.32; from 6.19 before 7.0.9; 7.1; 7.1; 7.1 | NVD |
References
- https://git.kernel.org/stable/c/06747f52ab157591cec7e5623a759473b66ef6f6patch
- https://git.kernel.org/stable/c/52da6a74ca3de0fcda60301096b71534b3b18641patch
- https://git.kernel.org/stable/c/378b131a25bd1a5ee27ca199fe486c299d5350c5patch
- https://git.kernel.org/stable/c/3a3e3d90cbc79600544536723911657730759af3patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.