CVE-2026-63970vsock/virtio: bind uarg before filling zerocopy skb
Updated under an hour ago ()
Does this affect you?
It affects Linux and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: bind uarg before filling zerocopy skb virtio_transport_send_pkt_info() allocates or reuses the zerocopy uarg before entering the send loop, but virtio_transport_alloc_skb() still fills the skb before it inherits that uarg. When fixed-buffer vectored zerocopy hits MAX_SKB_FRAGS, io_sg_from_iter() may partially attach managed frags and return -EMSGSIZE. The rollback path call kfree_skb() to free an skb that carries SKBFL_MANAGED_FRAG_REFS but no uarg, so skb_release_data() falls through to ordinary frag unref. Pass the uarg into virtio_transport_alloc_skb() and bind it immediately before virtio_transport_fill_skb(). This keeps control or no-payload skbs untouched while ensuring success and rollback share one lifetime rule.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 581512a6dc939ef122e49336626ae159f3b8a345 builds before 72194f65050958e4c8e069adb6c5d89ef81ca197; from 581512a6dc939ef122e49336626ae159f3b8a345 before b62e2b2b4a50953ca952f3cd3f77dd62dc50fd5d; 581512a6dc939ef122e49336626ae159f3b8a345 builds before 5d317573f1d48e76cce5fb6250452b6e4102e0fb; 581512a6dc939ef122e49336626ae159f3b8a345 builds before 1e584c304cfb94a759417130b1fc6d30b30c4cce | CNA record |
linux linux_kernel linux:linux_kernel | from 6.7 before 6.12.97; from 6.13 before 6.18.35; from 6.19 before 7.0.12; 7.1; 7.1; 7.1; 7.1; 7.1 | NVD |
References
- https://git.kernel.org/stable/c/72194f65050958e4c8e069adb6c5d89ef81ca197patch
- https://git.kernel.org/stable/c/b62e2b2b4a50953ca952f3cd3f77dd62dc50fd5dpatch
- https://git.kernel.org/stable/c/5d317573f1d48e76cce5fb6250452b6e4102e0fbpatch
- https://git.kernel.org/stable/c/1e584c304cfb94a759417130b1fc6d30b30c4ccepatch
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.