Answer in brief
CVE-2026-63970 records a Unknown severity vulnerability in vsock/virtio: bind uarg before filling zerocopy skb. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=581512a6dc939ef122e49336626ae159f3b8a345 <72194f65050958e4c8e069adb6c5d89ef81ca197 || >=581512a6dc939ef122e49336626ae159f3b8a345 <b62e2b2b4a50953ca952f3cd3f77dd62dc50fd5d || >=581512a6dc939ef122e49336626ae159f3b8a345 <5d317573f1d48e76cce5fb6250452b6e4102e0fb || >=581512a6dc939ef122e49336626ae159f3b8a345 <1e584c304cfb94a759417130b1fc6d30b30c4cce | 72194f65050958e4c8e069adb6c5d89ef81ca197, b62e2b2b4a50953ca952f3cd3f77dd62dc50fd5d, 5d317573f1d48e76cce5fb6250452b6e4102e0fb, 1e584c304cfb94a759417130b1fc6d30b30c4cce |
| Linux/Linuxgeneric | 6.7 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-63970 records a Unknown severity vulnerability in vsock/virtio: bind uarg before filling zerocopy skb. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=581512a6dc939ef122e49336626ae159f3b8a345 <72194f65050958e4c8e069adb6c5d89ef81ca197 || >=581512a6dc939ef122e49336626ae159f3b8a345 <b62e2b2b4a50953ca952f3cd3f77dd62dc50fd5d || >=581512a6dc939ef122e49336626ae159f3b8a345 <5d317573f1d48e76cce5fb6250452b6e4102e0fb || >=581512a6dc939ef122e49336626ae159f3b8a345 <1e584c304cfb94a759417130b1fc6d30b30c4cce | 72194f65050958e4c8e069adb6c5d89ef81ca197, b62e2b2b4a50953ca952f3cd3f77dd62dc50fd5d, 5d317573f1d48e76cce5fb6250452b6e4102e0fb, 1e584c304cfb94a759417130b1fc6d30b30c4cce |
| Linux/Linuxgeneric | 6.7 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.