vsock/virtio: bind uarg before filling zerocopy skb (Linux Linux)

CVE-2026-63970
HIGH 7.8

At a glance

Source
NVD
EPSS
EPSS 0.18 % · percentile 7 ()
State
PUBLISHED
Published
Updated
Assigner
Linux
NVD status
Modified

Description

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.

Weaknesses (CWE)

  • CWE-401 — Missing Release of Memory after Effective Lifetime
  • CWE-416 — Use After Free

References

Scores

VersionScoreVectorScored by
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
Linux · Linuxaffected 581512a6dc939ef122e49336626ae159f3b8a345 < 72194f65050958e4c8e069adb6c5d89ef81ca197 ; affected 581512a6dc939ef122e49336626ae159f3b8a345 < b62e2b2b4a50953ca952f3cd3f77dd62dc50fd5d ; affected 581512a6dc939ef122e49336626ae159f3b8a345 < 5d317573f1d48e76cce5fb6250452b6e4102e0fb ; affected 581512a6dc939ef122e49336626ae159f3b8a345 < 1e584c304cfb94a759417130b1fc6d30b30c4cce
Linux · Linuxaffected 6.7 ; unaffected 0 < 6.7 ; unaffected 6.12.97 ≤ 6.12.* ; unaffected 6.18.35 ≤ 6.18.* ; unaffected 7.0.12 ≤ 7.0.* ; unaffected 7.1 ≤ *

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD