CVE-2025-39718vsock/virtio: Validate length in packet header before skb_put()
- 8.4HighCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: Validate length in packet header before skb_put() When receiving a vsock packet in the guest, only the virtqueue buffer size is validated prior to virtio_vsock_skb_rx_put(). Unfortunately, virtio_vsock_skb_rx_put() uses the length from the packet header as the length argument to skb_put(), potentially resulting in SKB overflow if the host has gone wonky. Validate the length as advertised by the packet header before calling virtio_vsock_skb_rx_put().
Timeline
ID reserved
By Linux
- 5 months later
· 5 months later
Published
- 14 months later
· 14 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.4 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.4.
Affected products
- affected baddcc2c71572968cdaeee1c4ab3dc0ad90fa765 – < 969b06bd8b7560efb100a34227619e7d318fbe05
- affected 71dc9ec9ac7d3eee785cdc986c3daeb821381e20 – < ee438c492b2e0705d819ac0e25d04fae758d8f8f
- affected 71dc9ec9ac7d3eee785cdc986c3daeb821381e20 – < faf332a10372390ce65d0b803888f4b25a388335
- affected 71dc9ec9ac7d3eee785cdc986c3daeb821381e20 – < 676f03760ca1d69c2470cef36c44dc152494b47c
- affected 71dc9ec9ac7d3eee785cdc986c3daeb821381e20 – < 0dab92484474587b82e8e0455839eaf5ac7bf894
- affected 6.1.63 – < 6.1.149
- affected 6.3
- unaffected < 6.3
- unaffected 6.1.149 – ≤ 6.1.*
- unaffected 6.6.103 – ≤ 6.6.*
- unaffected 6.12.44 – ≤ 6.12.*
- unaffected 6.16.4 – ≤ 6.16.*
- unaffected 6.17 – ≤ *
References
References7
- https://git.kernel.org/stable/c/969b06bd8b7560efb100a34227619e7d318fbe05 (opens in a new tab)
- https://git.kernel.org/stable/c/ee438c492b2e0705d819ac0e25d04fae758d8f8f (opens in a new tab)
- https://git.kernel.org/stable/c/faf332a10372390ce65d0b803888f4b25a388335 (opens in a new tab)
- https://git.kernel.org/stable/c/676f03760ca1d69c2470cef36c44dc152494b47c (opens in a new tab)
- https://git.kernel.org/stable/c/0dab92484474587b82e8e0455839eaf5ac7bf894 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-31509 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-39718)Record last updated .