{"id":"CVE-2025-39718","title":"vsock/virtio: Validate length in packet header before skb_put()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/virtio: Validate length in packet header before skb_put()\n\nWhen receiving a vsock packet in the guest, only the virtqueue buffer\nsize is validated prior to virtio…","severity":"high","cvss":8.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= baddcc2c71572968cdaeee1c4ab3dc0ad90fa765 < 969b06bd8b7560efb100a34227619e7d318fbe05","Linux >= 71dc9ec9ac7d3eee785cdc986c3daeb821381e20 < ee438c492b2e0705d819ac0e25d04fae758d8f8f","Linux >= 71dc9ec9ac7d3eee785cdc986c3daeb821381e20 < faf332a10372390ce65d0b803888f4b25a388335","Linux >= 71dc9ec9ac7d3eee785cdc986c3daeb821381e20 < 676f03760ca1d69c2470cef36c44dc152494b47c","Linux >= 71dc9ec9ac7d3eee785cdc986c3daeb821381e20 < 0dab92484474587b82e8e0455839eaf5ac7bf894","Linux >= 6.1.63 < 6.1.149","Linux 6.3"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:53:42.566432Z"},"published":"2025-09-05","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:02:30.928Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-39718","references":[{"url":"https://git.kernel.org/stable/c/969b06bd8b7560efb100a34227619e7d318fbe05"},{"url":"https://git.kernel.org/stable/c/ee438c492b2e0705d819ac0e25d04fae758d8f8f"},{"url":"https://git.kernel.org/stable/c/faf332a10372390ce65d0b803888f4b25a388335"},{"url":"https://git.kernel.org/stable/c/676f03760ca1d69c2470cef36c44dc152494b47c"},{"url":"https://git.kernel.org/stable/c/0dab92484474587b82e8e0455839eaf5ac7bf894"}],"tags":["cve.org"],"epss":0.00161,"epssPercentile":0.0523,"ingestedAt":"2026-10-15T22:48:25.521Z","slug":"CVE-2025-39718","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nvsock/virtio: Validate length in packet header before skb_put()\n\nWhen receiving a vsock packet in the guest, only the virtqueue buffer\nsize is validated prior to virtio_vsock_skb_rx_put(). Unfortunately,\nvirtio_vsock_skb_rx_put() uses the length from the packet header as the\nlength argument to skb_put(), potentially resulting in SKB overflow if\nthe host has gone wonky.\n\nValidate the length as advertised by the packet header before calling\nvirtio_vsock_skb_rx_put().\n\n## Affected\n\n- `Linux >= baddcc2c71572968cdaeee1c4ab3dc0ad90fa765 < 969b06bd8b7560efb100a34227619e7d318fbe05`\n- `Linux >= 71dc9ec9ac7d3eee785cdc986c3daeb821381e20 < ee438c492b2e0705d819ac0e25d04fae758d8f8f`\n- `Linux >= 71dc9ec9ac7d3eee785cdc986c3daeb821381e20 < faf332a10372390ce65d0b803888f4b25a388335`\n- `Linux >= 71dc9ec9ac7d3eee785cdc986c3daeb821381e20 < 676f03760ca1d69c2470cef36c44dc152494b47c`\n- `Linux >= 71dc9ec9ac7d3eee785cdc986c3daeb821381e20 < 0dab92484474587b82e8e0455839eaf5ac7bf894`\n- `Linux >= 6.1.63 < 6.1.149`\n- `Linux 6.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":46.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}