{"id":"CVE-2025-40170","title":"net: use dst_dev_rcu() in sk_setup_caps()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: use dst_dev_rcu() in sk_setup_caps()\n\nUse RCU to protect accesses to dst->dev from sk_setup_caps()\nand sk_dst_gso_max_size().\n\nAlso use dst_dev_rcu() in ip6_dst_mt…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 < 9f22b5f7f1a32f8bbcc82bf34e34ea63523fcd02","Linux >= 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 < 5d1be493d1110c9e720b4c51a6e587bb2fb4ac12","Linux >= 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 < a805729c0091073d8f0415cfa96c7acd1bc17a48","Linux >= 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 < 99a2ace61b211b0be861b07fbaa062fca4b58879","Linux 4.13"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-06-16T19:33:10.426175Z"},"published":"2025-11-12","updated":"2026-10-21","sourceUpdated":"2026-10-21T12:37:51.619Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-40170","references":[{"url":"https://git.kernel.org/stable/c/9f22b5f7f1a32f8bbcc82bf34e34ea63523fcd02"},{"url":"https://git.kernel.org/stable/c/5d1be493d1110c9e720b4c51a6e587bb2fb4ac12"},{"url":"https://git.kernel.org/stable/c/a805729c0091073d8f0415cfa96c7acd1bc17a48"},{"url":"https://git.kernel.org/stable/c/99a2ace61b211b0be861b07fbaa062fca4b58879"}],"tags":["cve.org"],"epss":0.00193,"epssPercentile":0.08947,"ingestedAt":"2026-10-21T12:48:53.682Z","slug":"CVE-2025-40170","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: use dst_dev_rcu() in sk_setup_caps()\n\nUse RCU to protect accesses to dst->dev from sk_setup_caps()\nand sk_dst_gso_max_size().\n\nAlso use dst_dev_rcu() in ip6_dst_mtu_maybe_forward(),\nand ip_dst_mtu_maybe_forward().\n\nip4_dst_hoplimit() can use dst_dev_net_rcu().\n\n## Affected\n\n- `Linux >= 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 < 9f22b5f7f1a32f8bbcc82bf34e34ea63523fcd02`\n- `Linux >= 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 < 5d1be493d1110c9e720b4c51a6e587bb2fb4ac12`\n- `Linux >= 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 < a805729c0091073d8f0415cfa96c7acd1bc17a48`\n- `Linux >= 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 < 99a2ace61b211b0be861b07fbaa062fca4b58879`\n- `Linux 4.13`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}