{"id":"CVE-2026-63919","title":"xfrm: input: hold netns during deferred transport reinjection","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: input: hold netns during deferred transport reinjection\n\nTransport-mode reinjection stores a struct net pointer in skb->cb and\nuses it later from xfrm_trans_reinj…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 7b3801927e52f8621de311277f7fc727635019e7 < 7ee59eda8820b758ed29e1cd3222359c7b97302c","Linux >= 7b3801927e52f8621de311277f7fc727635019e7 < 2df7059a18afb7d3aee6c36cad5d371c198111d4","Linux >= 7b3801927e52f8621de311277f7fc727635019e7 < 8dfabcba6a943a7a02ebe1e1637c361ba96acbaa","Linux >= 7b3801927e52f8621de311277f7fc727635019e7 < 48ce101cd630d6745b6923b5bad8358bc4c119da","Linux >= 7b3801927e52f8621de311277f7fc727635019e7 < 55ddfc41451f01c588089cd74957a05311b6f202","Linux >= 7b3801927e52f8621de311277f7fc727635019e7 < 9f7ebb45a83afc3216e855e57d51bb4bc9b5232e","Linux >= 7b3801927e52f8621de311277f7fc727635019e7 < 9f67a36e91bb50d358760f381f233913fe5c09f8","Linux >= 7b3801927e52f8621de311277f7fc727635019e7 < c16f74dc1d75d0e2e7670076d5375deda110ebeb","Linux 5.6"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:33:20.958476Z"},"published":"2026-07-19","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:42:11.562Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63919","references":[{"url":"https://git.kernel.org/stable/c/7ee59eda8820b758ed29e1cd3222359c7b97302c"},{"url":"https://git.kernel.org/stable/c/2df7059a18afb7d3aee6c36cad5d371c198111d4"},{"url":"https://git.kernel.org/stable/c/8dfabcba6a943a7a02ebe1e1637c361ba96acbaa"},{"url":"https://git.kernel.org/stable/c/48ce101cd630d6745b6923b5bad8358bc4c119da"},{"url":"https://git.kernel.org/stable/c/55ddfc41451f01c588089cd74957a05311b6f202"},{"url":"https://git.kernel.org/stable/c/9f7ebb45a83afc3216e855e57d51bb4bc9b5232e"},{"url":"https://git.kernel.org/stable/c/9f67a36e91bb50d358760f381f233913fe5c09f8"},{"url":"https://git.kernel.org/stable/c/c16f74dc1d75d0e2e7670076d5375deda110ebeb"}],"tags":["cve.org"],"epss":0.0065,"epssPercentile":0.50124,"ingestedAt":"2026-10-16T17:24:46.776Z","slug":"CVE-2026-63919","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: input: hold netns during deferred transport reinjection\n\nTransport-mode reinjection stores a struct net pointer in skb->cb and\nuses it later from xfrm_trans_reinject(). That pointer must stay valid\nuntil the deferred callback runs.\n\nTake a netns reference when queueing deferred reinjection work and drop\nit after the callback completes. Use maybe_get_net() so the queueing\npath does not revive a namespace that is already being torn down.\n\nThis keeps the existing workqueue design and fixes the netns lifetime\nhandling in one place for all users of xfrm_trans_queue_net().\n\n## Affected\n\n- `Linux >= 7b3801927e52f8621de311277f7fc727635019e7 < 7ee59eda8820b758ed29e1cd3222359c7b97302c`\n- `Linux >= 7b3801927e52f8621de311277f7fc727635019e7 < 2df7059a18afb7d3aee6c36cad5d371c198111d4`\n- `Linux >= 7b3801927e52f8621de311277f7fc727635019e7 < 8dfabcba6a943a7a02ebe1e1637c361ba96acbaa`\n- `Linux >= 7b3801927e52f8621de311277f7fc727635019e7 < 48ce101cd630d6745b6923b5bad8358bc4c119da`\n- `Linux >= 7b3801927e52f8621de311277f7fc727635019e7 < 55ddfc41451f01c588089cd74957a05311b6f202`\n- `Linux >= 7b3801927e52f8621de311277f7fc727635019e7 < 9f7ebb45a83afc3216e855e57d51bb4bc9b5232e`\n- `Linux >= 7b3801927e52f8621de311277f7fc727635019e7 < 9f67a36e91bb50d358760f381f233913fe5c09f8`\n- `Linux >= 7b3801927e52f8621de311277f7fc727635019e7 < c16f74dc1d75d0e2e7670076d5375deda110ebeb`\n- `Linux 5.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}