{"id":"CVE-2026-43215","title":"cifs: Fix locking usage for tcon fields","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix locking usage for tcon fields\n\nWe used to use the cifs_tcp_ses_lock to protect a lot of objects\nthat are not just the server, ses or tcon lists. We later intr…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8 < 953953abb66e52c224057ab91e404284fefeab62","Linux >= d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8 < 601dd3b79769b38d30b693c40afdb2a4b7edf9d0","Linux >= d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8 < 3969db6b22e3d90d8c5f22ac1a7fe0350a94c136","Linux >= d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8 < 8c59eeeeffa1524ef57e173a89a1a3ff539888d5","Linux >= d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8 < 96c4af418586ee9a6aab61738644366426e05316","Linux 6.0"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:15:53.438726Z"},"published":"2026-05-06","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:20:37.159Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43215","references":[{"url":"https://git.kernel.org/stable/c/953953abb66e52c224057ab91e404284fefeab62"},{"url":"https://git.kernel.org/stable/c/601dd3b79769b38d30b693c40afdb2a4b7edf9d0"},{"url":"https://git.kernel.org/stable/c/3969db6b22e3d90d8c5f22ac1a7fe0350a94c136"},{"url":"https://git.kernel.org/stable/c/8c59eeeeffa1524ef57e173a89a1a3ff539888d5"},{"url":"https://git.kernel.org/stable/c/96c4af418586ee9a6aab61738644366426e05316"}],"tags":["cve.org"],"epss":0.00409,"epssPercentile":0.33581,"ingestedAt":"2026-10-16T17:24:46.688Z","slug":"CVE-2026-43215","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix locking usage for tcon fields\n\nWe used to use the cifs_tcp_ses_lock to protect a lot of objects\nthat are not just the server, ses or tcon lists. We later introduced\nsrv_lock, ses_lock and tc_lock to protect fields within the\ncorresponding structs. This was done to provide a more granular\nprotection and avoid unnecessary serialization.\n\nThere were still a couple of uses of cifs_tcp_ses_lock to provide\ntcon fields. In this patch, I've replaced them with tc_lock.\n\n## Affected\n\n- `Linux >= d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8 < 953953abb66e52c224057ab91e404284fefeab62`\n- `Linux >= d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8 < 601dd3b79769b38d30b693c40afdb2a4b7edf9d0`\n- `Linux >= d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8 < 3969db6b22e3d90d8c5f22ac1a7fe0350a94c136`\n- `Linux >= d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8 < 8c59eeeeffa1524ef57e173a89a1a3ff539888d5`\n- `Linux >= d7d7a66aacd6fd8ca57baf08a7bac5421282f6f8 < 96c4af418586ee9a6aab61738644366426e05316`\n- `Linux 6.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}