{"id":"CVE-2026-64136","summary":"smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()\n\nCommit 96c4af418586 (\"cifs: Fix locking usage for tcon fields\")\nrefactored cifs code to change cifs_tcp_ses_lock for tc_lock around\ntc_count changes.\n\nThere was missing lock around tc_count increment inside\nsmb2_find_smb_sess_tcon_unlocked().","modified":"2026-11-01T02:30:51.643030532Z","published":"2026-07-19T15:40:30.351Z","related":["ALSA-2026:61887","ALSA-2026:64808","SUSE-SU-2026:4120-1","SUSE-SU-2026:4254-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64136.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/13fb413ae22a37c69341918a6d651d19a9b0b9b7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4d8690dace005a38e6dbde9ecce2da3ad85c7c41"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7585d4242f59185b084957fa077396e53dbf7c24"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7df1df6f40c0720d30206aa35c0343b962350e0d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bf4ebdb19ff9b3cdf992b50715fe61633327416a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e374f4e496fef8168784f93a4477d67be34485fd"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64136.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64136"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"92d197ef7e9bb4994dae2bb17c2f19fa09d219a2"},{"fixed":"7585d4242f59185b084957fa077396e53dbf7c24"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"953953abb66e52c224057ab91e404284fefeab62"},{"fixed":"7df1df6f40c0720d30206aa35c0343b962350e0d"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"601dd3b79769b38d30b693c40afdb2a4b7edf9d0"},{"fixed":"13fb413ae22a37c69341918a6d651d19a9b0b9b7"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3969db6b22e3d90d8c5f22ac1a7fe0350a94c136"},{"fixed":"bf4ebdb19ff9b3cdf992b50715fe61633327416a"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"96c4af418586ee9a6aab61738644366426e05316"},{"fixed":"e374f4e496fef8168784f93a4477d67be34485fd"},{"fixed":"4d8690dace005a38e6dbde9ecce2da3ad85c7c41"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.128"},{"fixed":"6.6.142"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.12.75"},{"fixed":"6.12.92"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.18.16"},{"fixed":"6.18.34"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.19.6"},{"fixed":"6.20"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8c59eeeeffa1524ef57e173a89a1a3ff539888d5"}]}],"versions":["v6.6.141","v6.6.140","v6.6.139","v6.6.138","v6.6.137","v6.6.136","v6.6.135","v6.6.134","v6.6.133","v6.6.132","v6.6.131","v6.6.130","v6.6.129","v6.6.128","v6.12.91","v6.12.90","v6.12.89","v6.12.88","v6.12.87","v6.12.86","v6.12.85","v6.12.84","v6.12.83","v6.12.82","v6.12.81","v6.12.80","v6.12.79","v6.12.78","v6.12.77","v6.12.76","v6.12.75","v6.18.33","v6.18.32","v6.18.31","v6.18.30","v6.18.29","v6.18.28","v6.18.27","v6.18.26","v6.18.25","v6.18.24","v6.18.23","v6.18.22","v6.18.21","v6.18.20","v6.18.19","v6.18.18","v6.18.17","v6.18.16","v6.19.14","v6.19.13","v6.19.12","v6.19.11","v6.19.10","v6.19.9","v6.19.8","v6.19.7","v6.19.6"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64136.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.142"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.92"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.34"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64136.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}