CVE-2026-64136Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked() Commit 96c4af418586 ("cifs: Fix locking usage for tcon fields") refactored cifs code to c…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.5%
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
Commit 96c4af418586 ("cifs: Fix locking usage for tcon fields") refactored cifs code to change cifs_tcp_ses_lock for tc_lock around tc_count changes.
There was missing lock around tc_count increment inside smb2_find_smb_sess_tcon_unlocked().
Linux >= 953953abb66e52c224057ab91e404284fefeab62 < 7df1df6f40c0720d30206aa35c0343b962350e0dLinux >= 601dd3b79769b38d30b693c40afdb2a4b7edf9d0 < 13fb413ae22a37c69341918a6d651d19a9b0b9b7Linux >= 3969db6b22e3d90d8c5f22ac1a7fe0350a94c136 < bf4ebdb19ff9b3cdf992b50715fe61633327416aLinux >= 96c4af418586ee9a6aab61738644366426e05316 < e374f4e496fef8168784f93a4477d67be34485fdLinux >= 96c4af418586ee9a6aab61738644366426e05316 < 4d8690dace005a38e6dbde9ecce2da3ad85c7c41Linux 8c59eeeeffa1524ef57e173a89a1a3ff539888d5Linux >= 6.6.128 < 6.6.142Linux >= 6.12.75 < 6.12.92Linux >= 6.18.16 < 6.18.34Linux >= 6.19.6 < 6.20Linux 7.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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