CVE-2026-64136
criticalIn the Linux kernel, the following vulnerability has been resolved: smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked() Commit 96c4…
Vendor / product: Linux — linux kernel
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().
CVSS
9.8
9.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)
Timeline (UTC)
Published: 2026-07-19 16:17
Modified: 2026-10-30 13:19
NVD status: Modified
Last synced 1 day ago
Verified against the source API 2026-11-03 07:34 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
linux / linux_kernel ≥6.6.128 <6.6.142, ≥6.12.75 <6.12.92, ≥6.18.16 <6.18.34, ≥6.19.6 <7.0.11, 7.1
Weakness classification (CWE)
NVD-CWE-noinfo CWE-362
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Patch / mitigation: https://git.kernel.org/stable/c/13fb413ae22a37c69341918a6d651d19a9b0b9b7
Patch / mitigation: https://git.kernel.org/stable/c/4d8690dace005a38e6dbde9ecce2da3ad85c7c41
Patch / mitigation: https://git.kernel.org/stable/c/7df1df6f40c0720d30206aa35c0343b962350e0d
Patch / mitigation: https://git.kernel.org/stable/c/bf4ebdb19ff9b3cdf992b50715fe61633327416a
Patch / mitigation: https://git.kernel.org/stable/c/e374f4e496fef8168784f93a4477d67be34485fd
References
- https://git.kernel.org/stable/c/13fb413ae22a37c69341918a6d651d19a9b0b9b7 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/4d8690dace005a38e6dbde9ecce2da3ad85c7c41 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/7585d4242f59185b084957fa077396e53dbf7c24 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/7df1df6f40c0720d30206aa35c0343b962350e0d 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/bf4ebdb19ff9b3cdf992b50715fe61633327416a 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/e374f4e496fef8168784f93a4477d67be34485fd 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Data sources
NVD CVE API 2.0 — fetched 2026-11-03 07:34 UTC · record ↗