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CVE-2026-64136

Updated on 19 Jul 2026

Severity

7.0 High severity

Details

CVSS score
7.0
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Links
NISTCIRCLRHELUbuntu

Overview

About vulnerability

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().

Details

Affected product:
AlmaLinux 9.2 ESU , TuxCare 9.6 ESU , TuxCare 9.8 ESU
Affected packages:
kernel @ 5.14.0 (+2 more)

Fixes

KernelCare state

Live-patch status from KernelCare for each operating system.

Operating system Status Covered kernels
AlmaLinux 10 Released
61 kernels
  • 6.12.0-55.27.1.el10_0
  • 6.12.0-55.28.1.el10_0
  • 6.12.0-55.29.1.el10_0
  • 6.12.0-55.30.1.el10_0
  • 6.12.0-55.31.1.el10_0
  • 6.12.0-55.32.1.el10_0
  • 6.12.0-55.33.1.el10_0
  • 6.12.0-55.34.1.el10_0
  • 6.12.0-55.37.1.el10_0
  • 6.12.0-55.38.1.el10_0
  • 6.12.0-55.39.1.el10_0
  • 6.12.0-55.40.1.el10_0
  • 6.12.0-55.42.1.el10_0
  • 6.12.0-55.43.1.el10_0
  • 6.12.0-124.8.1.el10_1
  • 6.12.0-124.13.1.el10_1
  • 6.12.0-124.16.1.el10_1
  • 6.12.0-124.20.1.el10_1
  • 6.12.0-124.21.1.el10_1
  • 6.12.0-124.27.1.el10_1
  • 6.12.0-124.28.1.el10_1
  • 6.12.0-124.29.1.el10_1
  • 6.12.0-124.31.1.el10_1
  • 6.12.0-124.35.1.el10_1
  • 6.12.0-124.38.1.el10_1
  • 6.12.0-124.39.1.el10_1
  • 6.12.0-124.43.1.el10_1
  • 6.12.0-124.45.1.el10_1
  • 6.12.0-124.47.1.el10_1
  • 6.12.0-124.49.1.el10_1
  • 6.12.0-124.52.1.el10_1
  • 6.12.0-124.55.1.el10_1
  • 6.12.0-124.40.1.el10_1
  • 6.12.0-124.52.2.el10_1
  • 6.12.0-124.52.3.el10_1
  • 6.12.0-211.7.1.el10_2
  • 6.12.0-211.7.3.el10_2
  • 6.12.0-124.56.5.el10_1
  • 6.12.0-124.55.3.el10_1
  • 6.12.0-211.20.1.el10_2
  • 6.12.0-211.18.1.el10_2
  • 6.12.0-211.16.1.el10_2
  • 6.12.0-211.22.1.el10_2
  • 6.12.0-211.26.1.el10_2
  • 6.12.0-211.28.1.el10_2
  • 6.12.0-211.29.1.el10_2
  • 6.12.0-211.30.1.el10_2
  • 6.12.0-211.31.1.el10_2
  • 6.12.0-211.32.1.el10_2
  • 6.12.0-211.7.4.el10_2
  • 6.12.0-211.33.1.el10_2
  • 6.12.0-211.34.1.el10_2
  • 6.12.0-211.37.1.el10_2
  • 6.12.0-211.38.1.el10_2
  • 6.12.0-211.39.1.el10_2
  • 6.12.0-211.40.1.el10_2
  • 6.12.0-211.43.1.el10_2
  • 6.12.0-211.44.1.el10_2
  • 6.12.0-211.46.1.el10_2
  • 6.12.0-211.47.1.el10_2
  • 6.12.0-211.49.1.el10_2
AlmaLinux 9 Released
26 kernels
  • 5.14.0-687.5.1.el9_8
  • 5.14.0-687.5.3.el9_8
  • 5.14.0-687.10.1.el9_8
  • 5.14.0-687.12.1.el9_8
  • 5.14.0-687.13.1.el9_8
  • 5.14.0-687.15.1.el9_8
  • 5.14.0-687.5.4.el9_8
  • 5.14.0-687.17.1.el9_8
  • 5.14.0-687.19.1.el9_8
  • 5.14.0-687.20.1.el9_8
  • 5.14.0-687.22.1.el9_8
  • 5.14.0-687.23.1.el9_8
  • 5.14.0-687.24.1.el9_8
  • 5.14.0-687.25.1.el9_8
  • 5.14.0-687.26.1.el9_8
  • 5.14.0-687.29.1.el9_8
  • 5.14.0-687.30.1.el9_8
  • 5.14.0-687.31.1.el9_8
  • 5.14.0-687.33.1.el9_8
  • 5.14.0-687.34.1.el9_8
  • 5.14.0-687.36.1.el9_8
  • 5.14.0-687.38.1.el9_8
  • 5.14.0-687.39.1.el9_8
  • 5.14.0-687.41.1.el9_8
  • 5.14.0-687.42.1.el9_8
  • 5.14.0-687.44.1.el9_8
Oracle Linux 10 Released
47 kernels
  • 6.12.0-55.27.1.0.1.el10_0
  • 6.12.0-55.28.1.0.1.el10_0
  • 6.12.0-55.29.1.0.1.el10_0
  • 6.12.0-55.30.1.0.1.el10_0
  • 6.12.0-55.31.1.0.1.el10_0
  • 6.12.0-55.32.1.0.1.el10_0
  • 6.12.0-55.33.1.0.1.el10_0
  • 6.12.0-55.34.1.0.1.el10_0
  • 6.12.0-55.37.1.0.1.el10_0
  • 6.12.0-55.38.1.0.1.el10_0
  • 6.12.0-55.39.1.0.1.el10_0
  • 6.12.0-55.40.1.0.1.el10_0
  • 6.12.0-55.41.1.0.1.el10_0
  • 6.12.0-55.42.1.0.1.el10_0
  • 6.12.0-55.43.1.0.1.el10_0
  • 6.12.0-124.8.1.el10_1
  • 6.12.0-124.13.1.el10_1
  • 6.12.0-124.16.1.el10_1
  • 6.12.0-124.20.1.el10_1
  • 6.12.0-124.21.1.el10_1
  • 6.12.0-124.27.1.el10_1
  • 6.12.0-124.28.1.el10_1
  • 6.12.0-124.29.1.el10_1
  • 6.12.0-124.31.1.el10_1
  • 6.12.0-124.35.1.el10_1
  • 6.12.0-124.38.1.el10_1
  • 6.12.0-124.39.1.el10_1
  • 6.12.0-124.40.1.el10_1
  • 6.12.0-124.43.1.el10_1
  • 6.12.0-124.45.1.el10_1
  • 6.12.0-124.47.1.el10_1
  • 6.12.0-124.49.1.el10_1
  • 6.12.0-124.52.1.el10_1
  • 6.12.0-124.55.1.el10_1
  • 6.12.0-124.56.1.el10_1
  • 6.12.0-211.7.3.el10_2
  • 6.12.0-211.34.1.el10_2
  • 6.12.0-211.37.1.el10_2
  • 6.12.0-211.38.1.el10_2
  • 6.12.0-211.39.1.el10_2
  • 6.12.0-211.40.1.el10_2
  • 6.12.0-211.42.1.el10_2
  • 6.12.0-211.43.1.el10_2
  • 6.12.0-211.44.1.el10_2
  • 6.12.0-211.46.1.el10_2
  • 6.12.0-211.47.1.el10_2
  • 6.12.0-211.49.1.el10_2
Oracle Linux 9 Released
20 kernels
  • 5.14.0-687.5.3.el9_8
  • 5.14.0-687.17.1.el9_8
  • 5.14.0-687.20.1.el9_8
  • 5.14.0-687.19.1.el9_8
  • 5.14.0-687.22.1.el9_8
  • 5.14.0-687.24.1.el9_8
  • 5.14.0-687.23.1.el9_8
  • 5.14.0-687.25.1.el9_8
  • 5.14.0-687.26.1.el9_8
  • 5.14.0-687.29.1.el9_8
  • 5.14.0-687.30.1.el9_8
  • 5.14.0-687.31.1.el9_8
  • 5.14.0-687.33.1.el9_8
  • 5.14.0-687.34.1.el9_8
  • 5.14.0-687.36.1.el9_8
  • 5.14.0-687.38.1.el9_8
  • 5.14.0-687.39.1.el9_8
  • 5.14.0-687.41.1.el9_8
  • 5.14.0-687.42.1.el9_8
  • 5.14.0-687.44.1.el9_8
RHEL 10 Released
61 kernels
  • 6.12.0-55.27.1.el10_0
  • 6.12.0-55.28.1.el10_0
  • 6.12.0-55.29.1.el10_0
  • 6.12.0-55.30.1.el10_0
  • 6.12.0-55.31.1.el10_0
  • 6.12.0-55.32.1.el10_0
  • 6.12.0-55.33.1.el10_0
  • 6.12.0-55.34.1.el10_0
  • 6.12.0-55.37.1.el10_0
  • 6.12.0-55.38.1.el10_0
  • 6.12.0-55.39.1.el10_0
  • 6.12.0-55.40.1.el10_0
  • 6.12.0-55.41.1.el10_0
  • 6.12.0-55.42.1.el10_0
  • 6.12.0-55.43.1.el10_0
  • 6.12.0-124.9.1.el10_1
  • 6.12.0-124.8.1.el10_1
  • 6.12.0-124.11.1.el10_1
  • 6.12.0-124.13.1.el10_1
  • 6.12.0-124.16.1.el10_1
  • 6.12.0-124.20.1.el10_1
  • 6.12.0-124.21.1.el10_1
  • 6.12.0-124.27.1.el10_1
  • 6.12.0-124.28.1.el10_1
  • 6.12.0-124.29.1.el10_1
  • 6.12.0-124.31.1.el10_1
  • 6.12.0-124.35.1.el10_1
  • 6.12.0-124.38.1.el10_1
  • 6.12.0-124.39.1.el10_1
  • 6.12.0-124.43.1.el10_1
  • 6.12.0-124.45.1.el10_1
  • 6.12.0-124.47.1.el10_1
  • 6.12.0-124.49.1.el10_1
  • 6.12.0-124.52.1.el10_1
  • 6.12.0-124.55.1.el10_1
  • 6.12.0-124.56.1.el10_1
  • 6.12.0-211.16.1.el10_2
  • 6.12.0-211.7.1.el10_2
  • 6.12.0-211.7.3.el10_2
  • 6.12.0-124.40.1.el10_1
  • 6.12.0-211.18.1.el10_2
  • 6.12.0-211.20.1.el10_2
  • 6.12.0-211.22.1.el10_2
  • 6.12.0-211.26.1.el10_2
  • 6.12.0-211.28.1.el10_2
  • 6.12.0-211.29.1.el10_2
  • 6.12.0-211.30.1.el10_2
  • 6.12.0-211.31.1.el10_2
  • 6.12.0-211.32.1.el10_2
  • 6.12.0-211.33.1.el10_2
  • 6.12.0-211.34.1.el10_2
  • 6.12.0-211.37.1.el10_2
  • 6.12.0-211.38.1.el10_2
  • 6.12.0-211.39.1.el10_2
  • 6.12.0-211.40.1.el10_2
  • 6.12.0-211.42.1.el10_2
  • 6.12.0-211.43.1.el10_2
  • 6.12.0-211.44.1.el10_2
  • 6.12.0-211.46.1.el10_2
  • 6.12.0-211.47.1.el10_2
  • 6.12.0-211.49.1.el10_2
RHEL 9 Released
25 kernels
  • 5.14.0-687.5.1.el9_8
  • 5.14.0-687.5.3.el9_8
  • 5.14.0-687.10.1.el9_8
  • 5.14.0-687.12.1.el9_8
  • 5.14.0-687.13.1.el9_8
  • 5.14.0-687.15.1.el9_8
  • 5.14.0-687.17.1.el9_8
  • 5.14.0-687.19.1.el9_8
  • 5.14.0-687.20.1.el9_8
  • 5.14.0-687.22.1.el9_8
  • 5.14.0-687.24.1.el9_8
  • 5.14.0-687.23.1.el9_8
  • 5.14.0-687.25.1.el9_8
  • 5.14.0-687.26.1.el9_8
  • 5.14.0-687.29.1.el9_8
  • 5.14.0-687.30.1.el9_8
  • 5.14.0-687.31.1.el9_8
  • 5.14.0-687.33.1.el9_8
  • 5.14.0-687.34.1.el9_8
  • 5.14.0-687.36.1.el9_8
  • 5.14.0-687.38.1.el9_8
  • 5.14.0-687.39.1.el9_8
  • 5.14.0-687.41.1.el9_8
  • 5.14.0-687.42.1.el9_8
  • 5.14.0-687.44.1.el9_8
Rocky Linux 10 Released
44 kernels
  • 6.12.0-55.27.1.el10_0
  • 6.12.0-55.29.1.el10_0
  • 6.12.0-55.30.1.el10_0
  • 6.12.0-55.32.1.el10_0
  • 6.12.0-55.34.1.el10_0
  • 6.12.0-55.37.1.el10_0
  • 6.12.0-55.39.1.el10_0
  • 6.12.0-55.40.1.el10_0
  • 6.12.0-55.41.1.el10_0
  • 6.12.0-124.8.1.el10_1
  • 6.12.0-124.13.1.el10_1
  • 6.12.0-124.16.1.el10_1
  • 6.12.0-124.20.1.el10_1
  • 6.12.0-124.21.1.el10_1
  • 6.12.0-124.27.1.el10_1
  • 6.12.0-124.28.1.el10_1
  • 6.12.0-124.29.1.el10_1
  • 6.12.0-124.31.1.el10_1
  • 6.12.0-124.35.1.el10_1
  • 6.12.0-124.38.1.el10_1
  • 6.12.0-124.45.1.el10_1
  • 6.12.0-124.47.1.el10_1
  • 6.12.0-124.49.1.el10_1
  • 6.12.0-124.52.1.el10_1
  • 6.12.0-124.55.1.el10_1
  • 6.12.0-124.56.1.el10_1
  • 6.12.0-124.40.1.el10_1
  • 6.12.0-211.18.1.el10_2
  • 6.12.0-211.22.1.el10_2
  • 6.12.0-211.26.1.el10_2
  • 6.12.0-211.28.1.el10_2
  • 6.12.0-211.32.1.el10_2
  • 6.12.0-211.16.1.el10_2.0.1
  • 6.12.0-211.33.1.el10_2
  • 6.12.0-211.34.1.el10_2
  • 6.12.0-211.37.1.el10_2
  • 6.12.0-211.39.1.el10_2
  • 6.12.0-211.40.1.el10_2
  • 6.12.0-211.42.1.el10_2
  • 6.12.0-211.43.1.el10_2
  • 6.12.0-211.44.1.el10_2
  • 6.12.0-211.46.1.el10_2
  • 6.12.0-211.47.1.el10_2
  • 6.12.0-211.49.1.el10_2
Rocky Linux 9 Released
19 kernels
  • 5.14.0-687.12.1.el9_8
  • 5.14.0-687.15.1.el9_8
  • 5.14.0-687.17.1.el9_8
  • 5.14.0-687.10.1.el9_8.0.1
  • 5.14.0-687.22.1.el9_8
  • 5.14.0-687.24.1.el9_8
  • 5.14.0-687.25.1.el9_8
  • 5.14.0-687.26.1.el9_8
  • 5.14.0-687.29.1.el9_8
  • 5.14.0-687.30.1.el9_8
  • 5.14.0-687.31.1.el9_8
  • 5.14.0-687.33.1.el9_8
  • 5.14.0-687.34.1.el9_8
  • 5.14.0-687.36.1.el9_8
  • 5.14.0-687.38.1.el9_8
  • 5.14.0-687.39.1.el9_8
  • 5.14.0-687.41.1.el9_8
  • 5.14.0-687.42.1.el9_8
  • 5.14.0-687.44.1.el9_8
Ubuntu 24.04 Planned —