Bug 2502527 (CVE-2026-64136) - CVE-2026-64136 kernel: smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
Summary: CVE-2026-64136 kernel: smb: client: protect tc_count increment in smb2_find_s...
Keywords:
Status: NEW
Alias: CVE-2026-64136
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-19 17:04 UTC by OSIDB Bzimport
Modified: 2026-09-08 09:25 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:61887 0 None None None 2026-09-01 07:31:16 UTC
Red Hat Product Errata RHSA-2026:64808 0 None None None 2026-09-08 09:25:25 UTC

Description OSIDB Bzimport 2026-07-19 17:04:26 UTC 
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().
Comment 1 TEJ RATHI 2026-07-20 11:39:53 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026071928-CVE-2026-64136-5fb4@gregkh/T
Comment 5 errata-xmlrpc 2026-09-01 07:31:15 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:61887 https://access.redhat.com/errata/RHSA-2026:61887
Comment 6 errata-xmlrpc 2026-09-08 09:25:24 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:64808 https://access.redhat.com/errata/RHSA-2026:64808
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