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CVE-2026-64136— smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()

CVSS 9.8 · Critical EPSS 0.50% · P39

Possible ATT&CK Techniques 1AI

T1205.001 · Port Knocking

Affected Version Matrix 17

VendorProductVersion RangeStatus
LinuxLinux953953abb66e52c224057ab91e404284fefeab62< 7df1df6f40c0720d30206aa35c0343b962350e0daffected
601dd3b79769b38d30b693c40afdb2a4b7edf9d0< 13fb413ae22a37c69341918a6d651d19a9b0b9b7affected
3969db6b22e3d90d8c5f22ac1a7fe0350a94c136< bf4ebdb19ff9b3cdf992b50715fe61633327416aaffected
96c4af418586ee9a6aab61738644366426e05316< e374f4e496fef8168784f93a4477d67be34485fdaffected
96c4af418586ee9a6aab61738644366426e05316< 4d8690dace005a38e6dbde9ecce2da3ad85c7c41affected
8c59eeeeffa1524ef57e173a89a1a3ff539888d5affected
6.6.128< 6.6.142affected
6.12.75< 6.12.92affected
… +9 more rows
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I. Basic Information for CVE-2026-64136

Vulnerability Information
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Vulnerability Title
smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
Source: NVD (National Vulnerability Database)
Vulnerability Description
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().
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于smb2_find_smb_sess_tcon_unlocked()函数中tc_count增量缺少锁定保护。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 953953abb66e52c224057ab91e404284fefeab62 ~ 7df1df6f40c0720d30206aa35c0343b962350e0d -
LinuxLinux 7.0 -

II. Public POCs for CVE-2026-64136

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III. Intelligence Information for CVE-2026-64136

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Patches & Fixes for CVE-2026-64136 (4)

Same Patch Batch · Linux · 2026-07-19 · 431 CVEs total

CVE-2026-6379510.0 CRITICAL9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-638009.8 CRITICALpNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-640559.8 CRITICALnet: ethernet: cortina: Carry over frag counter
CVE-2026-640569.8 CRITICALnet: ethernet: cortina: Make RX SKB per-port
CVE-2026-640619.8 CRITICALnetfs: Fix early put of sink folio in netfs_read_gaps()
CVE-2026-640669.8 CRITICALnetfs: Fix netfs_read_to_pagecache() to pause on subreq failure
CVE-2026-640679.8 CRITICALnetfs: Fix missing barriers when accessing stream->subrequests locklessly
CVE-2026-640689.8 CRITICALnetfs: Fix missing locking around retry adding new subreqs
CVE-2026-640699.8 CRITICALnetfs: Fix cancellation of a DIO and single read subrequests
CVE-2026-638089.8 CRITICALexfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-640899.8 CRITICALbatman-adv: tt: fix negative last_changeset_len
CVE-2026-641259.8 CRITICALnet: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-641429.8 CRITICALksmbd: close durable scavenger races against m_fp_list lookups
CVE-2026-533989.8 CRITICALNFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-641329.8 CRITICALipv6: ioam: refresh hdr pointer before ioam6_event()
CVE-2026-533999.8 CRITICALnfsd: release layout stid on setlease failure
CVE-2026-641139.8 CRITICALixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-640479.8 CRITICALnet: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring
CVE-2026-641029.8 CRITICALRDMA/siw: Reject MPA FPDU length underflow before signed receive math
CVE-2026-640919.8 CRITICALbatman-adv: tt: fix TOCTOU race for reported vlans

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64136

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