CVE-2026-64136
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().
CSIRTS triage
- What
- Multiple kernel vulnerabilities affect Red Hat Linux systems.
- Who is affected
- Red Hat Linux systems running affected kernel versions are vulnerable.
- Urgency
- Kernel vulnerabilities often enable privilege escalation; patch promptly.
- Action
- Apply Red Hat kernel security updates via package manager.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.49% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 40% of all EPSS-scored CVEs.
Advisory coverage (7)
- unknownRedHat Linux Kernel Multiple Vulnerabilitieshkcert · 2026-09-02
- unknownUSN-8664-1: Linux kernel (NVIDIA BaseOS) vulnerabilitiesubuntu · 2026-08-20
- unknownUSN-8663-1: Linux kernel (NVIDIA) vulnerabilitiesubuntu · 2026-08-20
- highUSN-8618-1: Linux kernel vulnerabilitiesubuntu · 2026-07-28
- highUSN-8603-1: Linux kernel (Azure) vulnerabilitiesubuntu · 2026-07-24
- highUSN-8593-1: Linux kernel vulnerabilitiesubuntu · 2026-07-23
- criticalCVE-2026-64136: In the Linux kernel, the following vulnerability has been resolved: smb: client: protect tc_co…nvd · 2026-07-19
External references
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