Linux kernel CIFS use-after-free can escalate privileges locally
Original title: ZDI-26-836: Linux Kernel CIFS File System Use-After-Free Privilege Escalation Vulnerability
CVE-2026-72315 is rated CVSS 7.2 and requires the attacker to already run high-privileged code.
ZDI advisory ZDI-26-836 describes a use-after-free in the Linux kernel CIFS file system that allows local privilege escalation. The attacker must first be able to execute high-privileged code on the system. ZDI assigned CVSS 7.2 and CVE-2026-72315. No affected range, patch, or exploitation status is given.
Unconfirmed: Affected versions, a fix, and exploitation status are not stated.
- Tracked as CVE-2026-72315 and ZDI-26-836.
- ZDI assigned a CVSS rating of 7.2.
- The bug is a use-after-free in the CIFS file system.
- Exploitation requires existing high-privileged code execution.
Impact: Local privilege escalation on the Linux kernel
| Product | Affected |
|---|---|
| Linux Kernel | — |
- CVEs
- CVE-2026-72315
- Products
- Linux Kernel
- Organizations
- Zero Day Initiative
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2026-72315 | Linux kernel: smb: client: fix busy dentry warning on unmount after DIO | 7.8 | <1% |
From the original article
This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.
zerodayinitiative.com
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