CVE-2023-5345

Use-after-free in Linux kernel's fs/smb/client component

HIGH
7.8
CVSS Score
Published: October 3, 2023 at 02:33 AM UTC
Updated: June 17, 2026 at 06:48 AM UTC
2 products affected across 2 vendorsLinux KernelFedora

Using Kernel by Linux?

Get instant alerts when new vulnerabilities affect Kernel - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Severity
HIGH7.8
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

A use-after-free vulnerability in the Linux kernel's fs/smb/client component can be exploited to achieve local privilege escalation. In case of an error in smb3_fs_context_parse_param, ctx->password was freed but the field was not set to NULL which could lead to double free. We recommend upgrading past commit e6e43b8aa7cd3c3af686caf0c2e11819a886d705.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

0.0 ≤ v < 6.66.0.16 ≤ v < 6.1.566.2 ≤ v < 6.5.60.06.6 rc16.6 rc26.6 rc3
Affected range stops below 6.1.56, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.5.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHGoogle
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-416

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Free plan, no card