SB20260812395 - Use-after-free in Linux kernel crypto

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Main Vulnerability Database SB20260812395

SB20260812395 - Use-after-free in Linux kernel crypto

Published: August 12, 2026

Security Bulletin ID SB20260812395
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-68148)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a use-after-free.

The vulnerability exists due to a use-after-free in find_or_insert_direct_key() when reusing cached direct keys for inodes from different super_blocks. A local user can cause different super_blocks to reference the same cached direct key to cause a use-after-free.

The issue affects the legacy fscrypt_direct_keys table used by v1 encryption policies with FSCRYPT_POLICY_FLAG_DIRECT_KEY, while the v2 policy equivalent is not affected.


Remediation

Install update from vendor's website.

References