SB20260812394 - Use-after-free in Linux kernel fscrypt_destroy_inline_crypt_key() and fscrypt_get_devices() in fs/crypto/inline_crypt.c

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Main Vulnerability Database SB20260812394

SB20260812394 - Use-after-free in Linux kernel fscrypt_destroy_inline_crypt_key() and fscrypt_get_devices() in fs/crypto/inline_crypt.c

Published: August 12, 2026

Security Bulletin ID SB20260812394
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-2026-68147)

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 fscrypt_destroy_inline_crypt_key() and fscrypt_get_devices() in fs/crypto/inline_crypt.c when evicting inline encryption keys for filesystem block devices. A local user can trigger key eviction during inode eviction under direct reclaim to cause a use-after-free.

The issue occurs when dynamic allocation of the block-device array fails, causing key memory to be freed without first evicting the key from all associated block devices.


Remediation

Install update from vendor's website.

References