SB20260912212 - Missing Release of Resource after Effective Lifetime in Linux kernel md driver

Description

This security bulletin contains information about 1 vulnerability.

1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-89576)

CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service through metadata block exhaustion.

The vulnerability exists due to improper resource release in metadata_take_snap() when incrementing metadata block references fails after allocating a shadow superblock. A local user can cause snapshot creation to fail after a shadow block is allocated to cause a denial of service through metadata block exhaustion.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/36ff918637e3517f732188a3c39dbeae5b9cfb1b
• https://git.kernel.org/stable/c/39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713
• https://git.kernel.org/stable/c/6876ca330e741fb8886d12070cb6a7f9cb67257e
• https://git.kernel.org/stable/c/d66ceeefb87ddb097b0546bafc581380b816b048