SB20261029180 - Infinite loop in Linux kernel md driver

Description

This security bulletin contains information about 1 vulnerability.

1) Infinite loop (CVE-ID: CVE-2026-99135)

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/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 denial of service by triggering an infinite loop during discard processing.

The vulnerability exists due to an incorrect fallback buffer size calculation in the dm-integrity integrity_metadata() function when processing discard requests after a memory allocation failure. A local user can trigger discard processing on a device configured with a tag size greater than HASH_MAX_DIGESTSIZE to cause max_blocks to become zero, preventing bi_size from decreasing and causing an infinite loop.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/18d80c77b4c7dd20699e81cedfbbff4e9d198f28
• https://git.kernel.org/stable/c/251b44b424920df9204e88a81fb3f78fa48ddd99
• https://git.kernel.org/stable/c/fc512700f1413fed652dac22fa1c4e837210b9c0