SB2026091932 - Infinite loop in Linux kernel block driver

Description

This security bulletin contains information about 1 vulnerability.

1) Infinite loop (CVE-ID: CVE-2026-90181)

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

CVSSv4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to cause a denial of service.

The vulnerability exists due to an infinite loop in __ublk_shmem_remove_ranges() when tearing down a registered SHMEM_ZC buffer during atomic xarray allocation failures. A local privileged user can trigger device teardown while failslab causes the required allocation failures to cause a denial of service.

The issue requires fault-injection support and a previously registered SHMEM_ZC buffer.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/4fd66a7f829f3f38f92a79081f0f2688aed644f0
• https://git.kernel.org/stable/c/b9cc6cc74daf6fef533dbe65d8cee779fea69600