CVE-2025-38359

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

s390/mm: Fix in_atomic() handling in do_secure_storage_access()

Kernel user spaces accesses to not exported pages in atomic context

incorrectly try to resolve the page fault.

With debug options enabled call traces like this can be seen:

BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1523

in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 419074, name: qemu-system-s39

preempt_count: 1, expected: 0

RCU nest depth: 0, expected: 0

INFO: lockdep is turned off.

Preemption disabled at:

[<00000383ea47cfa2>] copy_page_from_iter_atomic+0xa2/0x8a0

CPU: 12 UID: 0 PID: 419074 Comm: qemu-system-s39

Tainted: G W 6.16.0-20250531.rc0.git0.69b3a602feac.63.fc42.s390x+debug #1 PREEMPT

Tainted: [W]=WARN

Hardware name: IBM 3931 A01 703 (LPAR)

Call Trace:

[<00000383e990d282>] dump_stack_lvl+0xa2/0xe8

[<00000383e99bf152>] __might_resched+0x292/0x2d0

[<00000383eaa7c374>] down_read+0x34/0

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References