CVE-2025-39731

Technical Description

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

f2fs: vm_unmap_ram() may be called from an invalid context

When testing F2FS with xfstests using UFS backed virtual disks the

kernel complains sometimes that f2fs_release_decomp_mem() calls

vm_unmap_ram() from an invalid context. Example trace from

f2fs/007 test:

f2fs/007 5s ... [12:59:38][ 8.902525] run fstests f2fs/007

[ 11.468026] BUG: sleeping function called from invalid context at mm/vmalloc.c:2978

[ 11.471849] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 68, name: irq/22-ufshcd

[ 11.475357] preempt_count: 1, expected: 0

[ 11.476970] RCU nest depth: 0, expected: 0

[ 11.478531] CPU: 0 UID: 0 PID: 68 Comm: irq/22-ufshcd Tainted: G W 6.16.0-rc5-xfstests-ufs-g40f92e79b0aa #9 PREEMPT(none)

[ 11.478535] Tainted: [W]=WARN

[ 11.478536] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014

[ 11.478537] Call Trace:

[ 11.478543] <TASK>

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

References