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Linux Kernel CVE-2025-38485

HIGH
Use After Free (CWE-416)
2025-07-28 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Denial Of Service Linux Use After Free Memory Corruption Debian Red Hat Debian Linux Suse
7.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
4.7 MEDIUM

Timing-dependent race gives AC:H; local toggling of buffer mode needs some access so PR:L; observed impact is a kernel crash, so A:H only with C/I:N.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0 AV:L/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
7.0 HIGH
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 30, 2026 - 08:17 vuln.today
CVE Published
Jul 28, 2025 - 12:15 nvd
HIGH 7.8

DescriptionNVD

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

iio: accel: fxls8962af: Fix use after free in fxls8962af_fifo_flush

fxls8962af_fifo_flush() uses indio_dev->active_scan_mask (with iio_for_each_active_channel()) without making sure the indio_dev stays in buffer mode. There is a race if indio_dev exits buffer mode in the middle of the interrupt that flushes the fifo. Fix this by calling synchronize_irq() to ensure that no interrupt is currently running when disabling buffer mode.

Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read [...] _find_first_bit_le from fxls8962af_fifo_flush+0x17c/0x290 fxls8962af_fifo_flush from fxls8962af_interrupt+0x80/0x178 fxls8962af_interrupt from irq_thread_fn+0x1c/0x7c irq_thread_fn from irq_thread+0x110/0x1f4 irq_thread from kthread+0xe0/0xfc kthread from ret_from_fork+0x14/0x2c

AnalysisAI

Use-after-free in the Linux kernel's IIO FXLS8962AF/FXLS8964AF accelerometer driver (fxls8962af_fifo_flush) lets a race between FIFO-flush interrupt handling and buffer-mode teardown dereference a freed/NULL active_scan_mask, crashing the kernel. Affects systems running a vulnerable kernel (notably 6.16-rc1 through rc6 and backport-affected stable branches) that use the NXP fxls8962af IIO accelerometer. A vendor fix is available; there is no public exploit identified at time of analysis and EPSS exploitation probability is low (0.15%).

Technical ContextAI

The affected component is the Linux Industrial I/O (IIO) subsystem driver for NXP FXLS8962AF/FXLS8964AF 3-axis accelerometers. In buffered capture mode the driver's threaded IRQ handler calls fxls8962af_fifo_flush(), which iterates over indio_dev->active_scan_mask via iio_for_each_active_channel(). The root cause maps to CWE-416 (Use After Free): nothing guarantees the device remains in buffer mode while the flush runs, so if the device exits buffer mode concurrently, active_scan_mask is torn down while the interrupt thread is still reading it, producing a NULL pointer dereference in _find_first_bit_le (per the kernel oops trace). The fix adds a synchronize_irq() call so no interrupt thread is running when buffer mode is disabled. Per CPE data the affected product is cpe:2.3:o:linux:linux_kernel, with 6.16 release-candidate builds (rc1-rc6) explicitly enumerated alongside earlier ranges carrying the same code.

RemediationAI

Patch available per vendor advisory: upgrade to a Linux kernel build that includes the fxls8962af synchronize_irq() fix, applying your distribution's stable update (the fix is carried in the mainline/stable commits at https://git.kernel.org/stable/c/dda42f23a8f5439eaac9521ce0531547d880cc54, .../6ecd61c201b27ad2760b3975437ad2b97d725b98, .../1803d372460aaa9ae0188a30c9421d3f157f2f04, .../1fe16dc1a2f5057772e5391ec042ed7442966c9a, and .../bfcda3e1015791b3a63fb4d3aad408da9cf76e8f); Debian users should follow https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html. Because an exact tagged release number is not provided in the input, confirm the fixed version against your distribution's changelog rather than assuming one. If immediate patching is not possible, the practical compensating control is to avoid loading/using the vulnerable driver where the hardware is not needed - blacklist the fxls8962af kernel module (trade-off: disables the accelerometer entirely) - and restrict local access to the IIO sysfs/buffer controls to trusted users, since triggering requires local ability to toggle buffer mode (trade-off: may break userspace apps that legitimately manage the sensor).

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
Container suse/hpc/warewulf4-x86_64/sle-hpc-node:15.6.17.8.103 Image SLES15-SP6 Image SLES15-SP6-BYOS Image SLES15-SP6-BYOS-Azure Image SLES15-SP6-BYOS-EC2 Image SLES15-SP6-BYOS-GCE Image SLES15-SP6-CHOST-BYOS Image SLES15-SP6-CHOST-BYOS-Aliyun Image SLES15-SP6-CHOST-BYOS-Azure Image SLES15-SP6-CHOST-BYOS-EC2 Image SLES15-SP6-CHOST-BYOS-GCE Image SLES15-SP6-CHOST-BYOS-GDC Image SLES15-SP6-CHOST-BYOS-SAP-CCloud Image SLES15-SP6-EC2 Image SLES15-SP6-EC2-ECS-HVM Image SLES15-SP6-GCE Image SLES15-SP6-HPC-BYOS Image SLES15-SP6-HPC-BYOS-Azure Image SLES15-SP6-HPC-BYOS-EC2 Image SLES15-SP6-HPC-BYOS-GCE Image SLES15-SP6-HPC-EC2 Image SLES15-SP6-HPC-GCE Image SLES15-SP6-Hardened-BYOS Image SLES15-SP6-Hardened-BYOS-Azure Image SLES15-SP6-Hardened-BYOS-EC2 Image SLES15-SP6-Hardened-BYOS-GCE Image SLES15-SP6-SAP Image SLES15-SP6-SAP-Azure Image SLES15-SP6-SAP-EC2 Image SLES15-SP6-SAP-GCE Image SLES15-SP6-SAPCAL Image SLES15-SP6-SAPCAL-Azure Image SLES15-SP6-SAPCAL-EC2 Image SLES15-SP6-SAPCAL-GCE Affected
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.44 Container suse/sl-micro/6.1/base-os-container:2.2.1-5.27 Image SL-Micro Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-EC2 Image SLE-Micro Image SLE-Micro-Azure Image SLE-Micro-BYOS Image SLE-Micro-BYOS-Azure Image SLE-Micro-BYOS-EC2 Image SLE-Micro-BYOS-GCE Image SLE-Micro-EC2 Image SLE-Micro-GCE Image SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-Azure-llc Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-Azure Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected
Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.67 Container suse/sl-micro/6.1/kvm-os-container:2.2.1-5.29 Affected
Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.76 Container suse/sl-micro/6.1/rt-os-container:2.2.1-5.14 Affected
Image SLES-Azure-3P Image SLES-Azure-Basic Image SLES-Azure-Standard Image SLES-BYOS-Azure Image SLES-BYOS-EC2 Image SLES-BYOS-GCE Image SLES-CHOST-BYOS-Aliyun Image SLES-CHOST-BYOS-Azure Image SLES-CHOST-BYOS-EC2 Image SLES-CHOST-BYOS-GCE Image SLES-CHOST-BYOS-GDC Image SLES-CHOST-BYOS-SAP-CCloud Image SLES-EC2 Image SLES-EC2-ECS Image SLES-GCE Image SLES-GCE-3P Image SLES-Hardened-BYOS-Azure Image SLES-Hardened-BYOS-EC2 Image SLES-Hardened-BYOS-GCE Image SLES-SAPCAL-Azure Image SLES-SAPCAL-EC2 Image SLES-SAPCAL-GCE Affected

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CVE-2025-38485 vulnerability details – vuln.today
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