CVE-2025-39814
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-16

Last updated on: 2025-12-02

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: ice: fix NULL pointer dereference in ice_unplug_aux_dev() on reset Issuing a reset when the driver is loaded without RDMA support, will results in a crash as it attempts to remove RDMA's non-existent auxbus device: echo 1 > /sys/class/net/<if>/device/reset BUG: kernel NULL pointer dereference, address: 0000000000000008 ... RIP: 0010:ice_unplug_aux_dev+0x29/0x70 [ice] ... Call Trace: <TASK> ice_prepare_for_reset+0x77/0x260 [ice] pci_dev_save_and_disable+0x2c/0x70 pci_reset_function+0x88/0x130 reset_store+0x5a/0xa0 kernfs_fop_write_iter+0x15e/0x210 vfs_write+0x273/0x520 ksys_write+0x6b/0xe0 do_syscall_64+0x79/0x3b0 entry_SYSCALL_64_after_hwframe+0x76/0x7e ice_unplug_aux_dev() checks pf->cdev_info->adev for NULL pointer, but pf->cdev_info will also be NULL, leading to the deref in the trace above. Introduce a flag to be set when the creation of the auxbus device is successful, to avoid multiple NULL pointer checks in ice_unplug_aux_dev().
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Meta Information
Published
2025-09-16
Last Modified
2025-12-02
Generated
2026-06-16
AI Q&A
2025-09-16
EPSS Evaluated
2026-06-15
NVD
CVE-2025-39814
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 6.16 (inc) to 6.16.5 (exc)
linux linux_kernel 6.17
linux linux_kernel 6.17
linux linux_kernel 6.17
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
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Executive Summary

This vulnerability is a NULL pointer dereference in the Linux kernel's ice driver, specifically in the function ice_unplug_aux_dev() during a device reset. When the driver is loaded without RDMA support, issuing a reset causes the driver to attempt to remove a non-existent RDMA auxiliary bus device, leading to a crash due to dereferencing a NULL pointer.

Impact Analysis

This vulnerability can cause the Linux kernel to crash when resetting the network device managed by the ice driver without RDMA support. This results in a denial of service as the system or network interface may become unstable or unresponsive.

Detection Guidance

This vulnerability can be detected by observing kernel crash logs indicating a NULL pointer dereference in the ice_unplug_aux_dev() function. Specifically, look for kernel BUG messages and call traces involving ice_unplug_aux_dev, ice_prepare_for_reset, and pci_reset_function. You can also test the vulnerability by issuing the command: echo 1 > /sys/class/net/<if>/device/reset (replace <if> with the network interface name) on a system running the affected driver without RDMA support, which may cause a crash if vulnerable.

Mitigation Strategies

Immediate mitigation involves avoiding issuing a reset command (echo 1 > /sys/class/net/<if>/device/reset) on interfaces using the ice driver without RDMA support until the driver is updated with the fix. Applying the vendor or kernel update that includes the patch introducing a flag to prevent NULL pointer dereference in ice_unplug_aux_dev() is the recommended permanent fix.

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