CVE-2026-31563

Technical Description

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

net: macb: Use dev_consume_skb_any() to free TX SKBs

The napi_consume_skb() function is not intended to be called in an IRQ

disabled context. However, after commit 6bc8a5098bf4 ("net: macb: Fix

tx_ptr_lock locking"), the freeing of TX SKBs is performed with IRQs

disabled. To resolve the following call trace, use dev_consume_skb_any()

for freeing TX SKBs:

WARNING: kernel/softirq.c:430 at __local_bh_enable_ip+0x174/0x188, CPU#0: ksoftirqd/0/15

Modules linked in:

CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 7.0.0-rc4-next-20260319-yocto-standard-dirty #37 PREEMPT

Hardware name: ZynqMP ZCU102 Rev1.1 (DT)

pstate: 200000c5 (nzCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)

pc : __local_bh_enable_ip+0x174/0x188

lr : local_bh_enable+0x24/0x38

sp : ffff800082b3bb10

x29: ffff800082b3bb10 x28: ffff0008031f3c00 x27: 000000000011ede0

x26: ffff000800a7ff00 x25: ffff800083937ce8 x24: 0000000000017a8

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