CVE-2026-31563
net: macb: Use dev_consume_skb_any() to free TX SKBs
Reported by linux · Published April 24, 2026
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: 0000000000017a80 x23: ffff000803243a78 x22: 0000000000000040 x21: 0000000000000000 x20: ffff000800394c80 x19: 0000000000000200 x18: 0000000000000001 x17: 0000000000000001 x16: ffff000803240000 x15: 0000000000000000 x14: ffffffffffffffff x13: 0000000000000028 x12: ffff000800395650 x11: ffff8000821d1528 x10: ffff800081c2bc08 x9 : ffff800081c1e258 x8 : 0000000100000301 x7 : ffff8000810426ec x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000008 x1 : 0000000000000200 x0 : ffff8000810428dc Call trace: __local_bh_enable_ip+0x174/0x188 (P) local_bh_enable+0x24/0x38 skb_attempt_defer_free+0x190/0x1d8 napi_consume_skb+0x58/0x108 macb_tx_poll+0x1a4/0x558 __napi_poll+0x50/0x198 net_rx_action+0x1f4/0x3d8 handle_softirqs+0x16c/0x560 run_ksoftirqd+0x44/0x80 smpboot_thread_fn+0x1d8/0x338 kthread+0x120/0x150 ret_from_fork+0x10/0x20 irq event stamp: 29751 hardirqs last enabled at (29750): [<ffff8000813be184>] _raw_spin_unlock_irqrestore+0x44/0x88 hardirqs last disabled at (29751): [<ffff8000813bdf60>] _raw_spin_lock_irqsave+0x38/0x98 softirqs last enabled at (29150): [<ffff8000800f1aec>] handle_softirqs+0x504/0x560 softirqs last disabled at (29153): [<ffff8000800f2fec>] run_ksoftirqd+0x44/0x80
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| Linux | Linux | f4bc91398b579730284328322365afa77a9d568f, 984350b37372f79f71d4f0a5264c640e40daf9ce, 92e7081f0c79d9073087e54bab745bb184192c2e, 78c8b090a3d5c1689dc989861b0163180db2b3f8, 647b8a2fe474474704110db6bd07f7a139e621eb, 6.6.131 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | aeeafeb29b1b270302a9a85a13f7d70a68a3b9e6, 5430388a81113e62a2d48b5d7dc1e76231908ebf, 7db8aa3fc4ed0a2928246747b2514b0741a8187e |
| Linux | Linux | 6.17, 0, 6.1.168 |
| Linux | Linux | 6.16.6, 7db8aa3fc4ed0a2928246747b2514b0741a8187e, 6bc8a5098bf4a365c4086a4a4130bfab10a58260 |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | 3.1.5, 3.1.7, 3.1.6 |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | 3.1.5, 3.1.7, 3.1.6 |
| linux | linux_kernel | 6.17, 6.16.6, 6.1.151 |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | 3.1.6, 3.1.7, 3.1.5 |
Timeline
- Apr 24, 2026 CVE Published
- Apr 24, 2026 Security Advisory (102 in total, the first dated here)
- May 18, 2026 EPSS Score (30 in total, the first dated here)
- Jul 18, 2026 Coalition ESS Score
- Aug 11, 2026 Distribution Patch (97 in total, the first dated here)
- Oct 15, 2026 CVE Updated
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