# CVE-2024-42071: linux: In the Linux kernel, the following vulnerability has been resolved:  ionic: use dev_consume_skb_any outside of napi...

CVE-2024-42071 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-42071, released July 29, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-42071
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 29, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  ionic: use dev_consume_skb_any outside of napi  If we're not in a NAPI softirq context, we need to be careful about how we call napi_consume_skb(), specifically we need to call it with budget==0 to signal to it that we're not in a safe context.  This was found while running some configuration stress testing of traffic and a change queue config loop running, and this curious note popped out:  [ 4371.402645] BUG: using smp_processor_id() in preemptible [00000000] code: ethtool/20545 [ 4371.402897] caller is napi_skb_cache_put+0x16/0x80 [ 4371.403120] CPU: 25 PID: 20545 Comm: ethtool Kdump: loaded Tainted: G           OE      6.10.0-rc3-netnext+ #8 [ 4371.403302] Hardware name: HPE ProLiant DL360 Gen10/ProLiant DL360 Gen10, BIOS U32 01/23/2021 [ 4371.403460] Call Trace: [ 4371.403613]  <TASK> [ 4371.403758]  dump_stack_lvl+0x4f/0x70 [ 4371.403904]  check_preemption_disabled+0xc1/0xe0 [ 4371.404051]  napi_skb_cache_put+0x16/0x80 [ 4371.404199]  ionic_tx_clean+0x18a/0x240 [ionic] [ 4371.404354]  ionic_tx_cq_service+0xc4/0x200 [ionic] [ 4371.404505]  ionic_tx_flush+0x15/0x70 [ionic] [ 4371.404653]  ? ionic_lif_qcq_deinit.isra.23+0x5b/0x70 [ionic] [ 4371.404805]  ionic_txrx_deinit+0x71/0x190 [ionic] [ 4371.404956]  ionic_reconfigure_queues+0x5f5/0xff0 [ionic] [ 4371.405111]  ionic_set_ringparam+0x2e8/0x3e0 [ionic] [ 4371.405265]  ethnl_set_rings+0x1f1/0x300 [ 4371.405418]  ethnl_default_set_doit+0xbb/0x160 [ 4371.405571]  genl_family_rcv_msg_doit+0xff/0x130 	[...]  I found that ionic_tx_clean() calls napi_consume_skb() which calls napi_skb_cache_put(), but before that last call is the note     /* Zero budget indicate non-NAPI context called us, like netpoll */ and     DEBUG_NET_WARN_ON_ONCE(!in_softirq());  Those are pretty big hints that we're doing it wrong.  We can pass a context hint down through the calls to let ionic_tx_clean() know what we're doing so it can call napi_consume_skb() correctly.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.9.8-1 | [DEBIAN-CVE-2024-42071](https://patchblox.com/security/data/fix/linux/debian-cve-2024-42071.md) | Jul 29, 2024 |
| Linux | linux Debian 14 | 6.9.8-1 | [DEBIAN-CVE-2024-42071](https://patchblox.com/security/data/fix/linux/debian-cve-2024-42071.md) | Jul 29, 2024 |

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