---
cve: "CVE-2024-50042"
severity: "LOW"
cvss: 3.1
epss: "21%"
vendor: "Linux"
kev: false
exploited: false
published: "2024-10-21 20:15:17"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-12T07:04:39+02:00"
---

# CVE-2024-50042

> 3.1 LOW

## Beschreibung

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

ice: Fix increasing MSI-X on VF

Increasing MSI-X value on a VF leads to invalid memory operations. This
is caused by not reallocating some arrays.

Reproducer:
  modprobe ice
  echo 0 > /sys/bus/pci/devices/$PF_PCI/sriov_drivers_autoprobe
  echo 1 > /sys/bus/pci/devices/$PF_PCI/sriov_numvfs
  echo 17 > /sys/bus/pci/devices/$VF0_PCI/sriov_vf_msix_count

Default MSI-X is 16, so 17 and above triggers this issue.

KASAN reports:

  BUG: KASAN: slab-out-of-bounds in ice_vsi_alloc_ring_stats+0x38d/0x4b0 [ice]
  Read of size 8 at addr ffff8888b937d180 by task bash/28433
  (...)

  Call Trace:
   (...)
   ? ice_vsi_alloc_ring_stats+0x38d/0x4b0 [ice]
   kasan_report+0xed/0x120
   ? ice_vsi_alloc_ring_stats+0x38d/0x4b0 [ice]
   ice_vsi_alloc_ring_stats+0x38d/0x4b0 [ice]
   ice_vsi_cfg_def+0x3360/0x4770 [ice]
   ? mutex_unlock+0x83/0xd0
   ? __pfx_ice_vsi_cfg_def+0x10/0x10 [ice]
   ? __pfx_ice_remove_vsi_lkup_fltr+0x10/0x10 [ice]
   ice_vsi_cfg+0x7f/0x3b0 [ice]
   ice_vf_reconfig_vsi+0x114/0x210 [ice]
   ice_sriov_set_msix_vec_count+0x3d0/0x960 [ice]
   sriov_vf_msix_count_store+0x21c/0x300
   (...)

  Allocated by task 28201:
   (...)
   ice_vsi_cfg_def+0x1c8e/0x4770 [ice]
   ice_vsi_cfg+0x7f/0x3b0 [ice]
   ice_vsi_setup+0x179/0xa30 [ice]
   ice_sriov_configure+0xcaa/0x1520 [ice]
   sriov_numvfs_store+0x212/0x390
   (...)

To fix it, use ice_vsi_rebuild() instead of ice_vf_reconfig_vsi(). This
causes the required arrays to be reallocated taking the new queue count
into account (ice_vsi_realloc_stat_arrays()). Set req_txq and req_rxq
before ice_vsi_rebuild(), so that realloc uses the newly set queue
count.

Additionally, ice_vsi_rebuild() does not remove VSI filters
(ice_fltr_remove_all()), so ice_vf_init_host_cfg() is no longer
necessary.

## Patch verfügbar (OSV)

- Kernel ≥ 6.11.4

## Referenzen

- <https://git.kernel.org/stable/c/cbda6197929418fabf0e45ecf9b7a76360944c70>
- <https://git.kernel.org/stable/c/bce9af1b030bf59d51bbabf909a3ef164787e44e>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2024-50042) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_