CVE-2024-50042: ice: Fix increasing MSI-X on VF
First published: Mon Oct 21 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux kernel | >=6.7.10<6.8 | |
| Linux kernel | >=6.8<6.11.4 | |
| Linux kernel | =6.12-rc1 | |
| Linux kernel | =6.12-rc2 | |
| Linux Kernel | >=6.7.10<6.8 | |
| Linux Kernel | >=6.8<6.11.4 | |
| Linux Kernel | =6.12-rc1 | |
| Linux Kernel | =6.12-rc2 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.128-1 6.12.20-1 6.12.21-1 |
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Reference Links
- https://git.kernel.org/stable/c/cbda6197929418fabf0e45ecf9b7a76360944c70
- https://git.kernel.org/stable/c/bce9af1b030bf59d51bbabf909a3ef164787e44e
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50042
- https://nvd.nist.gov/vuln/detail/CVE-2024-50042
- https://launchpad.net/bugs/cve/CVE-2024-50042
- https://security-tracker.debian.org/tracker/CVE-2024-50042
- https://ubuntu.com/security/CVE-2024-50042
- https://git.kernel.org/linus/bce9af1b030bf59d51bbabf909a3ef164787e44e
Frequently Asked Questions
What is the severity of CVE-2024-50042?
CVE-2024-50042 is classified as a moderate severity vulnerability affecting the Linux kernel.
How do I fix CVE-2024-50042?
To fix CVE-2024-50042, update your Linux kernel to a version that addresses the issue, specifically versions 5.10.223-1, 5.10.226-1, 6.1.123-1, 6.1.128-1, 6.12.12-1, or 6.12.16-1.
Which Linux kernel versions are affected by CVE-2024-50042?
CVE-2024-50042 affects Linux kernel versions from 6.7.10 to 6.11.4 and also 6.12-rc1 and 6.12-rc2.
What type of vulnerability is CVE-2024-50042?
CVE-2024-50042 is a memory management vulnerability caused by incorrect handling of arrays in the ice driver within the Linux kernel.
Is a workaround available for CVE-2024-50042?
Currently, there are no specific workarounds suggested for CVE-2024-50042 other than applying the necessary updates.
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