CVE-2023-54156 (GCVE-0-2023-54156)
Vulnerability from cvelistv5
Published
2025-12-24 13:07
Modified
2025-12-24 13:07
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: sfc: fix crash when reading stats while NIC is resetting efx_net_stats() (.ndo_get_stats64) can be called during an ethtool selftest, during which time nic_data->mc_stats is NULL as the NIC has been fini'd. In this case do not attempt to fetch the latest stats from the hardware, else we will crash on a NULL dereference: BUG: kernel NULL pointer dereference, address: 0000000000000038 RIP efx_nic_update_stats abridged calltrace: efx_ef10_update_stats_pf efx_net_stats dev_get_stats dev_seq_printf_stats Skipping the read is safe, we will simply give out stale stats. To ensure that the free in efx_ef10_fini_nic() does not race against efx_ef10_update_stats_pf(), which could cause a TOCTTOU bug, take the efx->stats_lock in fini_nic (it is already held across update_stats).
References
Impacted products
Vendor Product Version
Linux Linux Version: d3142c193dca9a2f6878f4128ce1aaf221bb3f99
Version: d3142c193dca9a2f6878f4128ce1aaf221bb3f99
Version: d3142c193dca9a2f6878f4128ce1aaf221bb3f99
Version: d3142c193dca9a2f6878f4128ce1aaf221bb3f99
Version: d3142c193dca9a2f6878f4128ce1aaf221bb3f99
Version: d3142c193dca9a2f6878f4128ce1aaf221bb3f99
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsfc: fix crash when reading stats while NIC is resetting\n\nefx_net_stats() (.ndo_get_stats64) can be called during an ethtool\n selftest, during which time nic_data-\u003emc_stats is NULL as the NIC has\n been fini\u0027d.  In this case do not attempt to fetch the latest stats\n from the hardware, else we will crash on a NULL dereference:\n    BUG: kernel NULL pointer dereference, address: 0000000000000038\n    RIP efx_nic_update_stats\n    abridged calltrace:\n    efx_ef10_update_stats_pf\n    efx_net_stats\n    dev_get_stats\n    dev_seq_printf_stats\nSkipping the read is safe, we will simply give out stale stats.\nTo ensure that the free in efx_ef10_fini_nic() does not race against\n efx_ef10_update_stats_pf(), which could cause a TOCTTOU bug, take the\n efx-\u003estats_lock in fini_nic (it is already held across update_stats)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T13:07:06.043Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/cb1aa7cc562cab6a87ea33574c8c65f2d2fd7aeb"
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        },
        {
          "url": "https://git.kernel.org/stable/c/d1b355438b8325a486f087e506d412c4e852f37b"
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      "title": "sfc: fix crash when reading stats while NIC is resetting",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54156",
    "datePublished": "2025-12-24T13:07:06.043Z",
    "dateReserved": "2025-12-24T13:02:52.530Z",
    "dateUpdated": "2025-12-24T13:07:06.043Z",
    "state": "PUBLISHED"
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  }
}


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