CVE-2023-54156 (GCVE-0-2023-54156)
Vulnerability from cvelistv5
Published
2025-12-24 13:07
Modified
2026-08-05 09:17
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/sfc/ef10.c"
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "6.1.39",
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              "version": "6.3.13",
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              "lessThanOrEqual": "6.4.*",
              "status": "unaffected",
              "version": "6.4.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.188",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.121",
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "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)."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is reached only through local interfaces that read netdev statistics \u2014 /proc/net/dev, /sys/class/net/*/statistics/*, rtnetlink RTM_GETLINK, or ethtool -S \u2014 all requiring local access to the host. No remote peer can drive `.ndo_get_stats64`.\nAC:L - The attacker fully controls the read side and the vulnerable state persists for the entire duration of a reset or offline BIST selftest (seconds), so a simple polling loop hits it deterministically rather than winning a tight race; in a delegated-netns/SR-IOV deployment the attacker holds CAP_NET_ADMIN over the port and drives both sides (ethtool -t plus concurrent stats reads).\nPR:L - Reading /proc/net/dev or the sysfs statistics files requires no capability whatsoever, only an unprivileged local account; where the attacker also triggers the reset, CAP_NET_ADMIN over a namespace-delegated port is obtainable by an unprivileged user and counts as Low per kernel scoring guidance.\nUI:N - No victim action is needed \u2014 the attacker polls statistics continuously and the crash fires on the next reset, and in the strongest scenario the attacker initiates the reset themselves.\nS:U - The corruption and crash are confined to kernel memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The unsynchronized kfree lets `efx_nic_update_stats()` read a freed (and potentially reallocated) kmalloc-1k object and export its 16/32/64-bit contents to unprivileged userspace as network stat counters, disclosing freed kernel heap data; UAF read primitives are scored High.\nI:H - In the same race `efx_nic_copy_stats()` memcpy()s ~768 bytes of DMA\u0027d MAC counters into the freed buffer, repeating for up to 10 ms in its retry loop, giving a use-after-free write into a sprayable slab with counter values an attacker can influence by shaping traffic to the NIC.\nA:H - The documented outcome is a kernel NULL pointer dereference oops at 0x38 in `efx_nic_update_stats()`, taken while holding `spin_lock_bh(\u0026efx-\u003estats_lock)` \u2014 the lock is then never released, so every later stats reader spins with BH disabled, producing a hang on top of the oops (or an immediate panic where panic_on_oops is set)."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:17:42.126Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cb1aa7cc562cab6a87ea33574c8c65f2d2fd7aeb"
        },
        {
          "url": "https://git.kernel.org/stable/c/91f4ef204e731565afdc6c2a7fcf509a3fd6fd67"
        },
        {
          "url": "https://git.kernel.org/stable/c/446f5567934331923d0aec4ce045e4ecb0174aae"
        },
        {
          "url": "https://git.kernel.org/stable/c/470152d76b3ed107d172ea46acc4bfa941f20b4b"
        },
        {
          "url": "https://git.kernel.org/stable/c/aba32b4c58112960c0c708703ca6b44dc8944082"
        },
        {
          "url": "https://git.kernel.org/stable/c/d1b355438b8325a486f087e506d412c4e852f37b"
        }
      ],
      "title": "sfc: fix crash when reading stats while NIC is resetting",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54156",
    "datePublished": "2025-12-24T13:07:06.043Z",
    "dateReserved": "2025-12-24T13:02:52.530Z",
    "dateUpdated": "2026-08-05T09:17:42.126Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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