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            "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 vulnerability is reached through SIOCGMIIREG/SIOCSMIIREG ioctls issued on a local socket against a network device, via dev_ioctl() \u2192 dev_eth_ioctl() \u2192 phylink_mii_ioctl(). No network packet processing is involved, so this is local access only.\nAC:L - The attacker fully controls the 16-bit phy_id field and can deterministically select any out-of-bounds index from 32 to 65535, with no race, timing, or memory-layout condition outside their control; the OOB accounting happens on every call regardless of whether the underlying bus read/write succeeds.\nPR:L - The ioctl path is gated by ns_capable(net-\u003euser_ns, CAP_NET_ADMIN), which is namespace-relative rather than requiring real root \u2014 an unprivileged user who is root inside a user+network namespace that owns a C45-PHY-backed netdev (SR-IOV VF or DSA user port delegated to a container) satisfies it, so this is Low rather than High.\nUI:N - The attacker triggers the entire sequence themselves with a single ioctl() call; no victim action, mount, or file open is needed.\nS:U - The out-of-bounds access corrupts kernel heap memory from within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - mdiobus_stats_acct() performs a read-modify-write, so it reads 64-bit words at an attacker-chosen offset up to ~2 MB past the mii_bus allocation, and the resulting heap corruption can be groomed to modify length/index fields of adjacent objects to yield arbitrary kernel memory disclosure.\nI:H - The attacker gains a repeatable increment of two 64-bit words at a selectable 32-byte-granular offset far outside the allocation, which after heap grooming allows targeted modification of adjacent kernel objects (refcounts, sizes, pointer bytes) and is a viable path to control-flow hijack.\nA:H - Writing into unrelated slab objects and pages up to ~2 MB beyond the mii_bus allocation corrupts arbitrary kernel state and readily produces oopses, BUG_ONs, or a full panic, and the attacker can repeat it at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:59:37.382Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/abb0605ca00979a49572a6516f6db22c3dc57223"
        },
        {
          "url": "https://git.kernel.org/stable/c/31bf7b2b92563a352788cf9df3698682f659bacc"
        },
        {
          "url": "https://git.kernel.org/stable/c/4ded22f7f3ce9714ed72c3e9c68fea1cb9388ae7"
        },
        {
          "url": "https://git.kernel.org/stable/c/260388f79e94fb3026c419a208ece8358bb7b555"
        }
      ],
      "title": "net/mdiobus: Fix potential out-of-bounds clause 45 read/write access",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38110",
    "datePublished": "2025-07-03T08:35:19.928Z",
    "dateReserved": "2025-04-16T04:51:23.985Z",
    "dateUpdated": "2026-08-05T11:59:37.382Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}