CVE-2026-53199 (GCVE-0-2026-53199)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-08-05 12:34
VLAI
Title
hv_netvsc: use kmap_local_page in netvsc_copy_to_send_buf
Summary
In the Linux kernel, the following vulnerability has been resolved: hv_netvsc: use kmap_local_page in netvsc_copy_to_send_buf netvsc_copy_to_send_buf() copies page buffer entries into the VMBus send buffer using phys_to_virt() on the entry PFN. Entries for the RNDIS header and the skb linear data come from kmalloc'd memory and are always in the kernel direct map, but entries for skb fragments reference page cache or user pages, which on 32-bit x86 with CONFIG_HIGHMEM=y can live above the LOWMEM boundary. For such a page phys_to_virt() returns an address outside the direct map and the subsequent memcpy() faults on the transmit softirq path, which is fatal. Map the pages with kmap_local_page() instead, handling two properties of the page buffer entries: - pb[i].pfn is a Hyper-V PFN at HV_HYP_PAGE_SIZE (4K) granularity, not a native PFN. Reconstruct the physical address first and derive the native page from it, so the mapping stays correct where PAGE_SIZE > HV_HYP_PAGE_SIZE (e.g. arm64 with 64K pages). - Since commit 41a6328b2c55 ("hv_netvsc: Preserve contiguous PFN grouping in the page buffer array"), an entry describes a full physically contiguous fragment and pb[i].len can exceed PAGE_SIZE, while kmap_local_page() maps a single page. Copy page by page, splitting at native page boundaries. The copy path only handles packets smaller than the send section size (6144 bytes by default); larger packets take the cp_partial path where only the RNDIS header is copied. So entries here are bounded by the section size and a copy is split at most once on 4K-page systems. On !CONFIG_HIGHMEM configs kmap_local_page() folds to page_address() and no mapping work is added.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e , < 16514afeb7d3d121072ba9a0b640d6c1c5507db0 (git)
Affected: c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e , < a82d4251918f37d9c5aab7b365157669fb885ec3 (git)
Affected: c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e , < 695c59cf7bf707e6ff8cea01916ee50e86616933 (git)
Affected: c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e , < 09b8a7aa5a341bb345dc492aac139525efa13515 (git)
Affected: c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e , < 918c0c988239aa5ab96b254e504d191af6191061 (git)
Affected: c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e , < 0b38870d81ab3a04c1ab0598d9d3285f5d9d0584 (git)
Affected: c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e , < fe7221b4346418d27ec2daccfc09df6692b76f0b (git)
Affected: c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e , < 004e9ecfe6c5384f9e0b2f6f6389d42ec22789af (git)
Create a notification for this product.
Linux Linux Affected: 3.16
Unaffected: 0 , < 3.16 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/hyperv/netvsc.c"
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          "vendor": "Linux",
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              "version": "0",
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              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
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              "status": "unaffected",
              "version": "7.0.13",
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              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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                  "versionEndExcluding": "5.10.259",
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              "operator": "OR"
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          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhv_netvsc: use kmap_local_page in netvsc_copy_to_send_buf\n\nnetvsc_copy_to_send_buf() copies page buffer entries into the VMBus\nsend buffer using phys_to_virt() on the entry PFN. Entries for the\nRNDIS header and the skb linear data come from kmalloc\u0027d memory and\nare always in the kernel direct map, but entries for skb fragments\nreference page cache or user pages, which on 32-bit x86 with\nCONFIG_HIGHMEM=y can live above the LOWMEM boundary. For such a page\nphys_to_virt() returns an address outside the direct map and the\nsubsequent memcpy() faults on the transmit softirq path, which is\nfatal.\n\nMap the pages with kmap_local_page() instead, handling two properties\nof the page buffer entries:\n\n - pb[i].pfn is a Hyper-V PFN at HV_HYP_PAGE_SIZE (4K) granularity,\n   not a native PFN. Reconstruct the physical address first and derive\n   the native page from it, so the mapping stays correct where\n   PAGE_SIZE \u003e HV_HYP_PAGE_SIZE (e.g. arm64 with 64K pages).\n\n - Since commit 41a6328b2c55 (\"hv_netvsc: Preserve contiguous PFN\n   grouping in the page buffer array\"), an entry describes a full\n   physically contiguous fragment and pb[i].len can exceed PAGE_SIZE,\n   while kmap_local_page() maps a single page. Copy page by page,\n   splitting at native page boundaries.\n\nThe copy path only handles packets smaller than the send section size\n(6144 bytes by default); larger packets take the cp_partial path where\nonly the RNDIS header is copied. So entries here are bounded by the\nsection size and a copy is split at most once on 4K-page systems. On\n!CONFIG_HIGHMEM configs kmap_local_page() folds to page_address() and\nno mapping work is added."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - An unauthenticated remote peer can induce a Hyper-V guest providing a network service to transmit TCP responses through hv_netvsc, reaching the normal netdev transmit path and netvsc_copy_to_send_buf. No local ioctl or device-file access is required in that reasonable deployment.\nAC:L - The fault is deterministic once a small send-buffer-copied skb contains a highmem-backed fragment, which ordinary TCP/file-send paths can create on affected 32-bit HIGHMEM guests. Any uncertainty about allocation timing is resolved toward Low because the attacker can repeatedly trigger outbound sends.\nPR:N - In the remote-service scenario, the attacker needs only network access to the exposed service and no account or kernel capabilities on the guest. The driver path itself performs no privilege check.\nUI:N - No victim action is required beyond the target system already running with the Hyper-V netvsc interface and serving network traffic. The attacker triggers transmission by sending network requests.\nS:U - The impact is within the vulnerable guest kernel and its networking stack. The bug does not cross into the Hyper-V host or another security authority.\nC:N - The vulnerable operation is an invalid source mapping from phys_to_virt for a highmem page, and the documented effect is a fault in memcpy. I found no credible primitive for reading protected data before the fatal fault.\nI:N - The destination is the preallocated netvsc send buffer and the bug does not corrupt kernel control data or provide an arbitrary write. The demonstrated impact is not data modification.\nA:H - The invalid memcpy source faults on the transmit softirq path and the fix commit describes this as fatal. A kernel oops or panic from remotely triggerable network transmission is High availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:34:02.892Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/16514afeb7d3d121072ba9a0b640d6c1c5507db0"
        },
        {
          "url": "https://git.kernel.org/stable/c/a82d4251918f37d9c5aab7b365157669fb885ec3"
        },
        {
          "url": "https://git.kernel.org/stable/c/695c59cf7bf707e6ff8cea01916ee50e86616933"
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        {
          "url": "https://git.kernel.org/stable/c/09b8a7aa5a341bb345dc492aac139525efa13515"
        },
        {
          "url": "https://git.kernel.org/stable/c/918c0c988239aa5ab96b254e504d191af6191061"
        },
        {
          "url": "https://git.kernel.org/stable/c/0b38870d81ab3a04c1ab0598d9d3285f5d9d0584"
        },
        {
          "url": "https://git.kernel.org/stable/c/fe7221b4346418d27ec2daccfc09df6692b76f0b"
        },
        {
          "url": "https://git.kernel.org/stable/c/004e9ecfe6c5384f9e0b2f6f6389d42ec22789af"
        }
      ],
      "title": "hv_netvsc: use kmap_local_page in netvsc_copy_to_send_buf",
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53199",
    "datePublished": "2026-06-25T08:39:08.320Z",
    "dateReserved": "2026-06-09T07:44:35.391Z",
    "dateUpdated": "2026-08-05T12:34:02.892Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-53199",
      "date": "2026-08-06",
      "epss": "0.00501",
      "percentile": "0.40166"
    },
    "microsoft_vex": {
      "current_release_date": "2026-06-28T01:41:25.000Z",
      "cve": "CVE-2026-53199",
      "id": "msrc_CVE-2026-53199",
      "initial_release_date": "2026-06-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "hv_netvsc: use kmap_local_page in netvsc_copy_to_send_buf",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53199.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53199\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-25T09:16:37.440\",\"lastModified\":\"2026-07-06T12:32:29.893\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nhv_netvsc: use kmap_local_page in netvsc_copy_to_send_buf\\n\\nnetvsc_copy_to_send_buf() copies page buffer entries into the VMBus\\nsend buffer using phys_to_virt() on the entry PFN. Entries for the\\nRNDIS header and the skb linear data come from kmalloc\u0027d memory and\\nare always in the kernel direct map, but entries for skb fragments\\nreference page cache or user pages, which on 32-bit x86 with\\nCONFIG_HIGHMEM=y can live above the LOWMEM boundary. For such a page\\nphys_to_virt() returns an address outside the direct map and the\\nsubsequent memcpy() faults on the transmit softirq path, which is\\nfatal.\\n\\nMap the pages with kmap_local_page() instead, handling two properties\\nof the page buffer entries:\\n\\n - pb[i].pfn is a Hyper-V PFN at HV_HYP_PAGE_SIZE (4K) granularity,\\n   not a native PFN. Reconstruct the physical address first and derive\\n   the native page from it, so the mapping stays correct where\\n   PAGE_SIZE \u003e HV_HYP_PAGE_SIZE (e.g. arm64 with 64K pages).\\n\\n - Since commit 41a6328b2c55 (\\\"hv_netvsc: Preserve contiguous PFN\\n   grouping in the page buffer array\\\"), an entry describes a full\\n   physically contiguous fragment and pb[i].len can exceed PAGE_SIZE,\\n   while kmap_local_page() maps a single page. Copy page by page,\\n   splitting at native page boundaries.\\n\\nThe copy path only handles packets smaller than the send section size\\n(6144 bytes by default); larger packets take the cp_partial path where\\nonly the RNDIS header is copied. So entries here are bounded by the\\nsection size and a copy is split at most once on 4K-page systems. On\\n!CONFIG_HIGHMEM configs kmap_local_page() folds to page_address() and\\nno mapping work is added.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/hyperv/netvsc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e\",\"lessThan\":\"16514afeb7d3d121072ba9a0b640d6c1c5507db0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e\",\"lessThan\":\"a82d4251918f37d9c5aab7b365157669fb885ec3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e\",\"lessThan\":\"695c59cf7bf707e6ff8cea01916ee50e86616933\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e\",\"lessThan\":\"09b8a7aa5a341bb345dc492aac139525efa13515\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e\",\"lessThan\":\"918c0c988239aa5ab96b254e504d191af6191061\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e\",\"lessThan\":\"0b38870d81ab3a04c1ab0598d9d3285f5d9d0584\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e\",\"lessThan\":\"fe7221b4346418d27ec2daccfc09df6692b76f0b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c25aaf814a63f9d9c4e45416f13d70ef0aa0be2e\",\"lessThan\":\"004e9ecfe6c5384f9e0b2f6f6389d42ec22789af\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/hyperv/netvsc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.94\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.16\",\"versionEndExcluding\":\"5.10.259\",\"matchCriteriaId\":\"B0828E20-B004-4FD6-A232-E46191715B92\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.210\",\"matchCriteriaId\":\"5E938CDF-D1C4-43D0-98DC-9E11B6B55801\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.176\",\"matchCriteriaId\":\"C4446623-5F2B-4DD8-8666-9FAAC285A757\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.143\",\"matchCriteriaId\":\"9062F1CD-CAD6-4EA2-A73F-C06D4A887B8C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.94\",\"matchCriteriaId\":\"85421C0C-ABDE-4357-971C-67F9087DE1B9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.36\",\"matchCriteriaId\":\"389025D2-958D-41BD-BD96-70ED1033A9F3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:lin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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:32:10+00:00",
      "cve": "CVE-2026-53199",
      "id": "CVE-2026-53199",
      "initial_release_date": "2026-06-25T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: hv_netvsc: use kmap_local_page in netvsc_copy_to_send_buf",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53199.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-03T23:35:26Z",
      "cve": "CVE-2026-53199",
      "id": "CVE-2026-53199",
      "initial_release_date": "2026-06-26T02:10:20Z",
      "product_status:known_affected": "278",
      "product_status:known_not_affected": "17",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53199",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53199.json",
      "version": "4"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.