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

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-28 06:40
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)
Create a notification for this product.
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      "title": "hv_netvsc: use kmap_local_page in netvsc_copy_to_send_buf",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-26T01:31:38+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": "2026-06-27T01:53:26Z",
      "cve": "CVE-2026-53199",
      "id": "CVE-2026-53199",
      "initial_release_date": "2026-06-26T02:10:20Z",
      "product_status:known_affected": "276",
      "product_status:known_not_affected": "15",
      "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": "3"
    }
  }
}



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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.