hv_netvsc: use kmap_local_page in netvsc_copy_to_send_buf
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
CVE-2026-53199
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-53199
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"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"
}
],
"programFiles": [
"drivers/net/hyperv/netvsc.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.94",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.36",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.13",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/hyperv/netvsc.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-53199
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40776 · Revision 1
- Added to Heist Feed
- Publisher date