virtio-net: fix len check in receive_big()
In the Linux kernel, the following vulnerability has been resolved: virtio-net: fix len check in receive_big() receive_big() bounds the device-announced length by (big_packets_num_skbfrags + 1) * PAGE_SIZE. That is still too loose: add_recvbuf_big() sets sg[1] to start at offset sizeof(struct padded_vnet_hdr) into the first page, so the chain actually carries hdr_len + (PAGE_SIZE - sizeof(padded_vnet_hdr)) + big_packets_num_skbfrags * PAGE_SIZE bytes -- 20 bytes less than the check allows for the common hdr_len == 12 case. A malicious virtio backend can announce a len in that gap. page_to_skb() then walks one frag past the page chain, storing a NULL page->private into skb_shinfo()->frags[MAX_SKB_FRAGS], which is both an out-of-bounds write past the static frag array and a NULL frag handed up the rx path. Bound len by the size add_recvbuf_big() actually advertised.
CVE-2026-64552
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-2026-64552
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": "82f9028e83944a9eee5229cbc6fee9be1de8a62d",
"lessThan": "f9451d0fd5ba635dcabb49bfe456a6db734a8986",
"versionType": "git"
},
{
"status": "affected",
"version": "946dec89c41726b94d31147ec528b96af0be1b5a",
"lessThan": "38e94d63e29f4a5c6eae87ee2c02101aaa321502",
"versionType": "git"
},
{
"status": "affected",
"version": "82fe78065450d2d07f36a22e2b6b44955cf5ca5b",
"lessThan": "fbeb65154583879d556ea94cb2f15888e9470f3d",
"versionType": "git"
},
{
"status": "affected",
"version": "0c716703965ffc5ef4311b65cb5d84a703784717",
"lessThan": "c7fc9adf4e006155f7f2aeda052fbcde25cdcc49",
"versionType": "git"
},
{
"status": "affected",
"version": "0c716703965ffc5ef4311b65cb5d84a703784717",
"lessThan": "e6b8463b7d791f3886d7584259d6e9f06a69f12e",
"versionType": "git"
},
{
"status": "affected",
"version": "0c716703965ffc5ef4311b65cb5d84a703784717",
"lessThan": "9e5ad06ea826322ce8c58b4a68442a96f600c3c4",
"versionType": "git"
},
{
"status": "affected",
"version": "3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2",
"versionType": "git"
},
{
"status": "affected",
"version": "6.1.159",
"lessThan": "6.1.178",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.117",
"lessThan": "6.6.145",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.58",
"lessThan": "6.12.97",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.17.8",
"lessThan": "6.18",
"versionType": "semver"
}
],
"programFiles": [
"drivers/net/virtio_net.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/virtio_net.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64552
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41081 · Revision 1
- Added to Heist Feed
- Publisher date