CVE-2026-64552
virtio-net: fix len check in receive_big()
Description
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.
INFO
Published Date :
July 27, 2026, 9:17 p.m.
Last Modified :
July 27, 2026, 9:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-64552
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel to the patched version.
- Ensure the bounds check matches advertised buffer size.
- Review virtio-net driver for similar issues.
- Test thoroughly after applying the patch.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64552.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64552 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64552
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64552 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64552 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 27, 2026
Action Type Old Value New Value Added Affected [{'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-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/virtio_net.c'], 'defaultStatus': 'affected'}] Added Description 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. Added Reference https://git.kernel.org/stable/c/38e94d63e29f4a5c6eae87ee2c02101aaa321502 Added Reference https://git.kernel.org/stable/c/9e5ad06ea826322ce8c58b4a68442a96f600c3c4 Added Reference https://git.kernel.org/stable/c/c7fc9adf4e006155f7f2aeda052fbcde25cdcc49 Added Reference https://git.kernel.org/stable/c/e6b8463b7d791f3886d7584259d6e9f06a69f12e Added Reference https://git.kernel.org/stable/c/f9451d0fd5ba635dcabb49bfe456a6db734a8986 Added Reference https://git.kernel.org/stable/c/fbeb65154583879d556ea94cb2f15888e9470f3d