Linux Kernel up to 7.1.4 virtio-net receive_big memory corruption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.5$5k-$25k0.70

Summaryinfo

A vulnerability classified as very critical was found in Linux Kernel up to 6.1.177/6.6.144/6.12.96/6.18.39/7.1.4. Affected by this vulnerability is the function receive_big of the component virtio-net. Executing a manipulation can lead to memory corruption. The identification of this vulnerability is CVE-2026-64552. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.177/6.6.144/6.12.96/6.18.39/7.1.4. It has been declared as very critical. This vulnerability affects the function receive_big of the component virtio-net. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at git.kernel.org. This vulnerability was named CVE-2026-64552 since 07/19/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 07/27/2026).

Upgrading to version 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5 or 7.2-rc1 eliminates this vulnerability. Applying the patch f9451d0fd5ba635dcabb49bfe456a6db734a8986/38e94d63e29f4a5c6eae87ee2c02101aaa321502/fbeb65154583879d556ea94cb2f15888e9470f3d/c7fc9adf4e006155f7f2aeda052fbcde25cdcc49/e6b8463b7d791f3886d7584259d6e9f06a69f12e/9e5ad06ea826322ce8c58b4a68442a96f600c3c4 is able to eliminate this problem.

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Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.178/6.6.145/6.12.97/6.18.40/7.1.5/7.2-rc1
Patch: f9451d0fd5ba635dcabb49bfe456a6db734a8986/38e94d63e29f4a5c6eae87ee2c02101aaa321502/fbeb65154583879d556ea94cb2f15888e9470f3d/c7fc9adf4e006155f7f2aeda052fbcde25cdcc49/e6b8463b7d791f3886d7584259d6e9f06a69f12e/9e5ad06ea826322ce8c58b4a68442a96f600c3c4

Timelineinfo

07/19/2026 CVE reserved
07/27/2026 +8 days Advisory disclosed
07/27/2026 +0 days VulDB entry created
07/27/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64552 (🔒)
GCVE (CVE): GCVE-0-2026-64552
GCVE (VulDB): GCVE-100-383614

Entryinfo

Created: 07/27/2026 23:34
Changes: 07/27/2026 23:34 (59)
Complete: 🔍
Cache ID: 216::103

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