CVE-2026-64552

Backend-to-guest memory corruption via oversized receive length

Published Jul 27, 2026 · Updated Jul 27, 2026

Out-of-bounds write in virtio-net in Linux Kernel allows attackers to corrupt guest kernel memory via a crafted RX length. receive_big() accepts a device-announced length up to 20 bytes beyond the scatter-gather capacity advertised by add_recvbuf_big(), so page_to_skb() walks past the page chain and writes a NULL fragment beyond skb_shinfo()->frags[]. The attacker must control a virtio backend; processing the RX descriptor corrupts adjacent kernel memory and produces a kernel oops without guest-side credentials or interaction.

CVSS severity8.4
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in virtio-net in Linux Kernel allows attackers to corrupt guest kernel memory via a crafted RX length. receive_big() accepts a device-announced length up to 20 bytes beyond the scatter-gather capacity advertised by add_recvbuf_big(), so page_to_skb() walks past the page chain and writes a NULL fragment beyond skb_shinfo()->frags[]. The attacker must control a virtio backend; processing the RX descriptor corrupts adjacent kernel memory and produces a kernel oops without guest-side credentials or interaction.

The record

CVE
CVE-2026-64552
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0c716703965ffc5ef4311b65cb5d84a703784717 <9e5ad06ea826322ce8c58b4a68442a96f600c3c4
  2. Affected versionversion=0c716703965ffc5ef4311b65cb5d84a703784717 <c7fc9adf4e006155f7f2aeda052fbcde25cdcc49
  3. Affected versionversion=0c716703965ffc5ef4311b65cb5d84a703784717 <e6b8463b7d791f3886d7584259d6e9f06a69f12e
  4. Affected versionversion=3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2
  5. Affected versionversion=6.1.159 <6.1.178
  6. Affected versionversion=6.12.58 <6.12.97
  7. Affected versionversion=6.17.8 <6.18
  8. Affected versionversion=6.18
  9. Affected versionversion=6.6.117 <6.6.145
  10. Affected versionversion=82f9028e83944a9eee5229cbc6fee9be1de8a62d <f9451d0fd5ba635dcabb49bfe456a6db734a8986
  11. Affected versionversion=82fe78065450d2d07f36a22e2b6b44955cf5ca5b <fbeb65154583879d556ea94cb2f15888e9470f3d
  12. Affected versionversion=946dec89c41726b94d31147ec528b96af0be1b5a <38e94d63e29f4a5c6eae87ee2c02101aaa321502

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0c716703965ffc5ef4311b65cb5d84a703784717 <9e5ad06ea826322ce8c58b4a68442a96f600c3c4; version=0c716703965ffc5ef4311b65cb5d84a703784717 <c7fc9adf4e006155f7f2aeda052fbcde25cdcc49; version=0c716703965ffc5ef4311b65cb5d84a703784717 <e6b8463b7d791f3886d7584259d6e9f06a69f12e; version=3e9d89f2ecd3636bd4cbdfd0b2dfdaf58f9882e2; version=6.1.159 <6.1.178; version=6.12.58 <6.12.97; version=6.17.8 <6.18; version=6.18; version=6.6.117 <6.6.145; version=82f9028e83944a9eee5229cbc6fee9be1de8a62d <f9451d0fd5ba635dcabb49bfe456a6db734a8986; version=82fe78065450d2d07f36a22e2b6b44955cf5ca5b <fbeb65154583879d556ea94cb2f15888e9470f3d; version=946dec89c41726b94d31147ec528b96af0be1b5a <38e94d63e29f4a5c6eae87ee2c02101aaa321502

Published CVSS scores

8.4kernel.orgCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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