CVE-2026-72380

Guest-kernel memory corruption via unchecked backend request ID

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds write in the Xen pvcalls frontend in Linux allows context-dependent attackers to corrupt guest-kernel memory via a crafted req_id. pvcalls_front_event_handler() uses the backend-supplied u32 req_id to index the fixed-size bedata->rsp[] array for a memcpy() and store without checking either bound. The required gate is control of the trusted Xen backend; the write corrupts frontend memory, with denial of service reported for affected operations.

CVSS severity8.8
High
EPSS probability0.29%
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 the Xen pvcalls frontend in Linux allows context-dependent attackers to corrupt guest-kernel memory via a crafted req_id. pvcalls_front_event_handler() uses the backend-supplied u32 req_id to index the fixed-size bedata->rsp[] array for a memcpy() and store without checking either bound. The required gate is control of the trusted Xen backend; the write corrupts frontend memory, with denial of service reported for affected operations.

The record

CVE
CVE-2026-72380
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=2195046bfd69e487d9a76dc47840f15c8412840c <d1297a9e2fd6ce08678b370d41bc980ca798f809
  2. Affected versionversion=2195046bfd69e487d9a76dc47840f15c8412840c <d33846c8dcc06b83b7acdeac1e8bfbb5c0c26cb2
  3. Affected versionversion=4.15

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2195046bfd69e487d9a76dc47840f15c8412840c <d1297a9e2fd6ce08678b370d41bc980ca798f809; version=2195046bfd69e487d9a76dc47840f15c8412840c <d33846c8dcc06b83b7acdeac1e8bfbb5c0c26cb2; version=4.15

Published CVSS scores

8.8cve.orgCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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