CVE-2026-74703

Host kernel panic via malformed protection length

Published Aug 22, 2026 · Updated Aug 25, 2026

Denial of service in the Linux vhost-scsi component allows guest OS users to panic the host kernel through crafted T10 PI requests. When T10 PI is negotiated, vhost-scsi subtracts an unchecked guest-controlled protection length from the payload and can pass a zero-entry data scatterlist to sg_alloc_table_chained. A malicious KVM guest must have the T10 PI feature negotiated; the resulting BUG interrupts the hypervisor and its co-resident virtual machines.

CVSS severity7.1
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

Denial of service in the Linux vhost-scsi component allows guest OS users to panic the host kernel through crafted T10 PI requests. When T10 PI is negotiated, vhost-scsi subtracts an unchecked guest-controlled protection length from the payload and can pass a zero-entry data scatterlist to sg_alloc_table_chained. A malicious KVM guest must have the T10 PI feature negotiated; the resulting BUG interrupts the hypervisor and its co-resident virtual machines.

The record

CVE
CVE-2026-74703
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-191, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=6.15
  2. Affected versionversion=bca939d5bcd00d6faea99c47eafd60bed573ef03 <2417a498cf3fe64d06faf87e236eda98dd4f04e0
  3. Affected versionversion=bca939d5bcd00d6faea99c47eafd60bed573ef03 <d876c493fc4b811941bfeb4c80beb2dfc4bf025e
  4. Affected versionversion=bca939d5bcd00d6faea99c47eafd60bed573ef03 <f8fe3f8d342da750dd10361bf66009fd3072926b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.15; version=bca939d5bcd00d6faea99c47eafd60bed573ef03 <2417a498cf3fe64d06faf87e236eda98dd4f04e0; version=bca939d5bcd00d6faea99c47eafd60bed573ef03 <d876c493fc4b811941bfeb4c80beb2dfc4bf025e; version=bca939d5bcd00d6faea99c47eafd60bed573ef03 <f8fe3f8d342da750dd10361bf66009fd3072926b

Published CVSS scores

7.1LinuxCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
6.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1499Endpoint Denial of Service

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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