CVE-2026-74702

Guest-to-host kernel crash via late T10-PI enablement

Published Aug 22, 2026 · Updated Aug 25, 2026

NULL pointer dereference in Linux vhost-scsi allows guest OS users to crash the host kernel through crafted protection I/O. After endpoint setup without T10-PI, vhost_scsi_set_features() accepts the bit, but command pools retain a NULL prot_sgl and vhost_scsi_mapal() passes it to sg_alloc_table_chained(). Access from a guest using the vhost-scsi backend and a 129-page protection payload triggers a host oops or panic that interrupts the hypervisor and co-resident guests.

CVSS severity8.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux vhost-scsi allows guest OS users to crash the host kernel through crafted protection I/O. After endpoint setup without T10-PI, vhost_scsi_set_features() accepts the bit, but command pools retain a NULL prot_sgl and vhost_scsi_mapal() passes it to sg_alloc_table_chained(). Access from a guest using the vhost-scsi backend and a 129-page protection payload triggers a host oops or panic that interrupts the hypervisor and co-resident guests.

The record

CVE
CVE-2026-74702
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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=bf2d650391be508dd8b5e188b65ed32300cf3489 <42bc45df5905e2b7dccb72adaf7730f66cfbe03f
  3. Affected versionversion=bf2d650391be508dd8b5e188b65ed32300cf3489 <9a3eb77a612f9d158e4d27df43677a014e9cfa55
  4. Affected versionversion=bf2d650391be508dd8b5e188b65ed32300cf3489 <a06e4611d45518896fbff4f45d9581578b107e91

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.15; version=bf2d650391be508dd8b5e188b65ed32300cf3489 <42bc45df5905e2b7dccb72adaf7730f66cfbe03f; version=bf2d650391be508dd8b5e188b65ed32300cf3489 <9a3eb77a612f9d158e4d27df43677a014e9cfa55; version=bf2d650391be508dd8b5e188b65ed32300cf3489 <a06e4611d45518896fbff4f45d9581578b107e91

Published CVSS scores

8.8Linux Kernel CVE TeamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
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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