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Linux Kernel CVE-2026-80691

| EUVDEUVD-2026-67426 HIGH
2026-08-28 Linux GHSA-mp2w-vvvm-2m46
Information Disclosure Linux Red Hat Suse
7.5
CVSS 3.1 · Vendor: Linux
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Severity by source

Vendor (Linux) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
6.5 MEDIUM

iSCSI targets nearly always require initiator authentication; PR:L better reflects realistic access bar than NVD's PR:N, no confidentiality or integrity impact.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Red Hat
7.0 MEDIUM
qualitative

Primary rating from Vendor (Linux).

CVSS VectorVendor: Linux

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

5
Analysis Generated
Aug 29, 2026 - 08:02 vuln.today
CVSS changed
Aug 29, 2026 - 07:22 NVD
7.5 (HIGH)
Patch available
Aug 28, 2026 - 09:02 EUVD
CVE Published
Aug 28, 2026 - 06:52 cve.org
UNKNOWN (no severity yet)
CVE Published
Aug 28, 2026 - 06:52 cve.org
HIGH 7.5

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

scsi: target: iblock: Fix wrong PR ops NULL check for PREEMPT/RELEASE

In the iblock_execute_pr_out() function, PRO_PREEMPT, PRO_PREEMPT_AND_ABORT, and PRO_RELEASE all perform callback capability checks through ops->pr_clear. The error check allows unimplemented hooks to pass through the gate, resulting dereferencing a NULL function pointer.

Check whether the hooks that need to be called are supported.

AnalysisAI

Null pointer dereference in the Linux kernel's SCSI target iblock driver crashes the kernel when processing Persistent Reservation PREEMPT or RELEASE operations against storage backends with unimplemented PR hooks. Systems running the kernel as an iSCSI target are vulnerable - an attacker who can issue SCSI Persistent Reservation commands can trigger a kernel panic, causing a complete denial of service. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Persist
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target system runs the Linux kernel as an iSCSI target with the iblock backend driver active and configured. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided NVD CVSS vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, 7.5) treats this as unauthenticated remote exploitation, which overstates real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to a patched kernel version: Linux 6.6.151, 6.12.103, 6.18.44, 7.1.8, or 7.2 per the upstream stable commits referenced above. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all production Linux systems serving as iSCSI targets and determine current kernel versions. …

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 16.0 Affected

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CVE-2026-80691 vulnerability details – vuln.today
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