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Linux Kernel CVE-2026-80645

| EUVDEUVD-2026-67521 HIGH
2026-08-28 Linux GHSA-fmq3-pjfg-pm48
Information Disclosure Linux Red Hat Suse
8.1
CVSS 3.1 · Vendor: Linux
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Severity by source

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

Adjacent vector required; RapidIO has no software auth (PR:N); confidentiality impact absent per description; invalid dereference causes integrity corruption and availability loss.

3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
4.0 AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/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
5.5 MEDIUM
qualitative

Primary rating from Vendor (Linux).

CVSS VectorVendor: Linux

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

Lifecycle Timeline

5
Analysis Generated
Aug 29, 2026 - 07:43 vuln.today
CVSS changed
Aug 29, 2026 - 07:22 NVD
8.1 (HIGH)
Patch available
Aug 28, 2026 - 09:02 EUVD
CVE Published
Aug 28, 2026 - 06:48 cve.org
HIGH 8.1
CVE Published
Aug 28, 2026 - 06:48 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

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

rapidio/tsi721: prevent a bad dereference in tsi721_db_dpc()

With a list_for_each() loop, if we don't find the item we are looking for in the list, then the loop exits with the iterator, which is "dbell" in this loop, pointing to invalid memory.

This code uses the "found" variable to determine if we have found the doorbell we are looking for or not. However, the problem that the "found" variable needs to be set to false at the start of each iteration, otherwise after the first correct doorbell, then everything is marked as found.

Reset the "found" to false at the start of the iteration and move the variable inside the loop.

AnalysisAI

Invalid pointer dereference in the Linux kernel's RapidIO TSI721 driver allows an unauthenticated attacker on an adjacent RapidIO network to crash the kernel or corrupt memory by sending a crafted doorbell message. The root cause is a logic error in tsi721_db_dpc(): the 'found' flag is not reset at the start of each list_for_each() iteration, causing every doorbell after the first match to be treated as found, and causing list-end traversal with an invalid iterator pointer when no match exists. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Execution
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Vulnerability AssessmentAI

Exploitation Exploitation requires: (1) the target system must have a Tundra/IDT TSI721 PCIe-to-RapidIO bridge chip physically installed and the tsi721 kernel module loaded; (2) the attacker must be physically adjacent on the same RapidIO fabric - this is a chip-to-chip/board-to-board interconnect, not a general IP network, so remote Internet exploitation is not possible; (3) the attacker must be able to send RapidIO doorbell messages to the vulnerable host, which requires either control of an adjacent RapidIO endpoint or direct hardware access to the bus. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The NVD-assigned CVSS 8.1 (AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H) is mechanically correct but overstates practical risk significantly. … 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 Update the Linux kernel to a patched stable release: 5.10.261 or later for the 5.10.x LTS branch, 5.15.212 or later for 5.15.x LTS, 6.1.178 or later for 6.1.x LTS, 6.6.145 or later for 6.6.x LTS, 6.12.97 or later for 6.12.x LTS, 6.18.40 or later for 6.18.x, 7.1.5 or later for 7.1.x, or 7.2 for the mainline branch. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Immediately audit infrastructure for systems running Linux kernels with the RapidIO TSI721 driver enabled, particularly HPC clusters and specialized computing platforms. …

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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 Not-Affected

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CVE-2026-80645 vulnerability details – vuln.today
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