Out-of-bounds write in Linux kernel - CVE-2026-98545

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Main Vulnerability Database Vulnerabilities #VU156847

Out-of-bounds write in Linux kernel - CVE-2026-98545

Published: October 22, 2026


Vulnerability identifier: #VU156847
CSH Severity: Medium
CVSS v4: 5.2 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98545
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows an attacker with physical access to system to corrupt kernel memory and potentially cause a denial of service.

The vulnerability exists due to out-of-bounds reads and writes in ata_scsi_set_passthru_sense_fields() in the Linux kernel's libata-scsi component when processing a device's REQUEST SENSE reply after a failed ATA PASS-THROUGH command to an ATAPI device. An attacker with physical access to system can supply a crafted reply through a controlled ATAPI device, manipulating the additional length byte or descriptor layout to trigger accesses beyond the 96-byte sense buffer and potentially crash the kernel.


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

How to mitigate CVE-2026-98545

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

External References

Related Security Bulletins