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CVE-2026-98091

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: btrfs: detach failed sprout device from transaction update list When creating the first metadata chunk for a sprout filesystem,…

Published Sep 25, 2026linuxCWE-416EPSS 0.12%

Overview

CVE-2026-98091 is a medium-severity vulnerability affecting linux linux_kernel. It was published on September 25, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

btrfs: detach failed sprout device from transaction update list

When creating the first metadata chunk for a sprout filesystem,

create_chunk() adds the new device to the transaction dev_update_list

through device->post_commit_list.

If the subsequent system chunk creation fails, btrfs_init_new_device()

aborts the transaction and releases the device while post_commit_list is

still linked. This triggers a warning in btrfs_free_device() and leaves

the transaction list referencing freed memory.

Detach the device while holding chunk_mutex before releasing it.

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
linuxlinux_kernel>= 5.2, < 5.10.271Affected

References

Refgit.kernel.org/stable/c/0ea6814bc0ff7cff443241bd34db9f0f828f3190Refgit.kernel.org/stable/c/2a57fb1d5ce8f316b81bbb60e6df245ebc816ffcRefgit.kernel.org/stable/c/63bfa52eb3289517aa82cb90e1189385873aae21Refgit.kernel.org/stable/c/7fe9dfbca43464baa8f050447a4837587b18adecRefgit.kernel.org/stable/c/86eff3052054e8f3b059b2d5845b6dcca021f20cRefgit.kernel.org/stable/c/8b001df2b37ca022f710f3254fbb0bcd6d9e1bedRefgit.kernel.org/stable/c/c93b3c43df561cd9f592cee20ae058b563f9e5b6Refgit.kernel.org/stable/c/e9e7e37afa85db770e6084360b21a21a8b3a583f

How CyberStrike helps

Frequently asked questions

What is CVE-2026-98091?

CVE-2026-98091 is a medium-severity vulnerability affecting linux linux_kernel. It was published on September 25, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-98091?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-98091?

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-98091?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-98091 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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