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CVE-2026-98080

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: btrfs: do not force reloc root creation during qgroup_account_snapshot() [BUG] When running btrfs/252 with quota enabled throug…

Published Sep 25, 2026linuxCWE-672EPSS 0.13%

Overview

CVE-2026-98080 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: do not force reloc root creation during qgroup_account_snapshot()

[BUG]

When running btrfs/252 with quota enabled through MKFS_OPTIONS="-O quota",

it has a high chance to trigger the following kernel warning and flips

the fs RO:

BTRFS info (device dm-2): relocating block group 30408704 flags metadata|dup

------------[ cut here ]------------

WARNING: fs/btrfs/extent-tree.c:879 at lookup_inline_extent_backref+0x74b/0x960 [btrfs], CPU#4: btrfs/2173

CPU: 4 UID: 0 PID: 2173 Comm: btrfs Not tainted 7.2.0-rc6-custom+ #457 PREEMPT(full) 3adc6528fb66f7a55fe1095385818e742f200aab

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022

RIP: 0010:lookup_inline_extent_backref+0x74b/0x960 [btrfs]

Call Trace:

<TASK>

insert_inline_extent_backref+0x7c/0x160 [btrfs 32f09462c54d9c922fca74a3e4866f4aa7737b72]

__btrfs_inc_extent_ref+0xa9/0x270 [btrfs 32f09462c54d9c922fca74a3e4866f4aa7737b

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>= 4.14.45, < 4.15Affected

References

Refgit.kernel.org/stable/c/203cbfb4fba590bd9b08bd36fa6d05b5d28923bfRefgit.kernel.org/stable/c/21bd77c132f18dc21c6fcdf417310d1adcf7448bRefgit.kernel.org/stable/c/7caaae233a55e167063f4cfa3385b1a04c8bbecbRefgit.kernel.org/stable/c/7ce02d52548b672795511c2cac8da6ec79ac8877Refgit.kernel.org/stable/c/b5d5ab5a715001dd937c920ef8c5688fd4999ba1Refgit.kernel.org/stable/c/c4c78768d1a8ceb713693cc5524acbe984c31f3cRefgit.kernel.org/stable/c/cacf35832292997018837e484283f95a9301ebf5Refgit.kernel.org/stable/c/d0284d974be46a0a06068f930c84039d540ae8ed

How CyberStrike helps

Frequently asked questions

What is CVE-2026-98080?

CVE-2026-98080 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-2026-98080?

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-2026-98080?

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-2026-98080?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-98080 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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