NVD / CVE Program· CNA Linux

CVE-2026-98090: btrfs: restore active device pointers after failed sprout

Noroxi assessment

Priority: Monitor (action score 22/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 0a0ee38ad6324ac1603079bb785f784191576bd5, 2ee5c4bc11007c51f63f0c1be5d3f07f2b404ff7, 46863a9f93186e620c70584f91c8d5d95da83eff; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0a0ee38ad6324ac1603079bb785f784191576bd5, 2ee5c4bc11007c51f63f0c1be5d3f07f2b404ff7, 46863a9f93186e620c70584f91c8d5d95da83eff; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: btrfs: restore active device pointers after failed sprout btrfs_init_new_device() switches latest_dev and possibly s_bdev from the seed device to the new sprout device before creating the first writable chunks. If chunk creation or the subsequent sprout setup fails, the error path releases the new device without switching those pointers back. btrfs_show_devname() can then dereference the freed latest_dev and crash. Restore the active device pointers to the latest seed device before removing and releasing the failed sprout device.

MediumCVSS 5.5 · v3.1—No exploit Fix available

EUVD-2026-86920

Published: Sep 25, 2026
Updated: Oct 23, 2026
EPSS: 0.1% · 2th percentile
CWE: CWE-416

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 22 / 40 · 5.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernel5.13 and later · before 5.15.222
linux linux kernel5.16 and later · before 6.1.189
linux linux kernel6.2 and later · before 6.6.158
linux linux kernel6.7 and later · before 6.12.111
linux linux kernel6.13 and later · before 6.18.53
linux linux kernel6.19 and later · before 7.2.7
linux linux kernel7.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

Linux Linux
- 5.16affected
- a6e7e218a4d6488d56727a7d9aee1b7e78c0c485 and later · before 46863a9f93186e620c70584f91c8d5d95da83effaffected · git
- b7cb29e666fe79dda5dbe5f57fb7c92413bf161c and later · before 49179f13c04735c55fd0f43b03696c015b067137affected · git
- b7cb29e666fe79dda5dbe5f57fb7c92413bf161c and later · before 0a0ee38ad6324ac1603079bb785f784191576bd5affected · git
- b7cb29e666fe79dda5dbe5f57fb7c92413bf161c and later · before 2ee5c4bc11007c51f63f0c1be5d3f07f2b404ff7affected · git
- b7cb29e666fe79dda5dbe5f57fb7c92413bf161c and later · before e127ac29a52134d0f4cba39d38e4b375deb3d1aaaffected · git
- b7cb29e666fe79dda5dbe5f57fb7c92413bf161c and later · before b79b4b29003690acfade8241998fc0104ef9c84caffected · git
- b7cb29e666fe79dda5dbe5f57fb7c92413bf161c and later · before e0b54613aabeb8e9da597f23b90c6a03d0981986affected · git
- 5.15.11 and later · before 5.15.222affected · semver
- before 5.16not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.190-1	6.1.190-1
Debian:12	linux-6.12	before 6.12.111-1~deb12u1	6.12.111-1~deb12u1
Debian:13	linux	before 6.12.111-1	6.12.111-1
Debian:14	linux	before 7.2.7-1	7.2.7-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
90Now
CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2026-98082Sep 25, 2026 · btrfs: fix the possible bioc_list memory leak during error
22Monitor
← EarlierCVE-2026-98083Sep 25, 2026 · btrfs: fix transaction use-after-free in raid stripe insertion
28Monitor
Later →CVE-2026-98091Sep 25, 2026 · btrfs: detach failed sprout device from transaction update list
22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Linux Linux	0a0ee38ad6324ac1603079bb785f784191576bd5	Vendor (CNA)
Linux Linux	2ee5c4bc11007c51f63f0c1be5d3f07f2b404ff7	Vendor (CNA)
Linux Linux	46863a9f93186e620c70584f91c8d5d95da83eff	Vendor (CNA)
Linux Linux	49179f13c04735c55fd0f43b03696c015b067137	Vendor (CNA)
Linux Linux	5.15.222	Vendor (CNA)
Linux Linux	b79b4b29003690acfade8241998fc0104ef9c84c	Vendor (CNA)
Linux Linux	e0b54613aabeb8e9da597f23b90c6a03d0981986	Vendor (CNA)
Linux Linux	e127ac29a52134d0f4cba39d38e4b375deb3d1aa	Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0	6.6.158.1-1 · Release Notes	Microsoft (MSRC)
debian:linux	6.1.190-1 · Debian:12	Package registry (OSV)
debian:linux	6.12.111-1 · Debian:13	Package registry (OSV)
debian:linux-6.12	6.12.111-1~deb12u1 · Debian:12	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-26-1184 · Sep 28, 2026(Linux Kernel Güvenlik Bildirimi)

All national notices →

Technical details

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

CVSS— → 5.5Oct 23, 2026, 7:07 PM UTC
Severity— → mediumOct 23, 2026, 7:07 PM UTC
Fix✗ → ✓Sep 28, 2026, 9:54 PM UTC

For records you follow, these changes also arrive as notifications. →

References

git.kernel.org/stable/c/0a0ee38ad6324ac1603079bb785f784191576bd5

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records