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NVD / CVE Program· CNA Linux

CVE-2026-89832: f2fs: fix to clear dirty flag on folio in error path

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.16% (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 21b7f66716b4fd0dffac4fcd06602b888f3c4531, 34732e3a8713f3b7acd1a0ea37e3a6bee4c78550, 3923ec2b98c96dda4a8bfab81d22553dbf0dd6c2.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 21b7f66716b4fd0dffac4fcd06602b888f3c4531, 34732e3a8713f3b7acd1a0ea37e3a6bee4c78550, 3923ec2b98c96dda4a8bfab81d22553dbf0dd6c2 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: f2fs: fix to clear dirty flag on folio in error path If node block is corrupted due to chksum mismatch or inconsistent footer info, it needs to drop clear flag of node folio, in order to persist inconsistent node data to storage.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Sep 16, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 6th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-89832

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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.

—

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

    • 8d7ebdd109b4654ec5e0e9c3c6f08b06d6558f10, b039536485970829918aa237a08417bd0ed5437c, 5.2affected
    • b42b179bda9ff11075a6fc2bac4d9e400513679a and later · before 9e0d9a317ce2cae3768626599d857bb3f0fd96fcaffected · git
    • b42b179bda9ff11075a6fc2bac4d9e400513679a and later · before 21b7f66716b4fd0dffac4fcd06602b888f3c4531affected · git
    • b42b179bda9ff11075a6fc2bac4d9e400513679a and later · before 34732e3a8713f3b7acd1a0ea37e3a6bee4c78550affected · git
    • b42b179bda9ff11075a6fc2bac4d9e400513679a and later · before ab35ae07f2b5b4e118ea47b88577fc7d0e797b17affected · git
    • b42b179bda9ff11075a6fc2bac4d9e400513679a and later · before 3923ec2b98c96dda4a8bfab81d22553dbf0dd6c2affected · git
    • b42b179bda9ff11075a6fc2bac4d9e400513679a and later · before 5b86eab84ac8e9289b5afc52ef88ab18ba5bacabaffected · git
    • 4.19.51 and later · before 4.20affected · semver
    • 5.1.10 and later · before 5.2affected · semver
    • before 5.2not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-89830Sep 16, 2026 · f2fs: fix valid block count leak on data block allocation failure
    0Monitor
  • ← EarlierCVE-2026-89831Sep 16, 2026 · f2fs: protect critical_task_priority updates with s_umount
    0Monitor
  • Later →CVE-2026-89833Sep 16, 2026 · f2fs: fix to avoid potential deadloop in f2fs_fsync_node_pages()
    0Monitor

Remediation

Which version to upgrade to

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

Product / packageFixed versionSource
Linux Linux21b7f66716b4fd0dffac4fcd06602b888f3c4531Vendor (CNA)
Linux Linux34732e3a8713f3b7acd1a0ea37e3a6bee4c78550Vendor (CNA)
Linux Linux3923ec2b98c96dda4a8bfab81d22553dbf0dd6c2Vendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux5.2Vendor (CNA)
Linux Linux5b86eab84ac8e9289b5afc52ef88ab18ba5bacabVendor (CNA)
Linux Linux9e0d9a317ce2cae3768626599d857bb3f0fd96fcVendor (CNA)
Linux Linuxab35ae07f2b5b4e118ea47b88577fc7d0e797b17Vendor (CNA)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux7.2.6-1 · Debian:14Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · Debian:12Package 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.

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
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

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

  1. Fix✗ → ✓

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

References

Show all references (5 more)

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

All records