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NVD / CVE Program· CNA Linux

CVE-2026-89834: f2fs: fix to migrate all curseg types during free_segment_range

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 3b85edf3391f3e1f624f409a7d2d239885f567b7, 7ffac0deea2d84cf79051f16fed8e215c4bcf0e6, 8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 3b85edf3391f3e1f624f409a7d2d239885f567b7, 7ffac0deea2d84cf79051f16fed8e215c4bcf0e6, 8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1 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 migrate all curseg types during free_segment_range In free_segment_range(), the curseg evacuation loop only iterates up to NR_CURSEG_PERSIST_TYPE (0..5), missing non-persistent in-memory curseg types such as CURSEG_COLD_DATA_PINNED and CURSEG_ALL_DATA_ATGC. Even though these in-memory curseg types are not saved in the on-disk checkpoint header, they still occupy active physical segments at runtime. If an active in-memory curseg happens to be allocated within the segment range being truncated during filesystem shrink, failing to evacuate it will cause subsequent writes to the curseg attempting out-of-bounds I/O on the truncated storage range. Fix this by expanding the curseg evacuation loop upper bound to NR_CURSEG_TYPE to ensure all active curseg types are safely migrated out of the target range.

—No exploit Fix available
Published
Sep 16, 2026
Updated
Oct 30, 2026
EPSS
0.2% · 11th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Get told when this record changes

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  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

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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

    • 5.10affected
    • d0b9e42ab6155dc05fc83f00af9f45d4dd02264d and later · before 7ffac0deea2d84cf79051f16fed8e215c4bcf0e6affected · git
    • d0b9e42ab6155dc05fc83f00af9f45d4dd02264d and later · before d358d2fc6be11eefde5eb1286f1c43a6d0330db6affected · git
    • d0b9e42ab6155dc05fc83f00af9f45d4dd02264d and later · before 3b85edf3391f3e1f624f409a7d2d239885f567b7affected · git
    • d0b9e42ab6155dc05fc83f00af9f45d4dd02264d and later · before b8ae1228c153622afa71a179c9d4dc268117e0f0affected · git
    • d0b9e42ab6155dc05fc83f00af9f45d4dd02264d and later · before b9776094aa7118e8e5dfdcd791ffc8330c5ca408affected · git
    • d0b9e42ab6155dc05fc83f00af9f45d4dd02264d and later · before 8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1affected · git
    • before 5.10not affected · semver
    • 6.1.191 and later · up to and including 6.1.*not affected · semver
    • 6.6.160 and later · up to and including 6.6.*not 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 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
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-2026-89832Sep 16, 2026 · f2fs: fix to clear dirty flag on folio in error path
    31Monitor
  • ← EarlierCVE-2026-89833Sep 16, 2026 · f2fs: fix to avoid potential deadloop in f2fs_fsync_node_pages()
    0Monitor
  • Later →CVE-2026-89835Sep 16, 2026 · f2fs: avoid NULL checkpoint thread access in sysfs
    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 Linux3b85edf3391f3e1f624f409a7d2d239885f567b7Vendor (CNA)
Linux Linux7ffac0deea2d84cf79051f16fed8e215c4bcf0e6Vendor (CNA)
Linux Linux8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1Vendor (CNA)
Linux Linuxb8ae1228c153622afa71a179c9d4dc268117e0f0Vendor (CNA)
Linux Linuxb9776094aa7118e8e5dfdcd791ffc8330c5ca408Vendor (CNA)
Linux Linuxd358d2fc6be11eefde5eb1286f1c43a6d0330db6Vendor (CNA)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~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

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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