VulnerabilityPublished 16 Sep 2026Updated 30 Oct 2026

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

Source GCVE Database

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Authoritative record:CVE-2026-89834· High

Not known to be exploited · fixed in d358d2fc6be11eefde5eb1286f1c43a6d0330db6 : patch Linux kernel soon.

Data as of 30 Oct 2026, 19:33 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in d358d2fc6be11eefde5eb1286f1c43a6d0330db6, b9776094aa7118e8e5dfdcd791ffc8330c5ca408, b8ae1228c153622afa71a179c9d4dc268117e0f0 +3

Exploitation evidence

Disclosed: evidence found.
CVE published 16 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-92fw-gww6-96g8

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d0b9e42ab6155dc05fc83f00af9f45d4dd02264d, < d358d2fc6be11eefde5eb1286f1c43a6d0330db6	Fixed in d358d2fc6be11eefde5eb1286f1c43a6d0330db6
LinuxLinux	Affected ≥ d0b9e42ab6155dc05fc83f00af9f45d4dd02264d, < b9776094aa7118e8e5dfdcd791ffc8330c5ca408	Fixed in b9776094aa7118e8e5dfdcd791ffc8330c5ca408
LinuxLinux	Affected ≥ d0b9e42ab6155dc05fc83f00af9f45d4dd02264d, < b8ae1228c153622afa71a179c9d4dc268117e0f0	Fixed in b8ae1228c153622afa71a179c9d4dc268117e0f0
LinuxLinux	Affected ≥ d0b9e42ab6155dc05fc83f00af9f45d4dd02264d, < 8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1	Fixed in 8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1
LinuxLinux	Affected ≥ d0b9e42ab6155dc05fc83f00af9f45d4dd02264d, < 7ffac0deea2d84cf79051f16fed8e215c4bcf0e6	Fixed in 7ffac0deea2d84cf79051f16fed8e215c4bcf0e6
LinuxLinux	Affected ≥ d0b9e42ab6155dc05fc83f00af9f45d4dd02264d, < 3b85edf3391f3e1f624f409a7d2d239885f567b7	Fixed in 3b85edf3391f3e1f624f409a7d2d239885f567b7

AI-suggested

A fix has been implemented in the Linux kernel to expand the curseg evacuation loop to cover all curseg types. Users should apply the official kernel updates that include this fix once available. No alternative mitigations are indicated.

Description

A vulnerability in the Linux kernel's f2fs filesystem was fixed to ensure all current segment (curseg) types are migrated during the free_segment_range operation. The issue involved the evacuation loop missing certain non-persistent in-memory curseg types, which could lead to out-of-bounds I/O on truncated storage ranges during filesystem shrink operations.

References

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