VulnerabilityPublished 16 Sep 2026Updated 21 Oct 2026

CVE-2026-89837: Linux kernel · f2fs: fix dentry folio leak in find_in_level

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in cca7d3e30bf30333314e31bc70b9a739f1342167 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in cca7d3e30bf30333314e31bc70b9a739f1342167, b6c0e77d950bf80ab357e2b4b9667f4389ed417c, af9cc316d31371824de8d409260a2ab9759dd51c +2

Exploitation evidence

Disclosed: evidence found.
CVE published 16 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 7ad08a58bf67594057362e45cbddd3e27e53e557, < cca7d3e30bf30333314e31bc70b9a739f1342167	Fixed in cca7d3e30bf30333314e31bc70b9a739f1342167
LinuxLinux	Affected ≥ 7ad08a58bf67594057362e45cbddd3e27e53e557, < b6c0e77d950bf80ab357e2b4b9667f4389ed417c	Fixed in b6c0e77d950bf80ab357e2b4b9667f4389ed417c
LinuxLinux	Affected ≥ 7ad08a58bf67594057362e45cbddd3e27e53e557, < af9cc316d31371824de8d409260a2ab9759dd51c	Fixed in af9cc316d31371824de8d409260a2ab9759dd51c
LinuxLinux	Affected ≥ 7ad08a58bf67594057362e45cbddd3e27e53e557, < aefb4b0f465b6f95fe02b52d1822a3fb4a9ae922	Fixed in aefb4b0f465b6f95fe02b52d1822a3fb4a9ae922
LinuxLinux	Affected ≥ 7ad08a58bf67594057362e45cbddd3e27e53e557, < 93a3e6a4c9e726a13a935963e8dc43d181db1527	Fixed in 93a3e6a4c9e726a13a935963e8dc43d181db1527
LinuxLinux	Affected =5.11	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix dentry folio leak in find_in_level find_in_level() gets a dentry folio with f2fs_find_data_folio() before calling find_in_block(). If find_in_block() returns an error, the function stores the error in res_folio and breaks out of the loop without dropping the dentry folio. This leaks the folio reference on the find_in_block() error path. Drop the dentry folio before returning the error to the caller.

References

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