CVE-2026-31714

Local service interruption via F2FS rename leak

Published May 1, 2026 · Updated May 1, 2026

Memory exhaustion in the F2FS rename path in Linux Kernel allows local users to interrupt service through repeated rename operations. f2fs_rename calls f2fs_setup_filename while preparing a whiteout but omits the matching f2fs_free_filename release, leaking each allocated filename object. A local user must be able to rename entries on an affected F2FS filesystem; sustained triggering consumes kernel memory until host availability is disrupted, without exposing or altering protected data.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory exhaustion in the F2FS rename path in Linux Kernel allows local users to interrupt service through repeated rename operations. f2fs_rename calls f2fs_setup_filename while preparing a whiteout but omits the matching f2fs_free_filename release, leaking each allocated filename object. A local user must be able to rename entries on an affected F2FS filesystem; sustained triggering consumes kernel memory until host availability is disrupted, without exposing or altering protected data.

The record

CVE
CVE-2026-31714
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1d1b89c9846e6a550eca3d2ce9323fb591e4f321
  2. Affected versionversion=40b2d55e045222dd6de2a54a299f682e0f954b03 <047c0aef6af37a2a35181aa085c616ad286386f1
  3. Affected versionversion=40b2d55e045222dd6de2a54a299f682e0f954b03 <369eb2016d8e2f01931b3bad1cb9cefa83f44003
  4. Affected versionversion=40b2d55e045222dd6de2a54a299f682e0f954b03 <3cf11e6f36c170050c12171dd6fd3142711478fc
  5. Affected versionversion=40b2d55e045222dd6de2a54a299f682e0f954b03 <c78206dcb912ab60b8ee3cbe8c48d749a9a12e1e
  6. Affected versionversion=64582cc5357cd984724cfb0835b4a34d9c279d31
  7. Affected versionversion=6.9
  8. Affected versionversion=7525dec4b34c80b3015c3f2ac143fd2bfc1febc3 <a76c1cad4e80a9802ef8048662255417e3ce5b79

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1d1b89c9846e6a550eca3d2ce9323fb591e4f321; version=40b2d55e045222dd6de2a54a299f682e0f954b03 <047c0aef6af37a2a35181aa085c616ad286386f1; version=40b2d55e045222dd6de2a54a299f682e0f954b03 <369eb2016d8e2f01931b3bad1cb9cefa83f44003; version=40b2d55e045222dd6de2a54a299f682e0f954b03 <3cf11e6f36c170050c12171dd6fd3142711478fc; version=40b2d55e045222dd6de2a54a299f682e0f954b03 <c78206dcb912ab60b8ee3cbe8c48d749a9a12e1e; version=64582cc5357cd984724cfb0835b4a34d9c279d31; version=6.9; version=7525dec4b34c80b3015c3f2ac143fd2bfc1febc3 <a76c1cad4e80a9802ef8048662255417e3ce5b79

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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