CVE-2025-68315Network attack vector

Kernel memory corruption via unchecked F2FS node identifier

Published Dec 16, 2025 · Updated Dec 16, 2025

Memory corruption in Linux F2FS allows remote attackers to trigger out-of-bounds kernel access through file creation on a writable NFS export. f2fs_alloc_nid() consumes an out-of-range node identifier from free_nid_list and uses it to index the free-NID bitmap and pointer arrays before committing invalid node and NAT metadata. The network path requires corrupted on-disk footer metadata and a writable NFS export accepting unauthenticated CREATE requests; exploitation can crash or hang the kernel, corrupt the filesystem, or compromise kernel execution.

CVSS severity9.8
Critical
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Linux F2FS allows remote attackers to trigger out-of-bounds kernel access through file creation on a writable NFS export. f2fs_alloc_nid() consumes an out-of-range node identifier from free_nid_list and uses it to index the free-NID bitmap and pointer arrays before committing invalid node and NAT metadata. The network path requires corrupted on-disk footer metadata and a writable NFS export accepting unauthenticated CREATE requests; exploitation can crash or hang the kernel, corrupt the filesystem, or compromise kernel execution.

The record

CVE
CVE-2025-68315
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 2025Record 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6b9525596a83cd5b7bbc2c7bd5f9ad9cf5ad60fa
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8fc6056dcf79937c46c97fa4996cda65956437a9
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <adbcb34f03abb89e681a5907c4c3ce4bf224991d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6b9525596a83cd5b7bbc2c7bd5f9ad9cf5ad60fa; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8fc6056dcf79937c46c97fa4996cda65956437a9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <adbcb34f03abb89e681a5907c4c3ce4bf224991d

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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