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Linux Kernel CVE-2025-68315

CRITICAL
2025-12-16 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Information Disclosure Linux Red Hat Suse
Critical
Disputed · 9.8 Vendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Severity by source

Sources disagree (Medium–Critical)
Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
6.1 MEDIUM

Requires locally supplying/mounting a crafted F2FS image (AV:L, PR:L); primary impact is kernel crash (A:H) with possible limited memory disclosure (C:L), no integrity impact.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
5.3 MEDIUM
AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Jul 30, 2026 - 06:41 vuln.today
CVSS changed
Jul 30, 2026 - 06:37 NVD
9.8 (CRITICAL)
CVE Published
Dec 16, 2025 - 16:16 cve.org
CRITICAL 9.8
CVE Published
Dec 16, 2025 - 16:16 nvd
UNKNOWN (no severity yet)

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix to detect potential corrupted nid in free_nid_list

As reported, on-disk footer.ino and footer.nid is the same and out-of-range, let's add sanity check on f2fs_alloc_nid() to detect any potential corruption in free_nid_list.

AnalysisAI

Improper validation of node identifiers (nid) in the Linux kernel's F2FS filesystem allows a crafted or corrupted on-disk image to pass an out-of-range nid (where footer.ino equals footer.nid and both exceed valid bounds) through f2fs_alloc_nid() and free_nid_list, potentially causing out-of-bounds access, memory corruption, or a kernel crash. The upstream fix adds a sanity check to detect this corruption. There is no public exploit identified at time of analysis, and the EPSS score is very low (0.02%, 6th percentile). Note the published CVSS 9.8 network vector appears inconsistent with the local, filesystem-image-driven nature of this bug.

Technical ContextAI

F2FS (Flash-Friendly File System) is a log-structured filesystem in the Linux kernel optimized for flash/NAND storage. It tracks node blocks (inodes, indirect nodes) via node identifiers (nids) managed through the Node Address Table (NAT) and an in-memory free_nid_list from which f2fs_alloc_nid() draws. The vulnerability class is improper validation of an untrusted on-disk value (akin to CWE-20 / CWE-129, out-of-bounds indexing) - a footer where ino == nid and both are out of the valid nid range slips through without a bounds check, so downstream code may index NAT/node structures using an invalid nid. The CWE was not assigned in the source data. Affected CPE strings were not provided; the fix commits target the upstream kernel and its stable branches.

Affected ProductsAI

The Linux kernel's F2FS subsystem is affected. Exact affected version ranges and fixed versions were not enumerated in the provided data (no CPE strings supplied); remediation is delivered through the mainline and stable-tree commits referenced at git.kernel.org (commits 6b9525596a83, 8fc6056dcf79, 9337ed5e777e, adbcb34f03ab, and 88b2ddb0c4f1), which indicate backports across multiple stable branches. Distributions shipping F2FS support (major desktop/server distros, and notably Android devices, which rely heavily on F2FS) inherit the fix once they rebase to a patched stable kernel.

RemediationAI

Upstream fix available (commits/stable backports); a single released patched version is not independently confirmed from the provided data - apply the stable-kernel update from your distribution that incorporates the referenced commits (git.kernel.org/stable/c/6b9525596a83cd5b7bbc2c7bd5f9ad9cf5ad60fa and the four sibling commits 8fc6056dcf79, 9337ed5e777e, adbcb34f03ab, 88b2ddb0c4f1). Until patched, reduce exposure by not mounting untrusted or attacker-supplied F2FS images and by restricting who can mount removable/loopback filesystems (e.g., avoid automounting untrusted USB media, drop unnecessary CAP_SYS_ADMIN, and disable udisks/automount for untrusted devices) - the trade-off is reduced convenience for removable-media workflows. On systems that do not use F2FS at all, avoiding loading the f2fs module removes the attack surface entirely with no functional impact.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 16.0 Not-Affected

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CVE-2025-68315 vulnerability details – vuln.today
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