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CVE Record

CVE-2025-40077: f2fs: fix to avoid overflow while left shift operation

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid overflow while left shift operation Should cast type of folio->index from pgoff_t to loff_t to avoid overflow while left shift operation.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2025-40077 is a Linux kernel flaw in the F2FS filesystem code. The issue involves an integer overflow during a shift operation. Public sources do not describe business impact, attacker requirements, or severity, so urgency should be driven by whether your Linux estate uses affected kernels and F2FS.

Executive priority

Treat this as a kernel hygiene item unless your environment relies on F2FS. There is not enough public evidence to justify emergency response, but affected Linux kernels should be patched through normal vulnerability management.

Technical view

The Linux kernel F2FS fix casts folio->index from pgoff_t to loff_t before a left shift to avoid overflow. The source bundle does not identify the affected function path, impact class, privilege requirements, CVSS score, CWE, or exploitability details.

Likely exposure

Exposure is limited to Linux systems running affected kernel revisions with relevant F2FS code present or in use. The source bundle lists Linux as affected but does not provide a clear operational product matrix or distribution package mapping.

Exploitation context

No active exploitation is indicated. The CVE is not listed as KEV in the provided bundle, and no cited source describes public exploitation, proof of concept activity, or attacker tradecraft.

Researcher notes

The available evidence is minimal: a kernel arithmetic overflow fix and stable commit references. Avoid assigning impact beyond overflow avoidance unless vendor advisories or patch analysis establish reachable behavior and security consequences.

Mitigation direction

  • Track vendor kernel advisories for CVE-2025-40077.
  • Update to a kernel build containing the referenced stable fixes.
  • Prioritize systems that use or mount F2FS filesystems.
  • If patch timing is unclear, ask the OS vendor for fixed package mapping.

Validation and detection

  • Inventory Linux kernel versions across managed systems.
  • Identify systems with F2FS enabled, mounted, or supported.
  • Compare kernel source or package changelogs against referenced stable commits.
  • Confirm distribution advisories map CVE-2025-40077 to installed packages.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2025-40077 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
0ADP providers
5Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux3265d3db1f16395cfc6b8ea9b31b4001d98d05ef, 3265d3db1f16395cfc6b8ea9b31b4001d98d05ef, 3265d3db1f16395cfc6b8ea9b31b4001d98d05ef, 3265d3db1f16395cfc6b8ea9b31b4001d98d05efunaffected
LinuxLinux5.8, 0, 6.6.117, 6.12.59, 6.17.3, 6.18affected
Weakness

CWE details

No CWE listed

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