VulnerabilityPublished 28 Oct 2025Updated 30 Oct 2026

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

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in ef49378864bb1ed14cd48c8e687729e12714d849 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 12:33 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Patch: Available – fixed in ef49378864bb1ed14cd48c8e687729e12714d849, 57d3381dfb97ff73ddd18601017fec21cca80985, 7fb12f75da1da83b29964c02646f851d919301ea +2

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Oct 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 30 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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 ≥ 3265d3db1f16395cfc6b8ea9b31b4001d98d05ef, < ef49378864bb1ed14cd48c8e687729e12714d849	Fixed in ef49378864bb1ed14cd48c8e687729e12714d849
LinuxLinux	Affected ≥ 3265d3db1f16395cfc6b8ea9b31b4001d98d05ef, < 57d3381dfb97ff73ddd18601017fec21cca80985	Fixed in 57d3381dfb97ff73ddd18601017fec21cca80985
LinuxLinux	Affected ≥ 3265d3db1f16395cfc6b8ea9b31b4001d98d05ef, < 7fb12f75da1da83b29964c02646f851d919301ea	Fixed in 7fb12f75da1da83b29964c02646f851d919301ea
LinuxLinux	Affected ≥ 3265d3db1f16395cfc6b8ea9b31b4001d98d05ef, < 0fe1c6bec54ea68ed8c987b3890f2296364e77bb	Fixed in 0fe1c6bec54ea68ed8c987b3890f2296364e77bb
LinuxLinux	Affected ≥ 3265d3db1f16395cfc6b8ea9b31b4001d98d05ef, < 0e75a098b0a37f02ca31fe99ac16004c8163cf67	Fixed in 0e75a098b0a37f02ca31fe99ac16004c8163cf67
LinuxLinux	Affected =5.8	Fixed in–

Description

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.

References

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