VulnerabilityPublished 28 Oct 2025Updated 21 Oct 2026

CVE-2025-40057: Linux kernel · ptp: Add a upper bound on max_vclocks

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in e9f35294e18da82162004a2f35976e7031aaf7f9 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:18 UTC

Severity

Unrated

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 16% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in e9f35294e18da82162004a2f35976e7031aaf7f9, da513f2ad1b1b1cf1880ccc2603ce1f1f818eb2e, 35ce5f163889dbce88eda1df661b357a09bbed87 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Oct 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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 Linux kernel to e9f35294e18da82162004a2f35976e7031aaf7f9, da513f2ad1b1b1cf1880ccc2603ce1f1f818eb2e, 35ce5f163889dbce88eda1df661b357a09bbed87 or 8dd446056336faa2283d62cefc2f576536845edc.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 73f37068d540eba5f93ba3a0019bf479d35ebd76, < e9f35294e18da82162004a2f35976e7031aaf7f9	Fixed in e9f35294e18da82162004a2f35976e7031aaf7f9
LinuxLinux	Affected ≥ 73f37068d540eba5f93ba3a0019bf479d35ebd76, < da513f2ad1b1b1cf1880ccc2603ce1f1f818eb2e	Fixed in da513f2ad1b1b1cf1880ccc2603ce1f1f818eb2e
LinuxLinux	Affected ≥ 73f37068d540eba5f93ba3a0019bf479d35ebd76, < 35ce5f163889dbce88eda1df661b357a09bbed87	Fixed in 35ce5f163889dbce88eda1df661b357a09bbed87
LinuxLinux	Affected ≥ 73f37068d540eba5f93ba3a0019bf479d35ebd76, < 8dd446056336faa2283d62cefc2f576536845edc	Fixed in 8dd446056336faa2283d62cefc2f576536845edc
LinuxLinux	Affected =5.14	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: ptp: Add a upper bound on max_vclocks syzbot reported WARNING in max_vclocks_store. This occurs when the argument max is too large for kcalloc to handle. Extend the guard to guard against values that are too large for kcalloc

References

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