VulnerabilityPublished 15 Aug 2026Updated 6 Nov 2026

CVE-2026-72349: Linux kernel · netfilter: xt_rateest: fix u64 truncation in xt_rateest_mt()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in e702f6dd5d21e331f55fd9168c0210542008546d : update Linux kernel when convenient.

Data as of 6 Nov 2026, 17:19 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in e702f6dd5d21e331f55fd9168c0210542008546d, d5cc4c12a4b90bf099199c3c49ecda7e694f2a2b, bab305dd769d78074adca73505cc2509e1206bf2 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 15 Aug 2026
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 6 Nov 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 ≥ 1c0d32fde5bdf1184bc274f864c09799278a1114, < e702f6dd5d21e331f55fd9168c0210542008546d	Fixed in e702f6dd5d21e331f55fd9168c0210542008546d
LinuxLinux	Affected ≥ 1c0d32fde5bdf1184bc274f864c09799278a1114, < d5cc4c12a4b90bf099199c3c49ecda7e694f2a2b	Fixed in d5cc4c12a4b90bf099199c3c49ecda7e694f2a2b
LinuxLinux	Affected ≥ 1c0d32fde5bdf1184bc274f864c09799278a1114, < bab305dd769d78074adca73505cc2509e1206bf2	Fixed in bab305dd769d78074adca73505cc2509e1206bf2
LinuxLinux	Affected ≥ 1c0d32fde5bdf1184bc274f864c09799278a1114, < a3ba938f45cb00f6bf49d3aa3647df9b017f5f08	Fixed in a3ba938f45cb00f6bf49d3aa3647df9b017f5f08
LinuxLinux	Affected ≥ 1c0d32fde5bdf1184bc274f864c09799278a1114, < 444853cd438201007da5359821adcc2995655ab1	Fixed in 444853cd438201007da5359821adcc2995655ab1
LinuxLinux	Affected ≥ 1c0d32fde5bdf1184bc274f864c09799278a1114, < 905a927b2e6fec7b174e9e5644d271047b61378f	Fixed in 905a927b2e6fec7b174e9e5644d271047b61378f

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_rateest: fix u64 truncation in xt_rateest_mt() On links faster than ~34 Gbps, where byte rate may exceed 2^32-1 (~ 4.3 GBps), the comparison result becomes incorrect because the truncated value no longer reflects the actual estimator rate. Fix by changing the local variables to u64.

References

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