VulnerabilityPublished 25 Mar 2026Updated 5 Nov 2026

CVE-2026-23313: Linux kernel · i40e: Fix preempt count leak in napi poll tracepoint

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in fa5d5baf67f619c7aa70697a194b5a9edd9f5bb7 : update Linux kernel when convenient.

Data as of 5 Nov 2026, 22:04 UTC

Severity

Unrated

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

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, 2026-11-05.

Patch

Available – fixed in fa5d5baf67f619c7aa70697a194b5a9edd9f5bb7, dca4ea596a3b0a1b82bc1d9f3e4d88bd9ad9561f, b7e91827e1cf89cd34ad11dc8f8c010b70ab786e +2

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Mar 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 5 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 ≥ 6d4d584a7ea8fc8d2be77545cb503118c193738a, < fa5d5baf67f619c7aa70697a194b5a9edd9f5bb7	Fixed in fa5d5baf67f619c7aa70697a194b5a9edd9f5bb7
LinuxLinux	Affected ≥ 6d4d584a7ea8fc8d2be77545cb503118c193738a, < dca4ea596a3b0a1b82bc1d9f3e4d88bd9ad9561f	Fixed in dca4ea596a3b0a1b82bc1d9f3e4d88bd9ad9561f
LinuxLinux	Affected ≥ 6d4d584a7ea8fc8d2be77545cb503118c193738a, < b7e91827e1cf89cd34ad11dc8f8c010b70ab786e	Fixed in b7e91827e1cf89cd34ad11dc8f8c010b70ab786e
LinuxLinux	Affected ≥ 6d4d584a7ea8fc8d2be77545cb503118c193738a, < 9e0f091821571f0da387462803ee42f0bb157582	Fixed in 9e0f091821571f0da387462803ee42f0bb157582
LinuxLinux	Affected ≥ 6d4d584a7ea8fc8d2be77545cb503118c193738a, < 4b3d54a85bd37ebf2d9836f0d0de775c0ff21af9	Fixed in 4b3d54a85bd37ebf2d9836f0d0de775c0ff21af9
LinuxLinux	Affected =6.2	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: i40e: Fix preempt count leak in napi poll tracepoint Using get_cpu() in the tracepoint assignment causes an obvious preempt count leak because nothing invokes put_cpu() to undo it: softirq: huh, entered softirq 3 NET_RX with preempt_count 00000100, exited with 00000101? This clearly has seen a lot of testing in the last 3+ years... Use smp_processor_id() instead.

References

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