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CVE-2026-98899VulnerabilityPublished Updated

Microsoft · netfilter: ipset: mark the rcu locked areas properly

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-98899· High 7.8

Not known to be exploited · CVSS 7.8 High · fixed in eee5172741b2c0e73210020732043e5d589295d3 : patch Microsoft soon.

Data as of 2 Nov 2026, 10:58 UTC

CVSS 3.1 base score
7.8High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (Linux)CVSS 3.17.8
EPSS
0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in eee5172741b2c0e73210020732043e5d589295d3, ecb48c6b9edc78de8dd456c365727ae14b88c1ee, ca9fab1ca15534cef1630e81a479e94b3bbcdb6a +6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 23 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 2 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • >=5.4.24 <5.5
  • >=5.5.8 <5.6
Fixed in
  • eee5172741b2c0e73210020732043e5d589295d3
  • ecb48c6b9edc78de8dd456c365727ae14b88c1ee
  • ca9fab1ca15534cef1630e81a479e94b3bbcdb6a
  • 892399abd1a005a455d5b74d86d82b9773405f2b
  • 67bd3d2350d17c2f4fb158c3f917c10b15ecbc94
  • 5d0c22e73656d050daffad10a2ba8765ce8441c8
  • 5.6
  • 5.5
  • 0c46c9ce24130657ec7460c27fba5d445f5abd06
LinuxLinuxAffected
  • =5.6
Fixed in–

Description

CVE-2026-98899 is a vulnerability related to netfilter's ipset component involving improper marking of RCU locked areas. The advisory provides no further technical details or impact description. The affected versions are Microsoft products version 3.0 and 4.0. No CVSS score or exploit information is available.

References

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