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CVE-2026-98573VulnerabilityPublished Updated

skb_checksum_setup_ipv6() · net: skbuff: fix pull-bound underflow

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-98573· High

Not known to be exploited · fixed in d7f474226809471dc7877435e9c492cc914df0bf : patch Microsoft soon.

Data as of 2 Nov 2026, 10:58 UTC

Severity
High

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS
0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in d7f474226809471dc7877435e9c492cc914df0bf, cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962, b2da5ed3d8c75e1b729a21b6d3beaed415e263f6 +5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 18 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
  • ≥ 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3, < d7f474226809471dc7877435e9c492cc914df0bf
Fixed in
  • d7f474226809471dc7877435e9c492cc914df0bf
LinuxLinuxAffected
  • ≥ 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3, < cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962
Fixed in
  • cfa643f2ca36c6f913fe1a2ceb12412ebb0fd962
LinuxLinuxAffected
  • ≥ 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3, < b2da5ed3d8c75e1b729a21b6d3beaed415e263f6
Fixed in
  • b2da5ed3d8c75e1b729a21b6d3beaed415e263f6
LinuxLinuxAffected
  • ≥ 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3, < a0ad0473c09d2e947aecac5c82e637ec85924b12
Fixed in
  • a0ad0473c09d2e947aecac5c82e637ec85924b12
LinuxLinuxAffected
  • ≥ 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3, < 718747afa5463d9cc5fd9a09f03b2a492edd9b78
Fixed in
  • 718747afa5463d9cc5fd9a09f03b2a492edd9b78
LinuxLinuxAffected
  • ≥ 1431fb31ecbaba1b5718006128f0f2ed0b94e1c3, < 9c4e432132a97b82edf28fa172c39f743e6bfb26
Fixed in
  • 9c4e432132a97b82edf28fa172c39f743e6bfb26

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

A vulnerability identified as CVE-2026-98573 affects Microsoft products, specifically versions 3.0 and 4.0. It involves a pull-bound underflow issue in the skb_checksum_setup_ipv6() function within the network socket buffer (skbuff) handling. No CVSS score or detailed impact information is provided.

References

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