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CVE-2026-31531VulnerabilityPublished Updated

rtm_get_nexthop() · ipv4: nexthop: allocate skb dynamically

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-31531· Medium

Not known to be exploited · fixed in 635038fe19db391117e66b46bdc2b6e447ac801d : update Microsoft when convenient.

Data as of 30 Oct 2026, 11:52 UTC

Severity
Medium

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

Thin evidence

One scorer or none
EPSS
0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 635038fe19db391117e66b46bdc2b6e447ac801d, 615517f3f8d53b0cf41507c7599971e17adfdfa5, 40bd39e383a0478fd5c221f393df05fd9d70cfbc +3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 23 Apr 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 30 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 430a049190de3c9e219f43084de9f1122da04570, < 635038fe19db391117e66b46bdc2b6e447ac801d
Fixed in
  • 635038fe19db391117e66b46bdc2b6e447ac801d
LinuxLinuxAffected
  • ≥ 430a049190de3c9e219f43084de9f1122da04570, < 615517f3f8d53b0cf41507c7599971e17adfdfa5
Fixed in
  • 615517f3f8d53b0cf41507c7599971e17adfdfa5
LinuxLinuxAffected
  • ≥ 430a049190de3c9e219f43084de9f1122da04570, < 40bd39e383a0478fd5c221f393df05fd9d70cfbc
Fixed in
  • 40bd39e383a0478fd5c221f393df05fd9d70cfbc
LinuxLinuxAffected
  • ≥ 430a049190de3c9e219f43084de9f1122da04570, < 18a4543c1750f96be63e349936d2dfdcb360b2dc
Fixed in
  • 18a4543c1750f96be63e349936d2dfdcb360b2dc
LinuxLinuxAffected
  • ≥ 430a049190de3c9e219f43084de9f1122da04570, < 14cf0cd35361f4e94824bf8a42f72713d7702a73
Fixed in
  • 14cf0cd35361f4e94824bf8a42f72713d7702a73
LinuxLinuxAffected
  • ≥ 430a049190de3c9e219f43084de9f1122da04570, < 5f479aac1262959e54cdd978d873be5f202e2a40
Fixed in
  • 5f479aac1262959e54cdd978d873be5f202e2a40

Description

CVE-2026-31531 is a vulnerability related to the IPv4 nexthop allocation process in Microsoft software versions 2.0 and 3.0. The issue involves dynamically allocating socket buffers (skb) in the rtm_get_nexthop() function. No detailed technical or impact information is provided, and no CVSS score is assigned.

References

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