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CVE-2026-99057VulnerabilityPublished Updated

Microsoft · xen/netfront: don't leak the skb when xennet_fill_frags() fails

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-99057· Medium

Not known to be exploited · fixed in 99011a11c97340ef7290df7dc199305c73fab2f2 : update Microsoft when convenient.

Data as of 7 Nov 2026, 12:32 UTC

Severity
Medium

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in 99011a11c97340ef7290df7dc199305c73fab2f2, 086944c1c2cbb683543bc3ff08637847b03c8009, 5051df031144753d3e18862514969146b601d089 +9

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 7 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • >=4.4.159 <4.5
  • >=4.9.130 <4.10
  • >=4.14.73 <4.15
  • >=4.18.11 <4.19
Fixed in
  • 99011a11c97340ef7290df7dc199305c73fab2f2
  • 086944c1c2cbb683543bc3ff08637847b03c8009
  • 5051df031144753d3e18862514969146b601d089
  • 93ccaf1c26e2133396173b76a071e59024daa622
  • 84e3ea6502b5f14ce8d499d0b6e0e38386274cf0
  • 53a131eb2a998c77e2851401b32b712d6c6e8487
  • 6e6bd1051daabc327233c3ca3d00613fc6783c8e
  • 4.19
  • 4.15
  • 4.10
  • 4.5
  • 0cf0a25a639c535146c5eb4480d256995721aed6
LinuxLinuxAffected
  • =4.19
Fixed in–

Description

A vulnerability identified as CVE-2026-99057 affects Microsoft products versions 3.0 and 4.0. The issue relates to the xen/netfront component where the skb (socket buffer) is leaked when the function xennet_fill_frags() fails. No CVSS score or detailed impact information is provided.

References

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