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CVE-2026-99139VulnerabilityPublished

do_tcp_getsockopt(TCP_CONGESTION) · tcp: fix use-after-free

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-99139· High

Not known to be exploited · fixed in c1804ef016392dd91267d2207ee43b1de34302ca : patch Microsoft soon.

Data as of 29 Oct 2026, 11:48 UTC

Severity
High

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in c1804ef016392dd91267d2207ee43b1de34302ca, a8e45471afa230c1431c26c8e99ec24377e3b514, 5271b79b7ad68dcb222e893773f92bdabf7750f3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 28 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 29 Oct 2026.

What to do

Upgrade Linux to c1804ef016392dd91267d2207ee43b1de34302ca, a8e45471afa230c1431c26c8e99ec24377e3b514 or 5271b79b7ad68dcb222e893773f92bdabf7750f3.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2, < c1804ef016392dd91267d2207ee43b1de34302ca
Fixed in
  • c1804ef016392dd91267d2207ee43b1de34302ca
LinuxLinuxAffected
  • ≥ 0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2, < a8e45471afa230c1431c26c8e99ec24377e3b514
Fixed in
  • a8e45471afa230c1431c26c8e99ec24377e3b514
LinuxLinuxAffected
  • ≥ 0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2, < 5271b79b7ad68dcb222e893773f92bdabf7750f3
Fixed in
  • 5271b79b7ad68dcb222e893773f92bdabf7750f3
LinuxLinuxAffected
  • =5.6
Fixed in–

Description

A use-after-free vulnerability exists in the TCP implementation related to the do_tcp_getsockopt function when handling TCP_CONGESTION. This flaw affects Microsoft product version 3.0. No CVSS score or detailed impact information is provided.

References

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