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CVE-2026-99138VulnerabilityPublished

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

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-99138· High

Not known to be exploited · fixed in 86814e5370068ec2bf0caa6e6d55c3e5bfc6c324 : 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 86814e5370068ec2bf0caa6e6d55c3e5bfc6c324, 385e474086c2e7e29e2dded690be40dc273e20ee, 39aa489e85752f9de214edb0f85e4d578e57af29

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 86814e5370068ec2bf0caa6e6d55c3e5bfc6c324, 385e474086c2e7e29e2dded690be40dc273e20ee or 39aa489e85752f9de214edb0f85e4d578e57af29.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2, < 86814e5370068ec2bf0caa6e6d55c3e5bfc6c324
Fixed in
  • 86814e5370068ec2bf0caa6e6d55c3e5bfc6c324
LinuxLinuxAffected
  • ≥ 0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2, < 385e474086c2e7e29e2dded690be40dc273e20ee
Fixed in
  • 385e474086c2e7e29e2dded690be40dc273e20ee
LinuxLinuxAffected
  • ≥ 0baf26b0fcd74bbfcef53c5d5e8bad2b99c8d0d2, < 39aa489e85752f9de214edb0f85e4d578e57af29
Fixed in
  • 39aa489e85752f9de214edb0f85e4d578e57af29
LinuxLinuxAffected
  • =5.6
Fixed in–
Linuxlinux/kernelpkg:deb/linux/kernelOther threatsAffected
  • =5.6
Fixed in–

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

Description

A use-after-free vulnerability exists in the TCP implementation related to the do_tcp_getsockopt function when handling TCP_CC_INFO. This flaw could potentially lead to memory corruption or instability in affected software version 3.0.

References

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