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CVE-2026-99126VulnerabilityPublished

Microsoft · s390/ctcm: Prevent XID null dereference

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-99126· Medium

Not known to be exploited · fixed in b264d8422779d69febce914efc47a92a85cc382c : update Microsoft when convenient.

Data as of 29 Oct 2026, 11:49 UTC

Severity
Medium

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in b264d8422779d69febce914efc47a92a85cc382c, 34fa3607b7604b3052b19cec8b0ad644818cdd2a, 8a2f7a4ad1d81612fa65bfa4d392ba1bb2f5eeab

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 b264d8422779d69febce914efc47a92a85cc382c, 34fa3607b7604b3052b19cec8b0ad644818cdd2a or 8a2f7a4ad1d81612fa65bfa4d392ba1bb2f5eeab.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 293d984f0e3604c04dcdbf00117ddc1e5d4b1909, < b264d8422779d69febce914efc47a92a85cc382c
Fixed in
  • b264d8422779d69febce914efc47a92a85cc382c
LinuxLinuxAffected
  • ≥ 293d984f0e3604c04dcdbf00117ddc1e5d4b1909, < 34fa3607b7604b3052b19cec8b0ad644818cdd2a
Fixed in
  • 34fa3607b7604b3052b19cec8b0ad644818cdd2a
LinuxLinuxAffected
  • ≥ 293d984f0e3604c04dcdbf00117ddc1e5d4b1909, < 8a2f7a4ad1d81612fa65bfa4d392ba1bb2f5eeab
Fixed in
  • 8a2f7a4ad1d81612fa65bfa4d392ba1bb2f5eeab
LinuxLinuxAffected
  • =2.6.26
Fixed in–

Description

CVE-2026-99126 is a vulnerability identified in Microsoft software version 3.0 related to the s390/ctcm component, specifically addressing a null pointer dereference issue involving XID. The advisory references Microsoft's support lifecycle but provides no detailed technical or impact information.

References

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