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CVE-2026-99174VulnerabilityPublished

Microsoft · ext4: free the sbi after a grace period

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-99174· High

Not known to be exploited · fixed in c17b44266a1f9fcb49b894d4611d1254bf1aa313 : patch Microsoft soon.

Data as of 29 Oct 2026, 11:35 UTC

Severity
High

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in c17b44266a1f9fcb49b894d4611d1254bf1aa313, 87d29b8b849738d52fe820d495fa0aa2d5a1ec82, 80d5db1686b05fad6f384be017714297d828a714

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 c17b44266a1f9fcb49b894d4611d1254bf1aa313, 87d29b8b849738d52fe820d495fa0aa2d5a1ec82 or 80d5db1686b05fad6f384be017714297d828a714.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 6493792d3299b3e33f887ef8a150099d271faf9c, < c17b44266a1f9fcb49b894d4611d1254bf1aa313
Fixed in
  • c17b44266a1f9fcb49b894d4611d1254bf1aa313
LinuxLinuxAffected
  • ≥ 6493792d3299b3e33f887ef8a150099d271faf9c, < 87d29b8b849738d52fe820d495fa0aa2d5a1ec82
Fixed in
  • 87d29b8b849738d52fe820d495fa0aa2d5a1ec82
LinuxLinuxAffected
  • ≥ 6493792d3299b3e33f887ef8a150099d271faf9c, < 80d5db1686b05fad6f384be017714297d828a714
Fixed in
  • 80d5db1686b05fad6f384be017714297d828a714
LinuxLinuxAffected
  • =5.19
Fixed in–
Red Hatredhat/kernelpkg:rpm/redhat/kernelOther threatsAffected
  • =5.19
Fixed in–

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

Description

CVE-2026-99174 is a vulnerability related to the ext4 filesystem, specifically involving the freeing of the sbi (superblock info) after a grace period. The information provided is minimal and does not describe the nature of the flaw, its impact, or exploitation details.

References

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