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CVE-2026-98591VulnerabilityPublished Updated

Microsoft · bpf: Fix bounds check for skb-backed dynptrs

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-98591· High

Not known to be exploited · fixed in ed6eec97b534979dcf28b40c389cee57bd6561d4 : patch Microsoft soon.

Data as of 2 Nov 2026, 08:45 UTC

Severity
High

Rated by Threat Radar · CVSS not yet scored by NVD

Patch
Available – fixed in ed6eec97b534979dcf28b40c389cee57bd6561d4, 1196903a27cac5c929c7517e987a8d159f20c5e5, 37877a24758068742fef687a7cf5362360dde1d1 +2

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 18 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 1 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 6f5a630d7c57cd79b1f526a95e757311e32d41e5, < ed6eec97b534979dcf28b40c389cee57bd6561d4
Fixed in
  • ed6eec97b534979dcf28b40c389cee57bd6561d4
LinuxLinuxAffected
  • ≥ 6f5a630d7c57cd79b1f526a95e757311e32d41e5, < 1196903a27cac5c929c7517e987a8d159f20c5e5
Fixed in
  • 1196903a27cac5c929c7517e987a8d159f20c5e5
LinuxLinuxAffected
  • ≥ 6f5a630d7c57cd79b1f526a95e757311e32d41e5, < 37877a24758068742fef687a7cf5362360dde1d1
Fixed in
  • 37877a24758068742fef687a7cf5362360dde1d1
LinuxLinuxAffected
  • ≥ 6f5a630d7c57cd79b1f526a95e757311e32d41e5, < 39ffceaddb10753eac12785dba6ac0673860b4ac
Fixed in
  • 39ffceaddb10753eac12785dba6ac0673860b4ac
LinuxLinuxAffected
  • ≥ 6f5a630d7c57cd79b1f526a95e757311e32d41e5, < 1b923538598be768e9f2f258a77a083d00e0c78b
Fixed in
  • 1b923538598be768e9f2f258a77a083d00e0c78b
LinuxLinuxAffected
  • =6.6
Fixed in–

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

Description

CVE-2026-98591 is a vulnerability related to a bounds check issue for skb-backed dynamic pointers in Microsoft software versions 3.0 and 4.0. The advisory does not provide detailed technical information or impact specifics. No CVSS score or exploit information is available.

References

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