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CVE-2026-43199VulnerabilityPublished Updated

IPsec MAC address query · net/mlx5e: Fix "scheduling while atomic

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-43199· High 7.5

Not known to be exploited · CVSS 7.5 High · fixed in e1407fb7c337373dfaaae2445d828b0b9ae26a29 : patch Microsoft soon.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 35% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in e1407fb7c337373dfaaae2445d828b0b9ae26a29, 859380694f434597407632c29f30fdb5e763e6cc, 57957bc7f1865778ec9b1618e15515feb6df7eb4 +2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 May 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 30 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ cee137a634318bfbda18ee5af45d300153b57fa5, < e1407fb7c337373dfaaae2445d828b0b9ae26a29
Fixed in
  • e1407fb7c337373dfaaae2445d828b0b9ae26a29
LinuxLinuxAffected
  • ≥ cee137a634318bfbda18ee5af45d300153b57fa5, < 859380694f434597407632c29f30fdb5e763e6cc
Fixed in
  • 859380694f434597407632c29f30fdb5e763e6cc
LinuxLinuxAffected
  • ≥ cee137a634318bfbda18ee5af45d300153b57fa5, < 57957bc7f1865778ec9b1618e15515feb6df7eb4
Fixed in
  • 57957bc7f1865778ec9b1618e15515feb6df7eb4
LinuxLinuxAffected
  • ≥ cee137a634318bfbda18ee5af45d300153b57fa5, < 546de94e41e92e1f7dc6213615fb7c794d05db98
Fixed in
  • 546de94e41e92e1f7dc6213615fb7c794d05db98
LinuxLinuxAffected
  • ≥ cee137a634318bfbda18ee5af45d300153b57fa5, < 5efde07521309274f26727860774614cbc187242
Fixed in
  • 5efde07521309274f26727860774614cbc187242
LinuxLinuxAffected
  • =6.2
Fixed in–

Description

CVE-2026-43199 is a vulnerability related to the net/mlx5e driver component in Microsoft software, specifically addressing a "scheduling while atomic" issue in the IPsec MAC address query functionality. The affected version explicitly identified is version 3.0. No CVSS score is provided for this vulnerability. There are no known exploits in the wild at this time.

References

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