CVE-2026-31493VulnerabilityPublished 23 Apr 2026Updated 25 Sep 2026

Microsoft · RDMA/efa: Fix use of completion ctx after free

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-31493· High

Not known to be exploited · fixed in ef3b06742c8a201d0e83edc9a33a89a4fe3009f8 : patch Microsoft soon.

Data as of 30 Oct 2026, 06:59 UTC

Severity

High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in ef3b06742c8a201d0e83edc9a33a89a4fe3009f8, 8c24b5179af260a5f36571c992d29aab1f448544, 7ba09d85f177e9f5f64b881f33dbcb57b2cf23d5 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 22 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

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What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 68fb9f3e312a36e49fd05ec2d6b668daf2c4931a, < ef3b06742c8a201d0e83edc9a33a89a4fe3009f8	Fixed in ef3b06742c8a201d0e83edc9a33a89a4fe3009f8
LinuxLinux	Affected ≥ 68fb9f3e312a36e49fd05ec2d6b668daf2c4931a, < 8c24b5179af260a5f36571c992d29aab1f448544	Fixed in 8c24b5179af260a5f36571c992d29aab1f448544
LinuxLinux	Affected ≥ 68fb9f3e312a36e49fd05ec2d6b668daf2c4931a, < 7ba09d85f177e9f5f64b881f33dbcb57b2cf23d5	Fixed in 7ba09d85f177e9f5f64b881f33dbcb57b2cf23d5
LinuxLinux	Affected ≥ 68fb9f3e312a36e49fd05ec2d6b668daf2c4931a, < 1cf95fe5dc5471efea947b4c6f8913da6bc7976e	Fixed in 1cf95fe5dc5471efea947b4c6f8913da6bc7976e
LinuxLinux	Affected ≥ 68fb9f3e312a36e49fd05ec2d6b668daf2c4931a, < 0dd98aea1c0c45987fa2dd92f988b0eb1a72c125	Fixed in 0dd98aea1c0c45987fa2dd92f988b0eb1a72c125
LinuxLinux	Affected =5.12	Fixed in–

Description

CVE-2026-31493 is a vulnerability in Microsoft software related to RDMA/efa where a completion context is used after it has been freed. This use-after-free flaw can lead to undefined behavior or potential security issues. The affected versions explicitly include 2.0 and 3.0. No CVSS score or detailed impact information is provided. There is no indication of known exploits in the wild or available patches at this time.

Impact

The impact is not explicitly detailed in the available information. Use-after-free vulnerabilities can lead to application crashes, memory corruption, or potentially arbitrary code execution depending on context, but no specific impact or exploitation details are provided here.

Summary

This vulnerability involves the improper use of a completion context after it has been freed in the RDMA/efa component of Microsoft software. The flaw could potentially cause memory corruption or other unintended behavior due to use-after-free. The affected versions are 2.0 and 3.0. No further technical details or exploitation methods are described in the provided data.

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What to do

Affected software

Description

AI analysisMachine-generated, updated 29 Jun 2026, 22:52 UTC

Technical details

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