VulnerabilityPublished 22 Apr 2026Updated 21 Oct 2026

CVE-2026-31493: Linux kernel · RDMA/efa: Fix use of completion ctx after free

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in ef3b06742c8a201d0e83edc9a33a89a4fe3009f8 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Unrated

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
Weaponised: 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 26 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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.

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

In the Linux kernel, the following vulnerability has been resolved: RDMA/efa: Fix use of completion ctx after free On admin queue completion handling, if the admin command completed with error we print data from the completion context. The issue is that we already freed the completion context in polling/interrupts handler which means we print data from context in an unknown state (it might be already used again). Change the admin submission flow so alloc/dealloc of the context will be symmetric and dealloc will be called after any potential use of the context.

References

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