VulnerabilityPublished 15 Aug 2026Updated 6 Nov 2026

CVE-2026-74346: Linux kernel · RDMA/irdma: Fix OOB read during CQ MR registration

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in d566002de555b18cc395012c5c1cb8682fc6d2a9 : patch Linux kernel soon.

Data as of 6 Nov 2026, 18:03 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in d566002de555b18cc395012c5c1cb8682fc6d2a9, d5aa82da8f65562da996d184686db9d0ea718b91, ad360a31092a870633ec255b96f50181628b4de0 +4

Exploitation evidence

Disclosed: evidence found.
CVE published 15 Aug 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 6 Nov 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.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ b48c24c2d710cf34810c555dcef883a3d35a9c08, < d566002de555b18cc395012c5c1cb8682fc6d2a9	Fixed in d566002de555b18cc395012c5c1cb8682fc6d2a9
LinuxLinux	Affected ≥ b48c24c2d710cf34810c555dcef883a3d35a9c08, < d5aa82da8f65562da996d184686db9d0ea718b91	Fixed in d5aa82da8f65562da996d184686db9d0ea718b91
LinuxLinux	Affected ≥ b48c24c2d710cf34810c555dcef883a3d35a9c08, < ad360a31092a870633ec255b96f50181628b4de0	Fixed in ad360a31092a870633ec255b96f50181628b4de0
LinuxLinux	Affected ≥ b48c24c2d710cf34810c555dcef883a3d35a9c08, < a80b3b13786e9ab1c52b31a1f16c7d6708fa9220	Fixed in a80b3b13786e9ab1c52b31a1f16c7d6708fa9220
LinuxLinux	Affected ≥ b48c24c2d710cf34810c555dcef883a3d35a9c08, < 4385ddd654d90245eeb83b3cb539670ab5c85ba4	Fixed in 4385ddd654d90245eeb83b3cb539670ab5c85ba4
LinuxLinux	Affected ≥ b48c24c2d710cf34810c555dcef883a3d35a9c08, < 3159c6fac43dc24b34d31971884d98a7a1bf4c4b	Fixed in 3159c6fac43dc24b34d31971884d98a7a1bf4c4b

AI-suggested

A fix is available and has been applied in several Linux kernel commits. Users should update to a Linux kernel version that includes these fixes to remediate the vulnerability.

Description

CVE-2026-74346 is a vulnerability in the Linux kernel's RDMA/irdma subsystem where an out-of-bounds (OOB) read occurs during completion queue (CQ) memory registration. The issue arises because a field tracking a feature flag was not set properly before CQ memory registration, causing incorrect memory access. This flaw has been fixed by removing the problematic field and directly checking the CQ resize feature flag.

Impact

The vulnerability can cause an out-of-bounds read in kernel memory during RDMA CQ memory registration, potentially leading to kernel crashes or information disclosure. However, no known exploits in the wild have been reported. The impact is limited to affected Linux kernel versions with the vulnerable RDMA/irdma implementation.

Summary

The vulnerability in Linux kernel RDMA/irdma involves an out-of-bounds read during CQ memory registration due to the cqmr->split field not being set until after CQ creation. This caused the code to incorrectly populate cqmr->shadow for GEN_2 hardware and beyond, leading to an OOB read when req->cq_pages equals the size of the memory array. The fix removes the cqmr->split field and checks the CQ resize feature flag directly, preventing the erroneous memory access.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 6 Nov 2026, 18:03 UTC

Technical details

References

Community reviews

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