CVE-2026-74390

Kernel memory corruption via unbounded RDMA page copy

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds write in Linux kernel irdma releases starting at 5.14 allows local users to corrupt kernel memory through RDMA ring sizing. The irdma_copy_user_pgaddrs loop treats a zero total_cnt as unlimited, allowing an oversized umem to cross the four-entry pgaddrmem array. Reaching the flaw requires low-privilege local access to an affected irdma RDMA path, and resulting corruption can destabilize or crash the system.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Linux kernel irdma releases starting at 5.14 allows local users to corrupt kernel memory through RDMA ring sizing. The irdma_copy_user_pgaddrs loop treats a zero total_cnt as unlimited, allowing an oversized umem to cross the four-entry pgaddrmem array. Reaching the flaw requires low-privilege local access to an affected irdma RDMA path, and resulting corruption can destabilize or crash the system.

The record

CVE
CVE-2026-74390
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.14
  2. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <192a3be0e3759daa24af2841208b074ca6dbaabc
  3. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <424d51d33c7541a86934067c2c0538124687fc90
  4. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <4780f58672ee6328accd54a95f9c00683477e499
  5. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <5ebb3ed757be3e04cf803026004aa0beaeb13e9b
  6. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <79a20a8e201a779224b4bf115250a7713bde72c0
  7. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <9f8f0d2099e3de1194e37dc933ae0c4206b09aaf
  8. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <abd27a977b419d584efa659488c22d2306987b29

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.14; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <192a3be0e3759daa24af2841208b074ca6dbaabc; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <424d51d33c7541a86934067c2c0538124687fc90; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <4780f58672ee6328accd54a95f9c00683477e499; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <5ebb3ed757be3e04cf803026004aa0beaeb13e9b; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <79a20a8e201a779224b4bf115250a7713bde72c0; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <9f8f0d2099e3de1194e37dc933ae0c4206b09aaf; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <abd27a977b419d584efa659488c22d2306987b29

Published CVSS scores

7.8Linux CVE recordCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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