CVE-2026-74389: Linux kernel · RDMA/hns: Fix log flood after cmd_mbox failure
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 7.0.0-1014.14~24.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 7.0.0-1014.14~24.04.1, 7.0.0-1017.17~24.04.1, 7.0.0-1016.16~24.04.1 +11
Exploitation evidence
Disclosed: evidence found.
CVE published 15 Aug 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.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A patch is available and should be applied to affected linux-azure kernel versions to replace the logging functions with rate-limited versions, preventing log flooding and potential system crashes.
Description
A vulnerability in the Linux kernel's RDMA hns driver caused excessive logging after a command mailbox failure, potentially leading to log flooding and system crashes. The issue was due to the use of non-rate-limited error logging functions. This has been fixed by replacing these with rate-limited versions to prevent log flooding. The vulnerability affects specific linux-azure kernel versions. A patch is available to address this issue.
References
- nvd.nist.gov/vuln/detail/CVE-2026-74389 (opens in a new tab)
- git.kernel.org/stable/c/66f44ec974ab372e4e1ee9eac4245237c94e8f68 (opens in a new tab)
- git.kernel.org/stable/c/7d9fbee252f84de3e6947a40eec01481c9d8afbb (opens in a new tab)
- git.kernel.org/stable/c/bbd97d71e53e551890e4115ad9de46b5f2ac0858 (opens in a new tab)
- git.kernel.org/stable/c/f3c9e84268e9fa613d40d6c138fb6969c35879b5 (opens in a new tab)
- ubuntu.com/security/CVE-2026-74389 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-74389 (opens in a new tab)
- git.kernel.org/linus/bbd97d71e53e551890e4115ad9de46b5f2ac0858 (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8889-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-3 (opens in a new tab)