CVE-2026-89575: Linux kernel · dm raid1: reserve space for NUL-terminator in build_constructor_string()
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 01:01 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 11 Sep 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
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.
Description
In the Linux kernel, the following vulnerability has been resolved: dm raid1: reserve space for NUL-terminator in build_constructor_string() Reserve space for the termination NUL after the maximum 20 decimal digits of a long long value to avoid buffer overflow in sprintf().
References
- ubuntu.com/security/CVE-2026-89575 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-89575 (opens in a new tab)
- git.kernel.org/linus/73c37fe54cd056d07461b142ab0b8b81e1ef6ad8 (opens in a new tab)
- git.kernel.org/stable/c/0a3657ebd6b517b60cdc5123894047616974e25b (opens in a new tab)
- git.kernel.org/stable/c/644140527ae494cedf3b5c0ecd16287deaea7a66 (opens in a new tab)
- git.kernel.org/stable/c/73c37fe54cd056d07461b142ab0b8b81e1ef6ad8 (opens in a new tab)
- git.kernel.org/stable/c/f79b53ca3a68a46c6fc3b30b148d1dfb1b33ea8b (opens in a new tab)