CVE-2026-99087: Linux kernel · dm-integrity: fix NULL pointer dereference when the 'R' flag is used
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 01:30 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 23 Oct 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.
AI-suggested
A patch has been applied to the Linux kernel to fix this issue by skipping writes during dm_integrity_resume when the device is activated in 'R' mode. Users should update to patched kernel versions to remediate this vulnerability.
Description
A vulnerability in the Linux kernel's dm-integrity subsystem causes a NULL pointer dereference leading to a crash when the device is activated with the 'R' flag and the SB_FLAG_DIRTY_BITMAP flag is set. The issue occurs during the dm_integrity_resume function's attempt to read the journal containing the bitmap. The patch modifies dm-integrity to skip writes during resume if the device is activated in 'R' mode.
References
- ubuntu.com/security/CVE-2026-99087 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-99087 (opens in a new tab)
- git.kernel.org/stable/c/2e25842f0e4423e0efb243f56153d842ed6b933f (opens in a new tab)
- git.kernel.org/stable/c/69ed43ed8a174465fca1ba6bfbde53e4618c8956 (opens in a new tab)
- git.kernel.org/stable/c/7d4d4f3b668d708d94f62ecdd33ac330a6fd8a84 (opens in a new tab)