CVE-2026-98984: Linux kernel · dcache: don't put a mountpoint on a dentry that's being removed
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 02:00 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 26.10linuxpkg:deb/ubuntu/linux?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-oraclepkg:deb/ubuntu/linux-oracle?arch=source&distro=stonkingOther 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 fix for this vulnerability is available in updated Linux kernel versions. Users should apply the official kernel updates that address this issue. Since the vulnerability involves kernel-level filesystem operations, upgrading to patched kernel versions is the recommended mitigation.
Description
CVE-2026-98984 is a Linux kernel vulnerability involving the dcache subsystem where a mountpoint can be incorrectly placed on a dentry that is in the process of being removed. This occurs due to a race condition between detach_mounts() and d_delete() operations, allowing a bind mount of a directory being removed to be moved beneath an existing mount, resulting in a mountpoint on a removed directory that cannot be detached. The issue has been resolved by ensuring proper locking and checks to prevent mounts on dentries being removed.
References
- ubuntu.com/security/CVE-2026-98984 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98984 (opens in a new tab)
- git.kernel.org/stable/c/30a1625022411a387cce9239408ece9955bc9c58 (opens in a new tab)
- git.kernel.org/stable/c/390ddcea2a8aca411b931a8e2863a80ccca8d2b3 (opens in a new tab)
- git.kernel.org/stable/c/5e6bfd9f249f2c74bb63c0f06ad959da3bee0971 (opens in a new tab)
- git.kernel.org/stable/c/75f4197f1e11d2eb75c2d6f916a7d4764db621e5 (opens in a new tab)
- git.kernel.org/stable/c/793cb67b0f52d00c67bd0e76bc57455b5c70ebb8 (opens in a new tab)