CVE-2026-99036: Linux kernel · dm: fix reading free memory in do_resume
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 28 Oct 2026, 01:45 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 has been implemented in the Linux kernel to address this race condition by reordering operations in the do_resume function. Users should update to a kernel version that includes this fix. Since the issue requires root privileges and concurrent ioctl calls that are uncommon in typical usage, no additional mitigation is generally required.
Description
A race condition in the Linux kernel device mapper (dm) subsystem was fixed where a function could read freed memory during concurrent ioctl calls. This issue occurs because dm_table_get_mode is called without holding locks, allowing a concurrent ioctl to swap the table and cause a use-after-free scenario. The flaw was identified by syzbot and fixed by changing the order of operations to read the mode before swapping the table. This is not considered a security bug since only root can trigger it and common tools do not invoke the vulnerable ioctls concurrently.
References
- ubuntu.com/security/CVE-2026-99036 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-99036 (opens in a new tab)
- git.kernel.org/stable/c/281f68d6cf8acb2547ebf0a849b8beae8fb0ec3c (opens in a new tab)
- git.kernel.org/stable/c/2c96d1a8324e7736e0f8a5790ecf39d36c2c4a82 (opens in a new tab)
- git.kernel.org/stable/c/301691c32b8ad023e3316d5dbb6a8cf52d47b0dc (opens in a new tab)
- git.kernel.org/stable/c/c9417c1c5269e2bd0570fbe53e4ec03a8d31f008 (opens in a new tab)
- git.kernel.org/stable/c/e3bf232c913b7e0103d323f15e6342d37cb1b357 (opens in a new tab)