CVE-2025-38247: Linux kernel · 2
Affects Linux kernelSource GCVE Database
Not known to be exploited · CVSS 5.5 Medium.
Data as of 15 Nov 2026, 01:59 UTC
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitation evidence
Disclosed: evidence found.
CVE published 9 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 14 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 24.04 LTSlinux-azure-6.11pkg:deb/ubuntu/linux-azure-6.11?arch=source&distro=nobleOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSlinux-gcp-6.11pkg:deb/ubuntu/linux-gcp-6.11?arch=source&distro=nobleOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSlinux-hwe-6.11pkg:deb/ubuntu/linux-hwe-6.11?arch=source&distro=nobleOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSlinux-lowlatency-hwe-6.11pkg:deb/ubuntu/linux-lowlatency-hwe-6.11?arch=source&distro=nobleOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSlinux-raspi-realtimepkg:deb/ubuntu/linux-raspi-realtime?arch=source&distro=nobleOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSlinux-realtimepkg:deb/ubuntu/linux-realtime?arch=source&distro=nobleOther 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 has been implemented in the affected Linux kernel versions. Users should upgrade to patched kernel versions to remediate the issue. Since the input does not provide explicit patch versions or vendor advisory, verify with the Linux kernel or distribution vendor for the exact fixed versions and apply updates accordingly.
Description
CVE-2025-38247 is a vulnerability in the Linux kernel involving a leak of user namespace (userns) and possibly mount ID map (mnt_idmap) in the open_tree_attr(2) function. The issue arises because once want_mount_setattr() returns positively, finish_mount_kattr() must release the ->mnt_userns resource, but failure in do_mount_setattr() does not alter this, leading to a resource leak. This vulnerability affects specific Linux kernel versions including various 4.15.x, 5.0.x, and 5.3.x builds. The CVSS score is 5.5 (medium severity), indicating a moderate impact primarily on availability. No known exploits in the wild have been reported.
References
- ubuntu.com/security/CVE-2025-38247 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2025-38247 (opens in a new tab)
- git.kernel.org/linus/0748e553df0225754c316a92af3a77fdc057b358 (opens in a new tab)
- git.kernel.org/stable/c/0748e553df0225754c316a92af3a77fdc057b358 (opens in a new tab)
- git.kernel.org/stable/c/142db4e76110dd80239f4e79810f85ea1735ad60 (opens in a new tab)