An issue was discovered in the Linux kernel 4.18 through 5.6.11 when unprivileged user namespaces are allowed. A user can create their own PID namespace, and mount a FUSE filesystem. Upon interaction with this FUSE filesystem, if the userspace component is terminated via a kill of the PID namespace's pid 1, it will result in a hung task, and resources being permanently locked up until system reboot. This can result in resource exhaustion.
Fix
Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.
Change history 1
- First seenCVSS 4.7 · linuxNVD modified 2026-10-08 21:17
Affected (CPE criteria) 1
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
References 8
- http://www.openwall.com/lists/oss-security/2020/08/24/1 Mailing List, Third Party Advisory
- https://github.com/sargun/fuse-example Exploit, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20200608-0001/ Third Party Advisory
- https://sourceforge.net/p/fuse/mailman/message/36598753/ Exploit, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/08/24/1 Mailing List, Third Party Advisory
- https://github.com/sargun/fuse-example Exploit, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20200608-0001/ Third Party Advisory
- https://sourceforge.net/p/fuse/mailman/message/36598753/ Exploit, Third Party Advisory