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Fencer Intel
high 8.4

CVE-2026-58302 json

rtapi_app in linuxcnc-uspace in LinuxCNC before 2.9.9 allows privilege escalation.

published 4mo ago modified 4mo ago also EUVD-2026-40241

cvss
8.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 9%
public exploits
0
none known

Summary

rtapi_app in linuxcnc-uspace in LinuxCNC before 2.9.9 allows privilege escalation. It is installed SUID root and loads shared library modules via dlopen() by using a user-supplied module name. Insufficient validation of the module name allows path traversal, enabling an unprivileged local user to load an arbitrary shared library. Because the process retains elevated privileges during module loading, this results in local privilege escalation to root.

Patch / fix

  • LinuxCNC LinuxCNC 2.9.9
  • linuxcnc Debian 12 2.9.0~pre1+git20230208.f1270d6ed7-1+deb12u2
  • linuxcnc Debian 13 1:2.9.4-2+deb13u1

debian advisories DEBIAN-CVE-2026-58302

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
4mo ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • LinuxCNC LinuxCNC

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.