PT-2026-39078 · Linux · Linux Kernel
CVSS v4.0
6.8
Medium
| Vector | AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
An issue exists in the
sched/mmcid component regarding the handling of vfork() and CLONE VM. A logic error occurs when the number of tasks associated with a process is smaller than the number of MMCID users. The system incorrectly accounts for already processed tasks while searching the task list for a vfork()ed task. If this leads to the number of tasks to be handled reaching zero, the walk stops without fixing the vfork()ed task's CID. This results in a failure to acquire a transitional CID during a subsequent schedule in, causing the machine to stall. This can lead to a state where a task endlessly loops in the mm get cid() function.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
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Related Identifiers
Affected Products
Linux Kernel