#VU114955 Integer underflow in Linux kernel - CVE-2025-39677
Published: September 8, 2025
Vulnerability identifier: #VU114955
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-39677
CWE-ID: CWE-191
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local user to execute arbitrary code.
The vulnerability exists due to integer underflow within the pie_change() function in net/sched/sch_pie.c, within the hhf_change() function in net/sched/sch_hhf.c, within the fq_pie_change() function in net/sched/sch_fq_pie.c, within the fq_codel_change() function in net/sched/sch_fq_codel.c, within the fq_load_priomap() and fq_change() functions in net/sched/sch_fq.c, within the codel_change() function in net/sched/sch_codel.c. A local user can execute arbitrary code.
Remediation
Install update from vendor's repository.