SB2025090887 - Integer underflow in Linux kernel net
Published: September 8, 2025
Security Bulletin ID
SB2025090887
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Integer underflow (CVE-ID: CVE-2025-39677)
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 website.