Vulnerability Database

318,756

Total vulnerabilities in the database

CVE-2025-38193

In the Linux kernel, the following vulnerability has been resolved:

net_sched: sch_sfq: reject invalid perturb period

Gerrard Tai reported that SFQ perturb_period has no range check yet, and this can be used to trigger a race condition fixed in a separate patch.

We want to make sure ctl->perturb_period * HZ will not overflow and is positive.

tc qd add dev lo root sfq perturb -10 # negative value : error Error: sch_sfq: invalid perturb period.

tc qd add dev lo root sfq perturb 1000000000 # too big : error Error: sch_sfq: invalid perturb period.

tc qd add dev lo root sfq perturb 2000000 # acceptable value tc -s -d qd sh dev lo qdisc sfq 8005: root refcnt 2 limit 127p quantum 64Kb depth 127 flows 128 divisor 1024 perturb 2000000sec Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0

  • Published: Jul 4, 2025
  • Updated: Dec 19, 2025
  • CVE: CVE-2025-38193
  • Severity: Medium
  • Exploit:

CVSS v3:

  • Severity: Medium
  • Score: 5.5
  • AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWEs:

Software From Fixed in
linux / linux_kernel 2.6.13 5.4.297
linux / linux_kernel 5.5 5.10.240
linux / linux_kernel 5.11 5.15.186
linux / linux_kernel 5.16 6.1.142
linux / linux_kernel 6.2 6.6.95
linux / linux_kernel 6.7 6.12.35
linux / linux_kernel 6.13 6.15.4
linux / linux_kernel 2.6.12 2.6.12.x
linux / linux_kernel 2.6.12-rc2 2.6.12-rc2.x
linux / linux_kernel 2.6.12-rc3 2.6.12-rc3.x
linux / linux_kernel 2.6.12-rc4 2.6.12-rc4.x
linux / linux_kernel 2.6.12-rc5 2.6.12-rc5.x
linux / linux_kernel 6.16-rc1 6.16-rc1.x
debian / debian_linux 11.0 11.0.x