5.5

CVE-2025-38193

net_sched: sch_sfq: reject invalid perturb period

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
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 2.6.13 < 5.4.297
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.240
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.186
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.142
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.95
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.35
Linux ≫ Linux Kernel Version >= 6.13 < 6.15.4
Linux ≫ Linux Kernel Version2.6.12 Update-
Linux ≫ Linux Kernel Version2.6.12 Updaterc2
Linux ≫ Linux Kernel Version2.6.12 Updaterc3
Linux ≫ Linux Kernel Version2.6.12 Updaterc4
Linux ≫ Linux Kernel Version2.6.12 Updaterc5
Linux ≫ Linux Kernel Version6.16 Updaterc1
Debian ≫ Debian Linux Version11.0
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.16% 0.056
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-190 Integer Overflow or Wraparound

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

https://git.kernel.org/stable/c/956b5aebb349449b38d920d444ca1392d43719d1
Patch
https://git.kernel.org/stable/c/b11a50544af691b787384089b68f740ae20a441b
Patch
https://git.kernel.org/stable/c/0357da9149eac621f39e235a135ebf155f01f7c3
Patch
https://git.kernel.org/stable/c/f9b97d466e6026ccbdda30bb5b71965b67ccbc82
Patch
https://git.kernel.org/stable/c/590b2d7d0beadba2aa576708a05a05f0aae39295
Patch
https://git.kernel.org/stable/c/7ca52541c05c832d32b112274f81a985101f9ba8
Patch
https://git.kernel.org/stable/c/2254d038dab9c194fe6a4b1ce31034f42e91a6e5
Patch
https://git.kernel.org/stable/c/e0936ff56be4e08ad5b60ec26971eae0c40af305
Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Third Party Advisory