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
CVSS
No CVSS.
References
Configurations
No configuration.
History
17 Jul 2025, 17:15
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| References |
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08 Jul 2025, 16:18
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| Summary |
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04 Jul 2025, 14:15
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Information
Published : 2025-07-04 14:15
Updated : 2025-07-17 17:15
NVD link : CVE-2025-38193
Mitre link : CVE-2025-38193
CVE.ORG link : CVE-2025-38193
JSON object : View
Products Affected
No product.
CWE
No CWE.