In the Linux kernel, the following vulnerability has been resolved:
net_sched: drr: Fix double list add in class with netem as child qdisc
As described in Gerrard's report [1], there are use cases where a netem
child qdisc will make the parent qdisc's enqueue callback reentrant.
In the case of drr, there won't be a UAF, but the code will add the same
classifier to the list twice, which will cause memory corruption.
In addition to checking for qlen being zero, this patch checks whether the
class was already added to the active_list (cl_is_active) before adding
to the list to cover for the reentrant case.
[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/
CVSS
No CVSS.
References
Configurations
No configuration.
History
03 Nov 2025, 20:18
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03 Nov 2025, 18:15
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04 Jun 2025, 13:15
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Information
Published : 2025-05-20 16:15
Updated : 2025-11-03 20:18
NVD link : CVE-2025-37915
Mitre link : CVE-2025-37915
CVE.ORG link : CVE-2025-37915
JSON object : View
Products Affected
No product.
CWE
No CWE.