7.8

CVE-2025-21703

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

netem: Update sch->q.qlen before qdisc_tree_reduce_backlog()

qdisc_tree_reduce_backlog() notifies parent qdisc only if child
qdisc becomes empty, therefore we need to reduce the backlog of the
child qdisc before calling it. Otherwise it would miss the opportunity
to call cops->qlen_notify(), in the case of DRR, it resulted in UAF
since DRR uses ->qlen_notify() to maintain its active list.
Verknüpft mit AI von unstrukturierten Daten zu bestehenden CPE der NVD
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Data is provided by the National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 5.4.288 < 5.4.291
Linux ≫ Linux Kernel Version >= 5.10.232 < 5.10.235
Linux ≫ Linux Kernel Version >= 5.15.175 < 5.15.179
Linux ≫ Linux Kernel Version >= 6.1.121 < 6.1.129
Linux ≫ Linux Kernel Version >= 6.6.67 < 6.6.78
Linux ≫ Linux Kernel Version >= 6.12.6 < 6.12.14
Linux ≫ Linux Kernel Version >= 6.13 < 6.13.3
Linux ≫ Linux Kernel Version6.14 Updaterc1
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Type Source Score Percentile
EPSS FIRST.org 0.04% 0.108
CVSS Metriken
Source Base Score Exploit Score Impact Score Vector string
134c704f-9b21-4f2e-91b3-4a467353bcc0 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.