CVE-2025-21703
Published: Feb 18, 2025
Modified: May 23, 2026
CVSS v3.1
7.8
Description
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.
| Vendor | Product | Versions |
|---|---|---|
Linux | Linux | affected 83c6ab12f08dcc09d4c5ac86fdb89736b28f1d31 - < e395fec75ac2dbffc99b4bce57b7f1f3c5449f2caffected 216509dda290f6db92c816dd54b83c1df9da9e76 - < 7f31d74fcc556a9166b1bb20515542de7bb939d1affected c2047b0e216c8edce227d7c42f99ac2877dad0e4 - < 98a2c685293aae122f688cde11d9334dddc5d207affected 10df49cfca73dfbbdb6c4150d859f7e8926ae427 - < 7b79ca9a1de6a428d486ff52fb3d602321c08f55affected 3824c5fad18eeb7abe0c4fc966f29959552dca3e - < 1f8e3f4a4b8b90ad274dfbc66fc7d55cb582f4d5+9 more versions |
Linux | Linux | affected 6.13unaffected 0 - < 6.13unaffected 5.4.291 - <= 5.4.*unaffected 5.10.235 - <= 5.10.*unaffected 5.15.179 - <= 5.15.*+5 more versions |
CVSS v3.1 Details
CVSS v3.1 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
References
Security Training
Train your team to recognize and prevent security threats with our comprehensive security awareness program.
Start TrainingVulnerability Scanning
Discover vulnerabilities in your applications and infrastructure before attackers do.
Scan Now