CVE-2025-21703
High
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.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Linux Kernel
PublishedFeb 18, 2025
First seenFeb 18, 2025
Weakness typeCWE-416Use after free
How to fix
Update
- linux linux_kernel5.4.291, 5.10.235, 5.15.179, 6.1.129, 6.6.78, 6.12.14, 6.13.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.4.288 ≤ v < 5.4.291, 5.10.232 ≤ v < 5.10.235, 5.15.175 ≤ v < 5.15.179, 6.1.121 ≤ v < 6.1.129, 6.6.67 ≤ v < 6.6.78, 6.12.6 ≤ v < 6.12.14, 6.13 ≤ v < 6.13.3, 6.14 | 5.4.291, 5.10.235, 5.15.179, 6.1.129, 6.6.78, 6.12.14, 6.13.3 |
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