7.8
High
CVE-2025-21703 In the Linux kernel, the following vulnerability has been resolved: netem: Update sch->q.qlen before…
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux 6.14 | earliest → < 6.14 | 6.14 |
| Linux | 6.13 | 6.13.3 |
| Linux 6.12 | earliest → < 6.12.14 | 6.12.14 |
| Linux 6.6 | earliest → < 6.6.78 | 6.6.78 |
| Linux 6.1 | earliest → < 6.1.129 | 6.1.129 |
| Linux 5.15 | earliest → < 5.15.179 | 5.15.179 |
| Linux 5.10 | earliest → < 5.10.235 | 5.10.235 |
| Linux 5.4 | earliest → < 5.4.291 | 5.4.291 |
| SIMATIC S7-1500 TM MFP - BIOS | Versions not published |
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| Product | Affected versions | Fixed in |
|---|---|---|
| SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | Versions not published |
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