VDB
DEBIAN-CVE-2025-21703
DEBIAN-CVE-2025-21703
PUBLISHED
CVSS 7.800000190734863 HIGH
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.
Risk Scores
CVSS 3.1
7.800000190734863
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Debian:11 | linux-6.1 | 6.1.119-1, *, 6.1.128-1 |
| Debian:14 | linux | 0, 0 |
| Debian:12 | linux | 6.1.94-1, 6.1.98-1, 6.1.99-1 |
| Debian:13 | linux | 0, 0 |
| Debian:11 | linux | 5.10.70-1, 5.10.103-1, 5.10.113-1 |
Timeline
- Feb 18, 2025 CVE Published
- Apr 28, 2026 CVE Updated