CVE-2025-21703High· 7.8▾ TwilightIn 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 …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Oct 15.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.3%
0.3% → 0.3%
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.
linux_kernel >= 5.4.288, < 5.4.291linux_kernel >= 5.10.232, < 5.10.235linux_kernel >= 5.15.175, < 5.15.179linux_kernel >= 6.1.121, < 6.1.129linux_kernel >= 6.6.67, < 6.6.78linux_kernel >= 6.12.6, < 6.12.14linux_kernel >= 6.13, < 6.13.3linux_kernel = 6.14Upgrade past the affected range:
linux_kernel 6.13.3Connected by shared product, vendor, weakness, or advisory.
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