CVE-2023-4921High· 7.8▾ TwilightA use-after-free vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation. When the plug qdisc is used as a class of the qfq qdisc, sending network packets triggers use-afte…
▾ 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 14.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.4%
0.4% → 0.4%
A use-after-free vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation.
When the plug qdisc is used as a class of the qfq qdisc, sending network packets triggers use-after-free in qfq_dequeue() due to the incorrect .peek handler of sch_plug and lack of error checking in agg_dequeue().
We recommend upgrading past commit 8fc134fee27f2263988ae38920bc03da416b03d8.
linux_kernel >= 3.8, < 4.14.326linux_kernel >= 4.15, < 4.19.295linux_kernel >= 4.20, < 5.4.257linux_kernel >= 5.5, < 5.10.195linux_kernel >= 5.11, < 5.15.132linux_kernel >= 5.16, < 6.1.54linux_kernel >= 6.2, < 6.5.4debian_linux = 10.0Upgrade past the affected range:
linux_kernel 6.5.4Connected by shared product, vendor, weakness, or advisory.
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