CVE-2023-4623High· 7.8▾ TwilightA use-after-free vulnerability in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component can be exploited to achieve local privilege escalation. If a class with a link-sharing curve (i.e. with the HFSC_FSC flag se…
▾ 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
0.3%
0.3% → 0.3%
A use-after-free vulnerability in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component can be exploited to achieve local privilege escalation.
If a class with a link-sharing curve (i.e. with the HFSC_FSC flag set) has a parent without a link-sharing curve, then init_vf() will call vttree_insert() on the parent, but vttree_remove() will be skipped in update_vf(). This leaves a dangling pointer that can cause a use-after-free.
We recommend upgrading past commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f.
linux_kernel >= 2.6.12, < 4.14.327linux_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, < 6.1.53linux_kernel >= 6.2, < 6.4.16linux_kernel >= 6.5, < 6.5.3debian_linux = 10.0Upgrade past the affected range:
linux_kernel 6.5.3Connected by shared product, vendor, weakness, or advisory.
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