CVE-2025-37915High· 7.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: net_sched: drr: Fix double list add in class with netem as child qdisc As described in Gerrard's report [1], there are use cases where a netem child qdisc will make th…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · 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
0.2%
0.2% → 0.2%
7.8 → 6.3
high → medium
6.3 → 7.8
medium → high
In the Linux kernel, the following vulnerability has been resolved:
net_sched: drr: Fix double list add in class with netem as child qdisc
As described in Gerrard's report [1], there are use cases where a netem child qdisc will make the parent qdisc's enqueue callback reentrant. In the case of drr, there won't be a UAF, but the code will add the same classifier to the list twice, which will cause memory corruption.
In addition to checking for qlen being zero, this patch checks whether the class was already added to the active_list (cl_is_active) before adding to the list to cover for the reentrant case.
[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/
linux_kernel >= 5.0.1, < 5.4.294linux_kernel >= 5.5, < 5.10.238linux_kernel >= 5.11, < 5.15.182linux_kernel >= 5.16, < 6.1.138linux_kernel >= 6.2, < 6.6.90linux_kernel >= 6.7, < 6.12.28linux_kernel >= 6.13, < 6.14.6linux_kernel = 5.0linux_kernel = 6.15Upgrade past the affected range:
linux_kernel 6.14.6Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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