CVE-2025-37913
Description
In the Linux kernel, the following vulnerability has been resolved: net_sched: qfq: 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 qfq, there won't be a UAF, but the code will add the same classifier to the list twice, which will cause memory corruption. This patch checks whether the class was already added to the agg->active list (cl_is_active) before doing the addition to cater for the reentrant case. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/
How to fix
- linux linux_kernel5.4.294, 5.10.238, 5.15.182, 6.1.138, 6.6.90, 6.12.28, 6.14.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.0.1 ≤ v < 5.4.294, 5.5 ≤ v < 5.10.238, 5.11 ≤ v < 5.15.182, 5.16 ≤ v < 6.1.138, 6.2 ≤ v < 6.6.90, 6.7 ≤ v < 6.12.28, 6.13 ≤ v < 6.14.6, 5.0, 6.15 | 5.4.294, 5.10.238, 5.15.182, 6.1.138, 6.6.90, 6.12.28, 6.14.6 |
| debian debian_linux | 11.0 | — |
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