CVE-2025-37992
Description
In the Linux kernel, the following vulnerability has been resolved: net_sched: Flush gso_skb list too during ->change() Previously, when reducing a qdisc's limit via the ->change() operation, only the main skb queue was trimmed, potentially leaving packets in the gso_skb list. This could result in NULL pointer dereference when we only check sch->limit against sch->q.qlen. This patch introduces a new helper, qdisc_dequeue_internal(), which ensures both the gso_skb list and the main queue are properly flushed when trimming excess packets. All relevant qdiscs (codel, fq, fq_codel, fq_pie, hhf, pie) are updated to use this helper in their ->change() routines.
How to fix
- linux linux_kernel5.10.238, 5.15.184, 6.1.140, 6.6.92, 6.12.30, 6.14.8 or later
- git.kernel.org/stable/c/2d3cbfd6d54a2c39ce3244f33f85c595844bd7b8
- git.kernel.org/stable/c/a7d6e0ac0a8861f6b1027488062251a8e28150fd
- git.kernel.org/stable/c/d1365ca80b012d8a7863e45949e413fb61fa4861
- git.kernel.org/stable/c/d3336f746f196c6a53e0480923ae93939f047b6c
- git.kernel.org/stable/c/d38939ebe0d992d581acb6885c1723fa83c1fb2c
- git.kernel.org/stable/c/ea1132ccb112f51ba749c56a912f67970c2cd542
- git.kernel.org/stable/c/fe88c7e4fc2c1cd75a278a15ffbf1689efad4e76
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 3.5 ≤ v < 5.10.238, 5.11 ≤ v < 5.15.184, 5.16 ≤ v < 6.1.140, 6.2 ≤ v < 6.6.92, 6.7 ≤ v < 6.12.30, 6.13 ≤ v < 6.14.8, 6.15 | 5.10.238, 5.15.184, 6.1.140, 6.6.92, 6.12.30, 6.14.8 |
| debian debian_linux | 11.0 | — |
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