CVE-2025-37992

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < ea1132ccb112f51ba749c56a912f67970c2cd542affected
LinuxLinux76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < d3336f746f196c6a53e0480923ae93939f047b6caffected
LinuxLinux76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < d38939ebe0d992d581acb6885c1723fa83c1fb2caffected
LinuxLinux76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < a7d6e0ac0a8861f6b1027488062251a8e28150fdaffected
LinuxLinux76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < d1365ca80b012d8a7863e45949e413fb61fa4861affected
LinuxLinux76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < fe88c7e4fc2c1cd75a278a15ffbf1689efad4e76affected
LinuxLinux76e3cc126bb223013a6b9a0e2a51238d1ef2e409 < 2d3cbfd6d54a2c39ce3244f33f85c595844bd7b8affected
LinuxLinux3.5affected
LinuxLinux0 < 3.5unaffected
LinuxLinux5.10.238 <= 5.10.*unaffected
LinuxLinux5.15.184 <= 5.15.*unaffected
LinuxLinux6.1.140 <= 6.1.*unaffected
LinuxLinux6.6.92 <= 6.6.*unaffected
LinuxLinux6.12.30 <= 6.12.*unaffected
LinuxLinux6.14.8 <= 6.14.*unaffected
LinuxLinux6.15 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References