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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2025-38115

net_sched: sch_sfq: fix a potential crash on gso_skb handling

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: net_sched: sch_sfq: fix a potential crash on gso_skb handling SFQ has an assumption of always being able to queue at least one packet. However, after the blamed commit, sch->q.len can be inflated by packets in sch->gso_skb, and an enqueue() on an empty SFQ qdisc can be followed by an immediate drop. Fix sfq_drop() to properly clear q->tail in this situation. ip netns add lb ip link add dev to-lb type veth peer name in-lb netns lb ethtool -K to-lb tso off # force qdisc to requeue gso_skb ip netns exec lb ethtool -K in-lb gro on # enable NAPI ip link set dev to-lb up ip -netns lb link set dev in-lb up ip addr add dev to-lb 192.168.20.1/24 ip -netns lb addr add dev in-lb 192.168.20.2/24 tc qdisc replace dev to-lb root sfq limit 100 ip netns exec lb netserver netperf -H 192.168.20.2 -l 100 & netperf -H 192.168.20.2 -l 100 & netperf -H 192.168.20.2 -l 100 & netperf -H 192.168.20.2 -l 100 &

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • a53851e2c3218aa30b77abd6e68cf1c371f15afe to < c337efb20d6d9f9bbb4746f6b119917af5c886dcaffected
  • a53851e2c3218aa30b77abd6e68cf1c371f15afe to < b44f791f27b14c9eb6b907fbe51f2ba8bec32085affected
  • a53851e2c3218aa30b77abd6e68cf1c371f15afe to < 5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72affected
  • a53851e2c3218aa30b77abd6e68cf1c371f15afe to < 9c19498bdd7cb9d854bd3c54260f71cf7408495eaffected
  • a53851e2c3218aa30b77abd6e68cf1c371f15afe to < b4e9bab6011b9559b7c157b16b91ae46d4d8c533affected
  • a53851e2c3218aa30b77abd6e68cf1c371f15afe to < d1bc80da75c789f2f6830df89d91fb2f7a509943affected
  • a53851e2c3218aa30b77abd6e68cf1c371f15afe to < 82448d4dcd8406dec688632a405fdcf7f170ec69affected
  • a53851e2c3218aa30b77abd6e68cf1c371f15afe to < 82ffbe7776d0ac084031f114167712269bf3d832affected

Linux Linux

Default version status: affected

  • 4.16affected
  • 0 to < 4.16unaffected
  • 5.4.295 to ≤ 5.4.*unaffected
  • 5.10.239 to ≤ 5.10.*unaffected
  • 5.15.186 to ≤ 5.15.*unaffected
  • 6.1.142 to ≤ 6.1.*unaffected
  • 6.6.94 to ≤ 6.6.*unaffected
  • 6.12.34 to ≤ 6.12.*unaffected
  • 6.15.3 to ≤ 6.15.*unaffected
  • 6.16 to ≤ *unaffected

References