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THREATINT
PUBLISHED

CVE-2025-38115

net_sched: sch_sfq: fix a potential crash on gso_skb handling



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 &

Reserved 2025-04-16 | Published 2025-07-03 | Updated 2025-07-03 | Assigner Linux

Product status

Default status
unaffected

a53851e2c3218aa30b77abd6e68cf1c371f15afe before c337efb20d6d9f9bbb4746f6b119917af5c886dc
affected

a53851e2c3218aa30b77abd6e68cf1c371f15afe before b44f791f27b14c9eb6b907fbe51f2ba8bec32085
affected

a53851e2c3218aa30b77abd6e68cf1c371f15afe before 5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72
affected

a53851e2c3218aa30b77abd6e68cf1c371f15afe before 9c19498bdd7cb9d854bd3c54260f71cf7408495e
affected

a53851e2c3218aa30b77abd6e68cf1c371f15afe before b4e9bab6011b9559b7c157b16b91ae46d4d8c533
affected

a53851e2c3218aa30b77abd6e68cf1c371f15afe before d1bc80da75c789f2f6830df89d91fb2f7a509943
affected

a53851e2c3218aa30b77abd6e68cf1c371f15afe before 82448d4dcd8406dec688632a405fdcf7f170ec69
affected

a53851e2c3218aa30b77abd6e68cf1c371f15afe before 82ffbe7776d0ac084031f114167712269bf3d832
affected

Default status
affected

4.16
affected

Any version before 4.16
unaffected

5.4.295
unaffected

5.10.239
unaffected

5.15.186
unaffected

6.1.142
unaffected

6.6.94
unaffected

6.12.34
unaffected

6.15.3
unaffected

6.16-rc2
unaffected

References

git.kernel.org/...c/c337efb20d6d9f9bbb4746f6b119917af5c886dc

git.kernel.org/...c/b44f791f27b14c9eb6b907fbe51f2ba8bec32085

git.kernel.org/...c/5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72

git.kernel.org/...c/9c19498bdd7cb9d854bd3c54260f71cf7408495e

git.kernel.org/...c/b4e9bab6011b9559b7c157b16b91ae46d4d8c533

git.kernel.org/...c/d1bc80da75c789f2f6830df89d91fb2f7a509943

git.kernel.org/...c/82448d4dcd8406dec688632a405fdcf7f170ec69

git.kernel.org/...c/82ffbe7776d0ac084031f114167712269bf3d832

cve.org (CVE-2025-38115)

nvd.nist.gov (CVE-2025-38115)

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