GHSA-9GQR-9337-3JR8
Vulnerability from github – Published: 2025-07-03 09:30 – Updated: 2025-12-17 18:31In 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": [],
"aliases": [
"CVE-2025-38115"
],
"database_specific": {
"cwe_ids": [
"CWE-401"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-07-03T09:15:25Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: sch_sfq: fix a potential crash on gso_skb handling\n\nSFQ has an assumption of always being able to queue at least one packet.\n\nHowever, after the blamed commit, sch-\u003eq.len can be inflated by packets\nin sch-\u003egso_skb, and an enqueue() on an empty SFQ qdisc can be followed\nby an immediate drop.\n\nFix sfq_drop() to properly clear q-\u003etail in this situation.\n\n\nip netns add lb\nip link add dev to-lb type veth peer name in-lb netns lb\nethtool -K to-lb tso off # force qdisc to requeue gso_skb\nip netns exec lb ethtool -K in-lb gro on # enable NAPI\nip link set dev to-lb up\nip -netns lb link set dev in-lb up\nip addr add dev to-lb 192.168.20.1/24\nip -netns lb addr add dev in-lb 192.168.20.2/24\ntc qdisc replace dev to-lb root sfq limit 100\n\nip netns exec lb netserver\n\nnetperf -H 192.168.20.2 -l 100 \u0026\nnetperf -H 192.168.20.2 -l 100 \u0026\nnetperf -H 192.168.20.2 -l 100 \u0026\nnetperf -H 192.168.20.2 -l 100 \u0026",
"id": "GHSA-9gqr-9337-3jr8",
"modified": "2025-12-17T18:31:31Z",
"published": "2025-07-03T09:30:33Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38115"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/82448d4dcd8406dec688632a405fdcf7f170ec69"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/82ffbe7776d0ac084031f114167712269bf3d832"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9c19498bdd7cb9d854bd3c54260f71cf7408495e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b44f791f27b14c9eb6b907fbe51f2ba8bec32085"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b4e9bab6011b9559b7c157b16b91ae46d4d8c533"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c337efb20d6d9f9bbb4746f6b119917af5c886dc"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d1bc80da75c789f2f6830df89d91fb2f7a509943"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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