net_sched: sch_sfq: fix a potential crash on gso_skb handling
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 &
CVE-2025-38115
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-38115
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
"lessThan": "c337efb20d6d9f9bbb4746f6b119917af5c886dc",
"versionType": "git"
},
{
"status": "affected",
"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
"lessThan": "b44f791f27b14c9eb6b907fbe51f2ba8bec32085",
"versionType": "git"
},
{
"status": "affected",
"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
"lessThan": "5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72",
"versionType": "git"
},
{
"status": "affected",
"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
"lessThan": "9c19498bdd7cb9d854bd3c54260f71cf7408495e",
"versionType": "git"
},
{
"status": "affected",
"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
"lessThan": "b4e9bab6011b9559b7c157b16b91ae46d4d8c533",
"versionType": "git"
},
{
"status": "affected",
"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
"lessThan": "d1bc80da75c789f2f6830df89d91fb2f7a509943",
"versionType": "git"
},
{
"status": "affected",
"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
"lessThan": "82448d4dcd8406dec688632a405fdcf7f170ec69",
"versionType": "git"
},
{
"status": "affected",
"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
"lessThan": "82ffbe7776d0ac084031f114167712269bf3d832",
"versionType": "git"
}
],
"programFiles": [
"net/sched/sch_sfq.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.295",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.239",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.186",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.142",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.94",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.34",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.15.3",
"versionType": "semver",
"lessThanOrEqual": "6.15.*"
},
{
"status": "unaffected",
"version": "6.16",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/sched/sch_sfq.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-38115
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30524 · Revision 1
- Added to Heist Feed
- Publisher date