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vuln-cve/data/2025/38xxx/CVE-2025-38115.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-38115",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T04:51:23.986Z",
"datePublished": "2025-07-03T08:35:23.750Z",
"dateUpdated": "2026-10-15T21:52:08.900Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T11:59:39.505Z"
},
"descriptions": [
{
"lang": "en",
"value": "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->q.len can be inflated by packets\nin sch->gso_skb, and an enqueue() on an empty SFQ qdisc can be followed\nby an immediate drop.\n\nFix sfq_drop() to properly clear q->tail 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 &\nnetperf -H 192.168.20.2 -l 100 &\nnetperf -H 192.168.20.2 -l 100 &\nnetperf -H 192.168.20.2 -l 100 &"
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerable code is the SFQ qdisc, reached by configuring a qdisc via tc/netlink on a local netdevice and then driving local transmit traffic through it; there is no path for an unauthenticated remote peer to install the qdisc or control the requeue/limit conditions. Per kernel scoring convention, tc/qdisc netlink-configured subsystems are Local.\nAC:L - The attacker controls every precondition — SFQ limit, the veth/NAPI setup that forces NETDEV_TX_BUSY requeues into gso_skb, the number of flows, and the traffic rate — so the \"empty SFQ + inflated q.qlen + single-slot drop\" state is reached deterministically, as demonstrated by the upstream reproducer. No race window or uncontrollable memory layout is required.\nPR:L - Creating the veth pair and installing the SFQ qdisc requires only CAP_NET_ADMIN within a network namespace, which any unprivileged local user obtains via `unshare -Urn`; no real root in the init namespace is needed. Basic local user access is therefore sufficient.\nUI:N - The attacker sets up the qdisc and generates the traffic entirely on their own; no victim action, mount, or file open is involved.\nS:U - The corruption occurs in kernel memory and the resulting compromise stays within the same security authority (kernel/host); no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - The stale q->tail leads to slot->qlen underflowing to 65535, causing sfq_link() to read q->dep[65535] roughly 256 KB out of bounds, and the emptied slot is returned as a fake sk_buff whose contents are read as skb->len/skb->data/GSO fields by the transmit path — both yield disclosure of adjacent kernel memory and, via heap grooming, arbitrary read.\nI:H - sfq_link() performs out-of-bounds writes (`q->dep[65535].next = x` and `sfq_dep_head(q, n)->prev = x` with n taken from out-of-bounds memory), and the type-confused sfq_slot is ultimately freed into skbuff_head_cache — an OOB write plus wild free that is leverageable for control-flow hijack and privilege escalation.\nA:H - Dequeuing from the stale empty slot reliably produces a bogus sk_buff handed to the device driver plus out-of-bounds accesses, causing kernel oops/panic (the reported symptom is a crash), and the condition can be re-triggered at will."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/sched/sch_sfq.c"
],
"versions": [
{
"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
"lessThan": "c337efb20d6d9f9bbb4746f6b119917af5c886dc",
"status": "affected",
"versionType": "git"
},
{
"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
"lessThan": "b44f791f27b14c9eb6b907fbe51f2ba8bec32085",
"status": "affected",
"versionType": "git"
},
{
"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
"lessThan": "5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72",
"status": "affected",
"versionType": "git"
},
{
"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
"lessThan": "9c19498bdd7cb9d854bd3c54260f71cf7408495e",
"status": "affected",
"versionType": "git"
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{
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"lessThan": "b4e9bab6011b9559b7c157b16b91ae46d4d8c533",
"status": "affected",
"versionType": "git"
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{
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"lessThan": "d1bc80da75c789f2f6830df89d91fb2f7a509943",
"status": "affected",
"versionType": "git"
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{
"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
"lessThan": "82448d4dcd8406dec688632a405fdcf7f170ec69",
"status": "affected",
"versionType": "git"
},
{
"version": "a53851e2c3218aa30b77abd6e68cf1c371f15afe",
"lessThan": "82ffbe7776d0ac084031f114167712269bf3d832",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/sched/sch_sfq.c"
],
"versions": [
{
"version": "4.16",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.16",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.4.295",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.239",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.186",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.142",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.94",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.34",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.15.3",
"lessThanOrEqual": "6.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.16",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "5.4.295"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "5.10.239"
},
{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "6.6.94"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "6.12.34"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "6.15.3"
},
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"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.16",
"versionEndExcluding": "6.16"
}
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],
"references": [
{
"url": "https://git.kernel.org/stable/c/c337efb20d6d9f9bbb4746f6b119917af5c886dc"
},
{
"url": "https://git.kernel.org/stable/c/b44f791f27b14c9eb6b907fbe51f2ba8bec32085"
},
{
"url": "https://git.kernel.org/stable/c/5814a7fc3abb41f63f2d44c9d3ff9d4e62965b72"
},
{
"url": "https://git.kernel.org/stable/c/9c19498bdd7cb9d854bd3c54260f71cf7408495e"
},
{
"url": "https://git.kernel.org/stable/c/b4e9bab6011b9559b7c157b16b91ae46d4d8c533"
},
{
"url": "https://git.kernel.org/stable/c/d1bc80da75c789f2f6830df89d91fb2f7a509943"
},
{
"url": "https://git.kernel.org/stable/c/82448d4dcd8406dec688632a405fdcf7f170ec69"
},
{
"url": "https://git.kernel.org/stable/c/82ffbe7776d0ac084031f114167712269bf3d832"
}
],
"title": "net_sched: sch_sfq: fix a potential crash on gso_skb handling",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"title": "CVE Program Container",
"references": [
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
},
{
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
}
],
"providerMetadata": {
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE",
"dateUpdated": "2025-11-03T17:34:18.395Z"
}
},
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2025-38115",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"version": "2.0.3",
"timestamp": "2026-10-15T21:47:38.082535Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-10-15T21:52:08.900Z"
}
}
]
}
}
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