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vuln-cve/data/2025/37xxx/CVE-2025-37798.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-37798",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T04:51:23.941Z",
"datePublished": "2025-05-02T14:16:02.623Z",
"dateUpdated": "2026-10-15T21:51:59.989Z"
},
"containers": {
"cna": {
"providerMetadata": {
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"shortName": "Linux",
"dateUpdated": "2026-08-05T11:57:37.129Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncodel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()\n\nAfter making all ->qlen_notify() callbacks idempotent, now it is safe to\nremove the check of qlen!=0 from both fq_codel_dequeue() and\ncodel_qdisc_dequeue()."
}
],
"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 state is created and triggered through tc/rtnetlink qdisc configuration (RTM_NEWQDISC/RTM_NEWTCLASS/RTM_DELTCLASS) plus locally generated traffic over a loopback or veth device. There is no remote entry point into the qdisc class hierarchy setup.\nAC:L - The attacker controls every input: the qdisc hierarchy, CoDel's target/interval (unvalidated in codel_change()), the device MTU that defeats the backlog>mtu drop guard, the traffic that fills and empties the queue, and the moment the class is deleted. The inconsistent active-but-empty class state persists indefinitely, so no race window must be won.\nPR:L - Configuring qdiscs requires CAP_NET_ADMIN, but rtnetlink checks it via sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN), which any unprivileged local user obtains inside a `unshare -Urn` user+network namespace. Per kernel scoring guidance, tc/qdisc reachable through user namespaces is Low, not High.\nUI:N - The attacker performs every step — qdisc setup, traffic generation, and class deletion — within their own namespace. No victim action or interaction is needed.\nS:U - The corruption is confined to kernel heap objects and scheduler data structures managed by the same kernel security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed drr_class/qfq_class/hfsc_class remains linked in the parent's active list and rbtrees; after heap reclaim the attacker controls the object contents and the traversals read kernel pointers back out of it, yielding an arbitrary-read primitive and kernel address disclosure. Per guidance, use-after-free is High.\nI:H - Subsequent list_del/list_add and rb_erase operations write through pointers stored in the freed object, and drr_dequeue()/agg_dequeue() perform an indirect call via cl->qdisc->ops->peek() on reclaimed memory, giving a write primitive and control-flow hijack suitable for full privilege escalation.\nA:H - Even without successful exploitation, the dangling class in the active list/rbtree causes list and red-black-tree corruption and dereference of poisoned or freed pointers, producing a kernel oops or panic that can be triggered repeatedly by an unprivileged user."
}
]
}
],
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"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
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{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/sched/sch_codel.c",
"net/sched/sch_fq_codel.c"
],
"versions": [
{
"version": "3.5",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.5",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.4.297",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.241",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
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{
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"lessThanOrEqual": "5.15.*",
"status": "unaffected",
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{
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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{
"version": "6.15",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
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"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
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"url": "https://git.kernel.org/stable/c/7a742a9506849d1c1aa71e36c89855ceddc7d58e"
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{
"url": "https://git.kernel.org/stable/c/cc71a757da78dd4aa1b4a9b19cb011833730ccf2"
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"url": "https://git.kernel.org/stable/c/eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450"
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"url": "https://git.kernel.org/stable/c/4d55144b12e742404bb3f8fee6038bafbf45619d"
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{
"url": "https://git.kernel.org/stable/c/342debc12183b51773b3345ba267e9263bdfaaef"
}
],
"title": "codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()",
"x_generator": {
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},
"adp": [
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"title": "CVE Program Container",
"references": [
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"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
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{
"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
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"dateUpdated": "2025-11-03T19:55:29.865Z"
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"metrics": [
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"type": "ssvc",
"content": {
"id": "CVE-2025-37798",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"version": "2.0.3",
"timestamp": "2026-10-15T21:45:14.746981Z"
}
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"title": "CISA ADP Vulnrichment",
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}
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