CVE-2024-46800 (GCVE-0-2024-46800)
Vulnerability from cvelistv5 – Published: 2024-09-18 07:12 – Updated: 2026-08-05 11:38
VLAI
EPSS
VEX
Title
sch/netem: fix use after free in netem_dequeue
Summary
In the Linux kernel, the following vulnerability has been resolved:
sch/netem: fix use after free in netem_dequeue
If netem_dequeue() enqueues packet to inner qdisc and that qdisc
returns __NET_XMIT_STOLEN. The packet is dropped but
qdisc_tree_reduce_backlog() is not called to update the parent's
q.qlen, leading to the similar use-after-free as Commit
e04991a48dbaf382 ("netem: fix return value if duplicate enqueue
fails")
Commands to trigger KASAN UaF:
ip link add type dummy
ip link set lo up
ip link set dummy0 up
tc qdisc add dev lo parent root handle 1: drr
tc filter add dev lo parent 1: basic classid 1:1
tc class add dev lo classid 1:1 drr
tc qdisc add dev lo parent 1:1 handle 2: netem
tc qdisc add dev lo parent 2: handle 3: drr
tc filter add dev lo parent 3: basic classid 3:1 action mirred egress
redirect dev dummy0
tc class add dev lo classid 3:1 drr
ping -c1 -W0.01 localhost # Trigger bug
tc class del dev lo classid 1:1
tc class add dev lo classid 1:1 drr
ping -c1 -W0.01 localhost # UaF
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-29 14:21 UTC
Assigner
References
10 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
50612537e9ab29693122fab20fc1eed235054ffe , < f0bddb4de043399f16d1969dad5ee5b984a64e7b
(git)
Affected: 50612537e9ab29693122fab20fc1eed235054ffe , < 295ad5afd9efc5f67b86c64fce28fb94e26dc4c9 (git) Affected: 50612537e9ab29693122fab20fc1eed235054ffe , < 98c75d76187944296068d685dfd8a1e9fd8c4fdc (git) Affected: 50612537e9ab29693122fab20fc1eed235054ffe , < 14f91ab8d391f249b845916820a56f42cf747241 (git) Affected: 50612537e9ab29693122fab20fc1eed235054ffe , < db2c235682913a63054e741fe4e19645fdf2d68e (git) Affected: 50612537e9ab29693122fab20fc1eed235054ffe , < dde33a9d0b80aae0c69594d1f462515d7ff1cb3d (git) Affected: 50612537e9ab29693122fab20fc1eed235054ffe , < 32008ab989ddcff1a485fa2b4906234c25dc5cd6 (git) Affected: 50612537e9ab29693122fab20fc1eed235054ffe , < 3b3a2a9c6349e25a025d2330f479bc33a6ccb54a (git) |
guessed | |
| Linux | Linux |
Affected:
3.3
Unaffected: 0 , < 3.3 (semver) Unaffected: 4.19.322 , ≤ 4.19.* (semver) Unaffected: 5.4.284 , ≤ 5.4.* (semver) Unaffected: 5.10.226 , ≤ 5.10.* (semver) Unaffected: 5.15.167 , ≤ 5.15.* (semver) Unaffected: 6.1.110 , ≤ 6.1.* (semver) Unaffected: 6.6.51 , ≤ 6.6.* (semver) Unaffected: 6.10.10 , ≤ 6.10.* (semver) Unaffected: 6.11 , ≤ * (original_commit_for_fix) |
guessed |
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsch/netem: fix use after free in netem_dequeue\n\nIf netem_dequeue() enqueues packet to inner qdisc and that qdisc\nreturns __NET_XMIT_STOLEN. The packet is dropped but\nqdisc_tree_reduce_backlog() is not called to update the parent\u0027s\nq.qlen, leading to the similar use-after-free as Commit\ne04991a48dbaf382 (\"netem: fix return value if duplicate enqueue\nfails\")\n\nCommands to trigger KASAN UaF:\n\nip link add type dummy\nip link set lo up\nip link set dummy0 up\ntc qdisc add dev lo parent root handle 1: drr\ntc filter add dev lo parent 1: basic classid 1:1\ntc class add dev lo classid 1:1 drr\ntc qdisc add dev lo parent 1:1 handle 2: netem\ntc qdisc add dev lo parent 2: handle 3: drr\ntc filter add dev lo parent 3: basic classid 3:1 action mirred egress\nredirect dev dummy0\ntc class add dev lo classid 3:1 drr\nping -c1 -W0.01 localhost # Trigger bug\ntc class del dev lo classid 1:1\ntc class add dev lo classid 1:1 drr\nping -c1 -W0.01 localhost # UaF"
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sch/netem: se corrige el use after free en netem_dequeue si netem_dequeue() pone en cola el paquete en la qdisc interna y esa qdisc devuelve __NET_XMIT_STOLEN. El paquete se descarta pero no se llama a qdisc_tree_reduce_backlog() para actualizar el q.qlen del padre, lo que lleva a un use after free similar al Commit e04991a48dbaf382 (\"netem: corrige el valor de retorno si falla la puesta en cola duplicada\") Comandos para activar KASAN UaF: ip link add type dummy ip link set lo up ip link set dummy0 up tc qdisc add dev lo parent root handle 1: drr tc filter add dev lo parent 1: basic classid 1:1 tc class add dev lo classid 1:1 drr tc qdisc add dev lo parent 1:1 handle 2: netem tc qdisc add dev lo parent 2: handle 3: drr tc filter add dev lo parent 3: basic classid 3:1 action mirred egress redirect dev dummy0 tc class add dev lo classid 3:1 drr ping -c1 -W0.01 localhost # Desencadenador de error tc class del dev lo classid 1:1 tc class add dev lo classid 1:1 drr ping -c1 -W0.01 localhost # UaF"
}
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{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
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"vulnStatus": "Modified",
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"redhat_vex": {
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"current_release_date": "2026-08-04T17:58:34+00:00",
"cve": "CVE-2024-46800",
"id": "CVE-2024-46800",
"initial_release_date": "2024-09-18T00:00:00+00:00",
"product_status:fixed": "305",
"product_status:known_affected": "112",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: sch/netem: fix use after free in netem_dequeue",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-46800.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"providerMetadata": {
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"references": [
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},
{
"url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"
}
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"title": "CVE Program Container"
},
{
"metrics": [
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"id": "CVE-2024-46800",
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},
{
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],
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"timestamp": "2024-09-29T14:21:46.451136Z",
"version": "2.0.3"
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"dateUpdated": "2024-09-29T14:21:48.013Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
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"cna": {
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{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"version": "50612537e9ab29693122fab20fc1eed235054ffe",
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{
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"status": "unaffected",
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},
{
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}
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"value": "AV:L - Exploitation requires configuring a netem qdisc under a DRR class with a mirred-redirect filter via rtnetlink/tc, plus a locally transmitted packet to drive the dequeue path. Per kernel guidance, tc/netlink qdisc bugs are Local.\nAC:L - The commit message supplies a deterministic KASAN reproducer with no race and no dependence on conditions outside the attacker\u0027s control; the attacker fully controls the qdisc topology, the STOLEN-returning action, the class deletion, and the reclaiming heap spray.\nPR:L - Only CAP_NET_ADMIN scoped to a network namespace is needed, which any unprivileged local user obtains with `unshare -Urn`; this is also trivially reachable from containers/sandboxes that hold CAP_NET_ADMIN in their own netns.\nUI:N - The attacker performs every step \u2014 qdisc/class setup, the triggering transmit, the class deletion, and the second transmit that touches the freed object. No victim action is involved.\nS:U - The freed drr_class and the resulting corruption stay within the kernel\u0027s own security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The stale drr_class is dereferenced after free, and reclaiming the slab slot with sprayed data lets the attacker aim cl-\u003eqdisc at arbitrary kernel memory that is then read and dereferenced, yielding kernel memory disclosure.\nI:H - The UAF gives both an indirect call through cl-\u003eqdisc-\u003eops-\u003epeek and list_del_init()/list_move_tail() writes through attacker-controlled list pointers in the freed object \u2014 arbitrary write and control-flow hijack primitives leading to privilege escalation.\nA:H - Even without weaponization the use-after-free corrupts the DRR active list and oopses the kernel (confirmed by KASAN in the reporter\u0027s reproducer), crashing the system."
}
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}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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