CVE-2024-45016 (GCVE-0-2024-45016)
Vulnerability from cvelistv5 – Published: 2024-09-11 15:13 – Updated: 2026-08-05 11:37
VLAI
EPSS
VEX
Title
netem: fix return value if duplicate enqueue fails
Summary
In the Linux kernel, the following vulnerability has been resolved:
netem: fix return value if duplicate enqueue fails
There is a bug in netem_enqueue() introduced by
commit 5845f706388a ("net: netem: fix skb length BUG_ON in __skb_to_sgvec")
that can lead to a use-after-free.
This commit made netem_enqueue() always return NET_XMIT_SUCCESS
when a packet is duplicated, which can cause the parent qdisc's q.qlen
to be mistakenly incremented. When this happens qlen_notify() may be
skipped on the parent during destruction, leaving a dangling pointer
for some classful qdiscs like DRR.
There are two ways for the bug happen:
- If the duplicated packet is dropped by rootq->enqueue() and then
the original packet is also dropped.
- If rootq->enqueue() sends the duplicated packet to a different qdisc
and the original packet is dropped.
In both cases NET_XMIT_SUCCESS is returned even though no packets
are enqueued at the netem qdisc.
The fix is to defer the enqueue of the duplicate packet until after
the original packet has been guaranteed to return NET_XMIT_SUCCESS.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
10 references
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
5845f706388a4cde0f6b80f9e5d33527e942b7d9 , < 759e3e8c4a6a6b4e52ebc4547123a457f0ce90d4
(git)
Affected: 5845f706388a4cde0f6b80f9e5d33527e942b7d9 , < c414000da1c2ea1ba9a5e5bb1a4ba774e51e202d (git) Affected: 5845f706388a4cde0f6b80f9e5d33527e942b7d9 , < 52d99a69f3d556c6426048c9d481b912205919d8 (git) Affected: 5845f706388a4cde0f6b80f9e5d33527e942b7d9 , < 0486d31dd8198e22b63a4730244b38fffce6d469 (git) Affected: 5845f706388a4cde0f6b80f9e5d33527e942b7d9 , < 577d6c0619467fe90f7e8e57e45cb5bd9d936014 (git) Affected: 5845f706388a4cde0f6b80f9e5d33527e942b7d9 , < e5bb2988a310667abed66c7d3ffa28880cf0f883 (git) Affected: 5845f706388a4cde0f6b80f9e5d33527e942b7d9 , < c07ff8592d57ed258afee5a5e04991a48dbaf382 (git) Affected: a550a01b8af856f2684b0f79d552f5119eb5006c (git) Affected: 009510a90e230bb495f3fe25c7db956679263b07 (git) Affected: 4de7d30668cb8b06330992e1cd336f91700a2ce7 (git) Affected: d1dd2e15c85e890a1cc9bde5ba07ae63331e5c73 (git) Affected: 0148fe458b5705e2fea7cb88294fed7e36066ca2 (git) Affected: 3.16.66 , < 3.17 (semver) Affected: 4.9.163 , < 4.10 (semver) Affected: 4.14.106 , < 4.15 (semver) Affected: 4.19.28 , < 4.20 (semver) Affected: 4.20.15 , < 4.21 (semver) |
|
| Linux | Linux |
Affected:
5.0
Unaffected: 0 , < 5.0 (semver) Unaffected: 5.4.283 , ≤ 5.4.* (semver) Unaffected: 5.10.225 , ≤ 5.10.* (semver) Unaffected: 5.15.166 , ≤ 5.15.* (semver) Unaffected: 6.1.107 , ≤ 6.1.* (semver) Unaffected: 6.6.48 , ≤ 6.6.* (semver) Unaffected: 6.10.7 , ≤ 6.10.* (semver) Unaffected: 6.11 , ≤ * (original_commit_for_fix) |
|
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem |
Affected:
0 , < *
(custom)
|
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"id": "CVE-2024-45016",
"lastModified": "2024-09-13T16:36:06.773",
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"published": "2024-09-11T16:15:06.817",
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"current_release_date": "2026-02-21T00:59:29.000Z",
"cve": "CVE-2024-45016",
"id": "msrc_CVE-2024-45016",
"initial_release_date": "2024-09-01T07:00:00.000Z",
"product_status:fixed": "5",
"product_status:known_affected": "5",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "netem: fix return value if duplicate enqueue fails",
"url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-45016.json",
"version": "3"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2024-45016\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-09-11T16:15:06.817\",\"lastModified\":\"2026-08-04T11:20:10.467\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetem: fix return value if duplicate enqueue fails\\n\\nThere is a bug in netem_enqueue() introduced by\\ncommit 5845f706388a (\\\"net: netem: fix skb length BUG_ON in __skb_to_sgvec\\\")\\nthat can lead to a use-after-free.\\n\\nThis commit made netem_enqueue() always return NET_XMIT_SUCCESS\\nwhen a packet is duplicated, which can cause the parent qdisc\u0027s q.qlen\\nto be mistakenly incremented. When this happens qlen_notify() may be\\nskipped on the parent during destruction, leaving a dangling pointer\\nfor some classful qdiscs like DRR.\\n\\nThere are two ways for the bug happen:\\n\\n- If the duplicated packet is dropped by rootq-\u003eenqueue() and then\\n the original packet is also dropped.\\n- If rootq-\u003eenqueue() sends the duplicated packet to a different qdisc\\n and the original packet is dropped.\\n\\nIn both cases NET_XMIT_SUCCESS is returned even though no packets\\nare enqueued at the netem qdisc.\\n\\nThe fix is to defer the enqueue of the duplicate packet until after\\nthe original packet has been guaranteed to return NET_XMIT_SUCCESS.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netem: corregir valor de retorno si falla la puesta en cola duplicada Hay un error en netem_enqueue() introducido por el commit 5845f706388a (\\\"net: netem: corregir BUG_ON de longitud de skb en __skb_to_sgvec\\\") que puede provocar un use-after-free. Esta confirmaci\u00f3n hizo que netem_enqueue() siempre devolviera NET_XMIT_SUCCESS cuando se duplica un paquete, lo que puede provocar que el q.qlen de la qdisc padre se incremente por error. Cuando esto sucede, es posible que qlen_notify() se omita en el padre durante la destrucci\u00f3n, dejando un puntero colgante para algunas qdisc con clase como DRR. Hay dos formas en las que ocurre el error: - Si el paquete duplicado se descarta mediante rootq-\u0026gt;enqueue() y luego tambi\u00e9n se descarta el paquete original. - Si rootq-\u0026gt;enqueue() env\u00eda el paquete duplicado a una qdisc diferente y se descarta el paquete original, en ambos casos se devuelve NET_XMIT_SUCCESS aunque no haya paquetes en cola en la qdisc netem. 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"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: netem: fix return value if duplicate enqueue fails",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-45016.json",
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\"a550a01b8af856f2684b0f79d552f5119eb5006c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"009510a90e230bb495f3fe25c7db956679263b07\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4de7d30668cb8b06330992e1cd336f91700a2ce7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d1dd2e15c85e890a1cc9bde5ba07ae63331e5c73\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0148fe458b5705e2fea7cb88294fed7e36066ca2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3.16.66\", \"lessThan\": \"3.17\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.9.163\", \"lessThan\": \"4.10\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.14.106\", \"lessThan\": \"4.15\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.19.28\", \"lessThan\": \"4.20\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.20.15\", \"lessThan\": \"4.21\", \"versionType\": \"semver\"}], \"programFiles\": [\"net/sched/sch_netem.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.0\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.0\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.283\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.225\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.166\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.107\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.48\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/sched/sch_netem.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/759e3e8c4a6a6b4e52ebc4547123a457f0ce90d4\"}, {\"url\": \"https://git.kernel.org/stable/c/c414000da1c2ea1ba9a5e5bb1a4ba774e51e202d\"}, {\"url\": \"https://git.kernel.org/stable/c/52d99a69f3d556c6426048c9d481b912205919d8\"}, {\"url\": \"https://git.kernel.org/stable/c/0486d31dd8198e22b63a4730244b38fffce6d469\"}, {\"url\": \"https://git.kernel.org/stable/c/577d6c0619467fe90f7e8e57e45cb5bd9d936014\"}, {\"url\": \"https://git.kernel.org/stable/c/e5bb2988a310667abed66c7d3ffa28880cf0f883\"}, {\"url\": \"https://git.kernel.org/stable/c/c07ff8592d57ed258afee5a5e04991a48dbaf382\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetem: fix return value if duplicate enqueue fails\\n\\nThere is a bug in netem_enqueue() introduced by\\ncommit 5845f706388a (\\\"net: netem: fix skb length BUG_ON in __skb_to_sgvec\\\")\\nthat can lead to a use-after-free.\\n\\nThis commit made netem_enqueue() always return NET_XMIT_SUCCESS\\nwhen a packet is duplicated, which can cause the parent qdisc\u0027s q.qlen\\nto be mistakenly incremented. When this happens qlen_notify() may be\\nskipped on the parent during destruction, leaving a dangling pointer\\nfor some classful qdiscs like DRR.\\n\\nThere are two ways for the bug happen:\\n\\n- If the duplicated packet is dropped by rootq-\u003eenqueue() and then\\n the original packet is also dropped.\\n- If rootq-\u003eenqueue() sends the duplicated packet to a different qdisc\\n and the original packet is dropped.\\n\\nIn both cases NET_XMIT_SUCCESS is returned even though no packets\\nare enqueued at the netem qdisc.\\n\\nThe fix is to defer the enqueue of the duplicate packet until after\\nthe original packet has been guaranteed to return NET_XMIT_SUCCESS.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.283\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.225\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.166\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.107\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.48\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.7\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.16.66\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.9.163\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.14.106\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.19.28\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.20.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:53:18.767Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2024-45016\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:53:18.767Z\", \"dateReserved\": \"2024-08-21T05:34:56.682Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-09-11T15:13:52.053Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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.
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