CVE-2024-49936 (GCVE-0-2024-49936)
Vulnerability from cvelistv5 – Published: 2024-10-21 18:01 – Updated: 2026-08-05 11:40
VLAI
EPSS
VEX
Title
net/xen-netback: prevent UAF in xenvif_flush_hash()
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/xen-netback: prevent UAF in xenvif_flush_hash()
During the list_for_each_entry_rcu iteration call of xenvif_flush_hash,
kfree_rcu does not exist inside the rcu read critical section, so if
kfree_rcu is called when the rcu grace period ends during the iteration,
UAF occurs when accessing head->next after the entry becomes free.
Therefore, to solve this, you need to change it to list_for_each_entry_safe.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-22 13:38 UTC
Assigner
References
10 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
40d8abdee806d496a60ee607a6d01b1cd7fabaf0 , < 3c4423b0c4b98213b3438e15061e1d08220e6982
(git)
Affected: 40d8abdee806d496a60ee607a6d01b1cd7fabaf0 , < a7f0073fcd12ed7de185ef2c0af9d0fa1ddef22c (git) Affected: 40d8abdee806d496a60ee607a6d01b1cd7fabaf0 , < a0465723b8581cad27164c9073fd780904cd22d4 (git) Affected: 40d8abdee806d496a60ee607a6d01b1cd7fabaf0 , < efcff6ce7467f01f0753609f420333f3f2ceceda (git) Affected: 40d8abdee806d496a60ee607a6d01b1cd7fabaf0 , < 143edf098b80669d05245b2f2367dd156a83a2c5 (git) Affected: 40d8abdee806d496a60ee607a6d01b1cd7fabaf0 , < d408889d4b54f5501e4becc4dbbb9065143fbf4e (git) Affected: 40d8abdee806d496a60ee607a6d01b1cd7fabaf0 , < 54d8639af5568fc41c0e274fc3ec9cf86c59fcbb (git) Affected: 40d8abdee806d496a60ee607a6d01b1cd7fabaf0 , < 0fa5e94a1811d68fbffa0725efe6d4ca62c03d12 (git) |
guessed | |
| Linux | Linux |
Affected:
4.7
Unaffected: 0 , < 4.7 (semver) Unaffected: 5.4.290 , ≤ 5.4.* (semver) Unaffected: 5.10.227 , ≤ 5.10.* (semver) Unaffected: 5.15.168 , ≤ 5.15.* (semver) Unaffected: 6.1.113 , ≤ 6.1.* (semver) Unaffected: 6.6.55 , ≤ 6.6.* (semver) Unaffected: 6.10.14 , ≤ 6.10.* (semver) Unaffected: 6.11.3 , ≤ 6.11.* (semver) Unaffected: 6.12 , ≤ * (original_commit_for_fix) |
guessed |
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"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
}
],
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{
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"options": [
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},
{
"automatable": "no"
},
{
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}
],
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"timestamp": "2024-10-22T13:38:23.774447Z",
"version": "2.0.3"
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}
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},
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},
{
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"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
},
{
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],
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},
"redhat_vex": {
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"current_release_date": "2026-09-13T15:42:34+00:00",
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"id": "CVE-2024-49936",
"initial_release_date": "2024-10-21T00:00:00+00:00",
"product_status:known_not_affected": "198",
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"title": "kernel: net/xen-netback: prevent UAF in xenvif_flush_hash()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-49936.json",
"version": "3"
},
"vulnrichment": {
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],
"title": "CVE Program Container"
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"metrics": [
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},
{
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},
{
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}
],
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"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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"product": "Linux",
"programFiles": [
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],
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},
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}
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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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