HighFix available
net/xen-netback: prevent UAF in xenvif_flush_hash()
Type: advisorySources: OSV
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.227, 5.15.168, 5.4.290, 6.1.113, 6.10.14, 6.11.3, 6.6.55
- CVEs
- CVE-2024-49936
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 03:15 UTC · Revision 1
Source evidence
net/xen-netback: prevent UAF in xenvif_flush_hash()
core-osv · Original sourcePublished 21 Oct 2024, 18:01 UTC
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.
osv:CVE-2024-49936
Kernel
Fixed versions: 5.4.290, 5.10.227, 5.15.168, 6.1.113, 6.6.55, 6.10.14, 6.11.3
Complete source record
{
"id": "02cee15a6c8664d8756481a1e8877a91db8134219a68eecb5ecd4db5530ae999",
"url": "https://osv.dev/vulnerability/CVE-2024-49936",
"method": "structured",
"payload": {
"kind": "advisory",
"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.",
"evidence": "osv:CVE-2024-49936",
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{
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"modified": "2026-10-28T02:30:42.157384475Z",
"provider": "osv",
"references": [
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"https://git.kernel.org/stable/c/143edf098b80669d05245b2f2367dd156a83a2c5",
"https://git.kernel.org/stable/c/3c4423b0c4b98213b3438e15061e1d08220e6982",
"https://git.kernel.org/stable/c/54d8639af5568fc41c0e274fc3ec9cf86c59fcbb",
"https://git.kernel.org/stable/c/a0465723b8581cad27164c9073fd780904cd22d4",
"https://git.kernel.org/stable/c/a7f0073fcd12ed7de185ef2c0af9d0fa1ddef22c",
"https://git.kernel.org/stable/c/d408889d4b54f5501e4becc4dbbb9065143fbf4e",
"https://git.kernel.org/stable/c/efcff6ce7467f01f0753609f420333f3f2ceceda",
"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49936.json",
"https://nvd.nist.gov/vuln/detail/CVE-2024-49936",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/49xxx/CVE-2024-49936.json"
}
},
"related_cves": [
{
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"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 509765,
"published_at": "2024-10-21T18:01:57.066+00:00"
}