CVE-2026-74662 (GCVE-0-2026-74662)
Vulnerability from cvelistv5
Published
2026-08-22 15:32
Modified
2026-08-27 12:39
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
inet: frags: publish queues before arming timer
inet_frag_create() arms the fragment queue timer before inserting the
queue into the fqdir rhashtable. If the namespace fragment timeout is
zero or negative, the timer can run before the queue is published.
The timer callback then marks the queue complete, tries to remove a node
that is not in the hash table yet, and drops the anticipated hash
reference. Creation can subsequently publish the completed queue without
restoring that reference, leaving a stale hash node after the caller drops
the remaining reference.
Publish the queue first and arm the timer while holding the queue lock.
This makes timer expiry wait until the queue is visible in the hash table,
so inet_frag_kill() can remove the node and balance the hash reference.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 648700f76b03b7e8149d13cc2bdb3355035258a9 Version: 648700f76b03b7e8149d13cc2bdb3355035258a9 Version: 648700f76b03b7e8149d13cc2bdb3355035258a9 Version: 648700f76b03b7e8149d13cc2bdb3355035258a9 Version: 648700f76b03b7e8149d13cc2bdb3355035258a9 Version: 648700f76b03b7e8149d13cc2bdb3355035258a9 Version: 648700f76b03b7e8149d13cc2bdb3355035258a9 Version: 648700f76b03b7e8149d13cc2bdb3355035258a9 Version: 493107105843f299662b3b664a83804645564f12 Version: 4.4.174 ≤ |
||
{
"containers": {
"cna": {
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{
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"product": "Linux",
"programFiles": [
"net/ipv4/inet_fragment.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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{
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},
{
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]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/ipv4/inet_fragment.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.17"
},
{
"lessThan": "4.17",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.267",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.218",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.185",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.154",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.106",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.45",
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},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.267",
"versionStartIncluding": "4.17",
"vulnerable": true
},
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{
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{
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{
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ninet: frags: publish queues before arming timer\n\ninet_frag_create() arms the fragment queue timer before inserting the\nqueue into the fqdir rhashtable. If the namespace fragment timeout is\nzero or negative, the timer can run before the queue is published.\n\nThe timer callback then marks the queue complete, tries to remove a node\nthat is not in the hash table yet, and drops the anticipated hash\nreference. Creation can subsequently publish the completed queue without\nrestoring that reference, leaving a stale hash node after the caller drops\nthe remaining reference.\n\nPublish the queue first and arm the timer while holding the queue lock.\nThis makes timer expiry wait until the queue is visible in the hash table,\nso inet_frag_kill() can remove the node and balance the hash reference."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - IPv4/IPv6 fragments reach inet_frag_create() via remote receive paths (ip_defrag, ipv6_frag_rcv, nf_conntrack reassembly) on any Internet-facing host performing normal fragment reassembly before transport delivery.\nAC:L - Requires per-netns fragment timeout \u22640 so the armed timer expires during queue creation; attacker-settable with CAP_NET_ADMIN in user/net namespaces, and the timer/hash race is fully attacker-controlled and repeatable via crafted fragments.\nPR:N - No authentication or capability check gates IPv4/IPv6 fragment receive/reassembly before inet_frag_find(); remote peers can deliver the triggering fragmented traffic pre-authentication to hosts processing fragments.\nUI:N - Exploitation needs only crafted fragmented packet delivery; no victim action such as opening files, clicking links, or mounting filesystems is required.\nS:U - Corruption is confined to the kernel network stack in the same security authority; this is standard kernel memory corruption/privilege escalation, not a VM escape or IOMMU boundary bypass.\nC:H - Incorrect refcounting leaves a stale rhashtable entry pointing at a freed inet_frag_queue; subsequent fragment lookups dereference freed slab memory, enabling kernel information disclosure primitives.\nI:H - Follow-on fragment handling on the stale queue writes through freed inet_frag_queue and skb linkage fields, yielding kernel heap corruption exploitable for arbitrary modification or code execution.\nA:H - Freed-queue dereferences during reassembly can kernel oops or panic; attackers can retrigger the condition repeatedly by sending additional fragmented datagrams matching the same fragment key."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-27T12:39:58.332Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/f4e4dab62181b7fe7c011bed6fbef9fc3d48c769"
},
{
"url": "https://git.kernel.org/stable/c/4ed0681dc2c1e0538b79d2fc56190ffcb369dacd"
},
{
"url": "https://git.kernel.org/stable/c/08a04d7bfb9c103432561aff8a62b6872e694a6a"
},
{
"url": "https://git.kernel.org/stable/c/d3ffb89b2944672cf7bdd8e9ee577d2043b4a956"
},
{
"url": "https://git.kernel.org/stable/c/39c6c4b267b65f00e0b0335a2ae00cbe9e3174f0"
},
{
"url": "https://git.kernel.org/stable/c/9f904dd3e455750e5d4ec9b2f134835811b85a2f"
},
{
"url": "https://git.kernel.org/stable/c/928128865e43b197e30688dc1bc991592c97edcf"
},
{
"url": "https://git.kernel.org/stable/c/653d7ddf6cba867777a3d14c4f83ace008c5ad13"
}
],
"title": "inet: frags: publish queues before arming timer",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74662",
"datePublished": "2026-08-22T15:32:35.151Z",
"dateReserved": "2026-08-15T05:44:03.924Z",
"dateUpdated": "2026-08-27T12:39:58.332Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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