CVE-2026-74669 (GCVE-0-2026-74669)
Vulnerability from cvelistv5
Published
2026-08-22 15:32
Modified
2026-08-25 05:41
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
ipvs: clear IPv4 options after rebasing tunnel ICMP errors
ip_vs_in_icmp() rebases an skb from the outer ICMP packet to the
quoted original request before passing it to icmp_send(). However,
IPCB(skb)->opt still describes the outer IPv4 header.
A timestamp option in the outer header can therefore leave an offset
that points into the quoted transport header after the rebase.
__ip_options_echo() treats a byte at that stale location as the option
length and copies it into the fixed-size option storage on the
__icmp_send() stack, causing a stack out-of-bounds write.
Clear the stale option metadata after resetting the network header.
Keep the remaining control block fields, including the ingress
interface used by the ICMP response path.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e Version: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e Version: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e Version: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e Version: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e Version: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e Version: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e Version: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/netfilter/ipvs/ip_vs_core.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"status": "affected",
"version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e",
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},
{
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"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.7"
},
{
"lessThan": "3.7",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.152",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver"
},
{
"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": "5.10.265",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
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{
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{
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"vulnerable": true
},
{
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"versionStartIncluding": "3.7",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: clear IPv4 options after rebasing tunnel ICMP errors\n\nip_vs_in_icmp() rebases an skb from the outer ICMP packet to the\nquoted original request before passing it to icmp_send(). However,\nIPCB(skb)-\u003eopt still describes the outer IPv4 header.\n\nA timestamp option in the outer header can therefore leave an offset\nthat points into the quoted transport header after the rebase.\n__ip_options_echo() treats a byte at that stale location as the option\nlength and copies it into the fixed-size option storage on the\n__icmp_send() stack, causing a stack out-of-bounds write.\n\nClear the stale option metadata after resetting the network header.\nKeep the remaining control block fields, including the ingress\ninterface used by the ICMP response path."
}
],
"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 - The bug is hit when a remote peer sends a crafted ICMP error to an IPVS load balancer; processing occurs in the IPv4 LOCAL_IN/FORWARD netfilter path on received network packets before icmp_send().\nAC:L - An attacker can reliably trigger the path by opening IPVS tunnel traffic, then sending an ICMP error whose outer IPv4 header includes a timestamp option and whose quoted payload aligns bytes at the stale option offset to a large length.\nPR:N - Exploitation requires only the ability to send IPv4/ICMP to the target; the remote attacker needs no local account, capability, or authentication on the victim host.\nUI:N - No victim user action is required beyond normal exposure of an IPVS tunnel load balancer to the network; exploitation is driven entirely by attacker-sent packets.\nS:U - Impact is confined to kernel memory/stack corruption and privilege boundaries within the host kernel; it does not cross into another security authority such as a VM guest or separate sandbox domain.\nC:H - The stale IPCB option metadata drives __ip_options_echo() to memcpy() from attacker-influenced skb bytes into a 40-byte stack buffer, enabling out-of-bounds kernel memory access that can disclose stack/kernel data.\nI:H - The stack out-of-bounds write in __icmp_send() is attacker-controlled in length and content via crafted quoted headers, providing a standard memory-corruption primitive that can corrupt return addresses and enable arbitrary kernel code execution.\nA:H - Corrupting the __icmp_send() stack frame can immediately panic or oops the kernel during ICMP processing, causing complete loss of availability on the load balancer."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-25T05:41:24.114Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/79ffa99202c944467e28b13b513bf2998732edff"
},
{
"url": "https://git.kernel.org/stable/c/c9413b50204738fbc429bb86bf01353c393a6c28"
},
{
"url": "https://git.kernel.org/stable/c/37c61b3745129cbd682c557b51345828120972e5"
},
{
"url": "https://git.kernel.org/stable/c/ed246dd85ebf27c1f6b7897834d40786c0ca3006"
},
{
"url": "https://git.kernel.org/stable/c/6f46fc460e9316062bdcdf89199eb5d7a33da33b"
},
{
"url": "https://git.kernel.org/stable/c/75eec935444db4af2123e0491936f6e273d7ea00"
},
{
"url": "https://git.kernel.org/stable/c/384b4dae14277d369221d187e9b3af56c79d2e50"
},
{
"url": "https://git.kernel.org/stable/c/e0ba936287dfe9783426aac27e5fd76fe35b38c9"
}
],
"title": "ipvs: clear IPv4 options after rebasing tunnel ICMP errors",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74669",
"datePublished": "2026-08-22T15:32:40.221Z",
"dateReserved": "2026-08-15T05:44:03.924Z",
"dateUpdated": "2026-08-25T05:41:24.114Z",
"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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