CVE-2026-74724 (GCVE-0-2026-74724)
Vulnerability from cvelistv5 – Published: 2026-08-22 15:33 – Updated: 2026-08-25 05:42
VLAI
EPSS
VEX
Title
ipvs: avoid out-of-bounds write in ip_vs_nat_icmp
Summary
In the Linux kernel, the following vulnerability has been resolved:
ipvs: avoid out-of-bounds write in ip_vs_nat_icmp
Sashiko warns that local attacker can modify the packet
while it is processed by IPVS. Some places read the
IP ihl field multiple times which can cause out-of-bounds
access. One such place is ip_vs_nat_icmp where we
can write after the validated area.
Fix it by providing ciph argument just like it is done for
IPv6 and use ciph->len as offset to the embedded transport
header.
Modify some IPv4 header checks by reading the ihl field
only once.
Severity
7.8 (High)
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3b8f79af0e98f27b932b0b416e9c52b692d31ff9
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3c779b258c9c3c3567af68d4f45c2f751f35bd0e (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < be65fa324640c7a95e30b146159a2be5cc73f22e (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a69a4b3fff5814d079beff9a1e9d369994b2ed47 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 243d0187ec4c3837b9b0004f18d1068e46115760 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 646922a0379496154e8c8faca4f8e2fd9100cacc (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.12
Unaffected: 0 , < 2.6.12 (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.152 , ≤ 6.6.* (semver) Unaffected: 6.12.104 , ≤ 6.12.* (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
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"product": "Linux",
"programFiles": [
"include/net/ip_vs.h",
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"net/netfilter/ipvs/ip_vs_xmit.c"
],
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"vendor": "Linux",
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.6.152",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.104",
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},
{
"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:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.12",
"vulnerable": true
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},
{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
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"versionEndExcluding": "7.2",
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"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: avoid out-of-bounds write in ip_vs_nat_icmp\n\nSashiko warns that local attacker can modify the packet\nwhile it is processed by IPVS. Some places read the\nIP ihl field multiple times which can cause out-of-bounds\naccess. One such place is ip_vs_nat_icmp where we\ncan write after the validated area.\n\nFix it by providing ciph argument just like it is done for\nIPv6 and use ciph-\u003elen as offset to the embedded transport\nheader.\n\nModify some IPv4 header checks by reading the ihl field\nonly once."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The OOB write in ip_vs_nat_icmp() requires a local process to change the embedded IPv4 ihl in skb frags between ip_vs_fill_iph_skb_icmp() validation and the NAT write; remote-only ICMP to IPVS netfilter hooks cannot perform that TOCTOU without local access to the packet buffer.\nAC:L - A local attacker controls both sides of the race by concurrently injecting ICMP errors with TCP/UDP/SCTP payloads matching an IPVS NAT connection and modifying the embedded header ihl in skb frags during softirq processing; no victim-specific state or uncontrollable heap layout is required.\nPR:L - Triggering requires a local account able to race skb frag modification (e.g., via raw/packet sockets with CAP_NET_RAW, obtainable in a user namespace) against IPVS ICMP NAT handling on a host where IPVS is already configured; no init-namespace root is needed.\nUI:N - No victim user interaction is required; exploitation is driven entirely by attacker-controlled local packet injection and concurrent frag modification while IPVS processes ICMP errors on NAT-mode connections through LOCAL_IN, LOCAL_OUT, or FORWARD hooks.\nS:U - The out-of-bounds write corrupts kernel skb memory on the IPVS load-balancer host within the same kernel security authority; it does not cross VM, container, or IOMMU boundaries into a separate security scope.\nC:H - Writing TCP/UDP/SCTP port fields and running ip_send_check() using a re-read inflated ihl corrupts skb data beyond the validated region; out-of-bounds kernel memory corruption is exploitable for information disclosure and heap layout control.\nI:H - The bug is an out-of-bounds write of 16-bit port values (and checksum updates over an attacker-inflated header length) past skb_ensure_writable()\u0027s bound, enabling adjacent kernel memory corruption and potential control-flow hijacking on internet-facing IPVS NAT nodes.\nA:H - Corrupting skb header memory beyond the ensured writable area can cause kernel oops or panic during ICMP NAT mangling; a local attacker can repeatedly trigger the race on kube-proxy IPVS nodes and hardware load balancers running IPVS NAT mode."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-25T05:42:04.705Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/3b8f79af0e98f27b932b0b416e9c52b692d31ff9"
},
{
"url": "https://git.kernel.org/stable/c/3c779b258c9c3c3567af68d4f45c2f751f35bd0e"
},
{
"url": "https://git.kernel.org/stable/c/be65fa324640c7a95e30b146159a2be5cc73f22e"
},
{
"url": "https://git.kernel.org/stable/c/a69a4b3fff5814d079beff9a1e9d369994b2ed47"
},
{
"url": "https://git.kernel.org/stable/c/243d0187ec4c3837b9b0004f18d1068e46115760"
},
{
"url": "https://git.kernel.org/stable/c/646922a0379496154e8c8faca4f8e2fd9100cacc"
}
],
"title": "ipvs: avoid out-of-bounds write in ip_vs_nat_icmp",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74724",
"datePublished": "2026-08-22T15:33:15.832Z",
"dateReserved": "2026-08-15T05:44:03.929Z",
"dateUpdated": "2026-08-25T05:42:04.705Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-74724",
"date": "2026-10-15",
"epss": "0.00123",
"percentile": "0.01854"
},
"microsoft_vex": {
"current_release_date": "2026-09-25T02:04:37.000Z",
"cve": "CVE-2026-74724",
"id": "msrc_CVE-2026-74724",
"initial_release_date": "2026-08-24T01:06:55.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "ipvs: avoid out-of-bounds write in ip_vs_nat_icmp",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74724.json",
"version": "4"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"include/net/ip_vs.h",
"net/netfilter/ipvs/ip_vs_core.c",
"net/netfilter/ipvs/ip_vs_xmit.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"status": "affected",
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{
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"versionType": "git"
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.12"
},
{
"lessThan": "2.6.12",
"status": "unaffected",
"version": "0",
"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.*",
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"version": "6.18.45",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: avoid out-of-bounds write in ip_vs_nat_icmp\n\nSashiko warns that local attacker can modify the packet\nwhile it is processed by IPVS. Some places read the\nIP ihl field multiple times which can cause out-of-bounds\naccess. One such place is ip_vs_nat_icmp where we\ncan write after the validated area.\n\nFix it by providing ciph argument just like it is done for\nIPv6 and use ciph-\u003elen as offset to the embedded transport\nheader.\n\nModify some IPv4 header checks by reading the ihl field\nonly once."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nipvs: evitar escritura fuera de l\u00edmites en ip_vs_nat_icmp\n\nSashiko advierte que un atacante local puede modificar el paquete mientras es procesado por IPVS. Algunos lugares leen el campo ihl de IP varias veces, lo que puede causar acceso fuera de l\u00edmites. Uno de esos lugares es ip_vs_nat_icmp, donde podemos escribir despu\u00e9s del \u00e1rea validada.\n\nSe soluciona proporcionando el argumento ciph tal como se hace para IPv6 y usando ciph -\u003e len como desplazamiento al encabezado de transporte incrustado.\n\nModificar algunas comprobaciones del encabezado IPv4 leyendo el campo ihl solo una vez."
}
],
"id": "CVE-2026-74724",
"lastModified": "2026-10-14T13:10:00.187",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"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"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-22T16:16:47.450",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/243d0187ec4c3837b9b0004f18d1068e46115760"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/3b8f79af0e98f27b932b0b416e9c52b692d31ff9"
},
{
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"url": "https://git.kernel.org/stable/c/3c779b258c9c3c3567af68d4f45c2f751f35bd0e"
},
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"url": "https://git.kernel.org/stable/c/646922a0379496154e8c8faca4f8e2fd9100cacc"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/a69a4b3fff5814d079beff9a1e9d369994b2ed47"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/be65fa324640c7a95e30b146159a2be5cc73f22e"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-25T08:56:11+00:00",
"cve": "CVE-2026-74724",
"id": "CVE-2026-74724",
"initial_release_date": "2026-08-22T00:00:00+00:00",
"product_status:known_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ipvs: avoid out-of-bounds write in ip_vs_nat_icmp",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74724.json",
"version": "3"
}
}
}
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