CVE-2026-80901
In the Linux kernel, the following vulnerability has been resolved:
ipvs: fix the checksum validations
ip_vs_in_icmp_v6() is missing checksum validation for ICMPv6 packets from clients. In fact, as for TCP/UDP we should validate the checksum for ICMP packets only when we mangle the packets on MASQ or on reply for tunnel.
Also, Sashiko points out that handle_response_icmp() being common for IPv4 and IPv6 is missing the pseudo-header calculation while validating ICMPv6 messages from real servers which is a problem if checksum is not validated by the hardware.
Fix the problems by creating ip_vs_checksum_common_check() helper and use it for TCP/UDP/ICMP both for IPv4 and IPv6. Rely on the nf_checksum() for validating the ICMP messages but use it also for TCP and UDP.
Leer descripción completaMostrar menos
Use correct IP offset for IP_VS_DBG_RL_PKT for TCP/UDP/SCTP.
IPVS packets (TCP/UDP/SCTP/ICMP) do not need checksum validation on LOCAL_OUT (local clients or local real servers) and on FORWARD (traffic from servers on LAN). Do it only on LOCAL_IN, in case nf_checksum() is not called on PRE_ROUTING.
Also, ip_vs_checksum_complete() can be marked static.
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.21%
- Percentil entre todas las CVEs puntuadas: 11
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/00eb23829fd08df1b5e057cb6b625996a70e7e65
- https://git.kernel.org/stable/c/5558a85add073215b298f3e044ff9a6d86d714ae
- https://git.kernel.org/stable/c/9cbe2c0fdb71904ee929b1851cdc1c73341a03c0
- https://git.kernel.org/stable/c/b3869d9b54e76dff64118dee4c8fd9302fcd5171
- https://git.kernel.org/stable/c/d418d73acf8be62744dc47359dfdde8c2148845d
- https://git.kernel.org/stable/c/e876b75b9020a97bbdc79721e7fc749024891c65
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-80901",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2a3b791e6e1169f374224d164738e9f7be703d77",
"lessThan": "d418d73acf8be62744dc47359dfdde8c2148845d",
"versionType": "git"
},
{
"status": "affected",
"version": "2a3b791e6e1169f374224d164738e9f7be703d77",
"lessThan": "b3869d9b54e76dff64118dee4c8fd9302fcd5171",
"versionType": "git"
},
{
"status": "affected",
"version": "2a3b791e6e1169f374224d164738e9f7be703d77",
"lessThan": "9cbe2c0fdb71904ee929b1851cdc1c73341a03c0",
"versionType": "git"
},
{
"status": "affected",
"version": "2a3b791e6e1169f374224d164738e9f7be703d77",
"lessThan": "00eb23829fd08df1b5e057cb6b625996a70e7e65",
"versionType": "git"
},
{
"status": "affected",
"version": "2a3b791e6e1169f374224d164738e9f7be703d77",
"lessThan": "5558a85add073215b298f3e044ff9a6d86d714ae",
"versionType": "git"
},
{
"status": "affected",
"version": "2a3b791e6e1169f374224d164738e9f7be703d77",
"lessThan": "e876b75b9020a97bbdc79721e7fc749024891c65",
"versionType": "git"
}
],
"programFiles": [
"include/net/ip_vs.h",
"net/netfilter/ipvs/ip_vs_core.c",
"net/netfilter/ipvs/ip_vs_proto_sctp.c",
"net/netfilter/ipvs/ip_vs_proto_tcp.c",
"net/netfilter/ipvs/ip_vs_proto_udp.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.28"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.28",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"include/net/ip_vs.h",
"net/netfilter/ipvs/ip_vs_core.c",
"net/netfilter/ipvs/ip_vs_proto_sctp.c",
"net/netfilter/ipvs/ip_vs_proto_tcp.c",
"net/netfilter/ipvs/ip_vs_proto_udp.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-09-04T18:17:58.767",
"references": [
{
"url": "https://git.kernel.org/stable/c/00eb23829fd08df1b5e057cb6b625996a70e7e65",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/5558a85add073215b298f3e044ff9a6d86d714ae",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9cbe2c0fdb71904ee929b1851cdc1c73341a03c0",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b3869d9b54e76dff64118dee4c8fd9302fcd5171",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d418d73acf8be62744dc47359dfdde8c2148845d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e876b75b9020a97bbdc79721e7fc749024891c65",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: fix the checksum validations\n\nip_vs_in_icmp_v6() is missing checksum validation for ICMPv6\npackets from clients. In fact, as for TCP/UDP we should\nvalidate the checksum for ICMP packets only when we\nmangle the packets on MASQ or on reply for tunnel.\n\nAlso, Sashiko points out that handle_response_icmp() being\ncommon for IPv4 and IPv6 is missing the pseudo-header\ncalculation while validating ICMPv6 messages from real\nservers which is a problem if checksum is not validated\nby the hardware.\n\nFix the problems by creating ip_vs_checksum_common_check()\nhelper and use it for TCP/UDP/ICMP both for IPv4 and IPv6.\nRely on the nf_checksum() for validating the ICMP messages\nbut use it also for TCP and UDP.\n\nUse correct IP offset for IP_VS_DBG_RL_PKT for TCP/UDP/SCTP.\n\nIPVS packets (TCP/UDP/SCTP/ICMP) do not need checksum\nvalidation on LOCAL_OUT (local clients or local real\nservers) and on FORWARD (traffic from servers on LAN).\nDo it only on LOCAL_IN, in case nf_checksum() is not\ncalled on PRE_ROUTING.\n\nAlso, ip_vs_checksum_complete() can be marked static."
}
],
"lastModified": "2026-09-04T18:17:58.767",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}