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vuln-cve/data/2026/68xxx/CVE-2026-68476.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-68476",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-07-30T09:28:09.396Z",
"datePublished": "2026-08-15T05:51:32.170Z",
"dateUpdated": "2026-09-02T12:49:42.932Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-09-02T12:49:42.932Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: reload ip header after head reallocation\n\n__ip_vs_get_out_rt() calls skb_ensure_writable() which may\nreallocate skb->head."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 9.8,
"baseSeverity": "CRITICAL"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The flaw is in ip_vs_bypass_xmit() on the IPVS netfilter receive path (NF_INET_LOCAL_IN/FORWARD); remote IPv4 packets to a configured virtual-server VIP reach ip_vs_in_hook() and ip_vs_leave() without local syscalls or ioctl.\nAC:L - Once cache_bypass is enabled on a fwmark IPVS service with no backend, an attacker can repeatedly send traffic to the VIP; cloned skbs (common with bridging, mirroring, or shared receive buffers) make skb_ensure_writable() reallocate skb->head deterministically.\nPR:N - Exploitation requires only sending IP packets to the load balancer VIP; IPVS/cache_bypass configuration is an operator prerequisite on the target, not a Linux capability the remote attacker must hold.\nUI:N - No victim interaction is required; kernel processing of attacker-crafted network packets on the IPVS bypass transmit path alone triggers the stale header pointer use after skb head reallocation.\nS:U - Impact is kernel heap corruption and load-balancer compromise within the host kernel security domain; it does not cross VM, container, or IOMMU boundaries to another security authority.\nC:H - After pskb_expand_head() frees the old skb->head, ip_send_check() uses the stale iph pointer and ip_fast_csum() reads attacker-influenced bytes from freed kmalloc memory, a classic use-after-free information disclosure primitive.\nI:H - ip_send_check() writes through the stale iph pointer (zeroing and updating the checksum field) into freed/reallocated slab memory, enabling heap corruption and potential arbitrary kernel write or control-flow hijack primitives.\nA:H - Writing and reading through a stale IP header pointer after skb head reallocation can corrupt adjacent kernel heap objects or dereference freed memory, causing kernel oops, panic, or hang and repeatable denial of service."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/netfilter/ipvs/ip_vs_xmit.c"
],
"versions": [
{
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"lessThan": "4f2d1151421520d7ae16ca8d367d0ca09f5dfbd7",
"status": "affected",
"versionType": "git"
},
{
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"lessThan": "657118cad620172dfd8f6ed5717fd75c0d1f7a5a",
"status": "affected",
"versionType": "git"
},
{
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"lessThan": "a10f5080afbed242640f2984328de25f84557da1",
"status": "affected",
"versionType": "git"
},
{
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"lessThan": "ac6ac3d35bfc0ade9d17d354c84e503a946ebdab",
"status": "affected",
"versionType": "git"
},
{
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"lessThan": "e51687fc56c2e39ea6e9532925f1aabd4d529f61",
"status": "affected",
"versionType": "git"
},
{
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"lessThan": "3fb7edd2018bb1ad0a68157383d9b9dac33dd645",
"status": "affected",
"versionType": "git"
},
{
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"lessThan": "ad1e14710b360bda087ebf9fb82460eb5ef775de",
"status": "affected",
"versionType": "git"
},
{
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"lessThan": "a2f57827bf7c695b8c72dc4511cae8e86582369d",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/netfilter/ipvs/ip_vs_xmit.c"
],
"versions": [
{
"version": "4.10",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.10",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.269",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.220",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.187",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.145",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.97",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.40",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.1.5",
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.10",
"versionEndExcluding": "5.10.269"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.10",
"versionEndExcluding": "6.6.145"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.10",
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{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.10",
"versionEndExcluding": "6.18.40"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.10",
"versionEndExcluding": "7.1.5"
},
{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.10",
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}
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],
"references": [
{
"url": "https://git.kernel.org/stable/c/4f2d1151421520d7ae16ca8d367d0ca09f5dfbd7"
},
{
"url": "https://git.kernel.org/stable/c/657118cad620172dfd8f6ed5717fd75c0d1f7a5a"
},
{
"url": "https://git.kernel.org/stable/c/a10f5080afbed242640f2984328de25f84557da1"
},
{
"url": "https://git.kernel.org/stable/c/ac6ac3d35bfc0ade9d17d354c84e503a946ebdab"
},
{
"url": "https://git.kernel.org/stable/c/e51687fc56c2e39ea6e9532925f1aabd4d529f61"
},
{
"url": "https://git.kernel.org/stable/c/3fb7edd2018bb1ad0a68157383d9b9dac33dd645"
},
{
"url": "https://git.kernel.org/stable/c/ad1e14710b360bda087ebf9fb82460eb5ef775de"
},
{
"url": "https://git.kernel.org/stable/c/a2f57827bf7c695b8c72dc4511cae8e86582369d"
}
],
"title": "ipvs: reload ip header after head reallocation",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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