CVE-2026-68476 (GCVE-0-2026-68476)
Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-09-02 12:49
VLAI
EPSS
VEX
Title
ipvs: reload ip header after head reallocation
Summary
In the Linux kernel, the following vulnerability has been resolved:
ipvs: reload ip header after head reallocation
__ip_vs_get_out_rt() calls skb_ensure_writable() which may
reallocate skb->head.
Severity
9.8 (Critical)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
8d8e20e2d7bba8c50e64e0eca1cb83956f468e49 , < 4f2d1151421520d7ae16ca8d367d0ca09f5dfbd7
(git)
Affected: 8d8e20e2d7bba8c50e64e0eca1cb83956f468e49 , < 657118cad620172dfd8f6ed5717fd75c0d1f7a5a (git) Affected: 8d8e20e2d7bba8c50e64e0eca1cb83956f468e49 , < a10f5080afbed242640f2984328de25f84557da1 (git) Affected: 8d8e20e2d7bba8c50e64e0eca1cb83956f468e49 , < ac6ac3d35bfc0ade9d17d354c84e503a946ebdab (git) Affected: 8d8e20e2d7bba8c50e64e0eca1cb83956f468e49 , < e51687fc56c2e39ea6e9532925f1aabd4d529f61 (git) Affected: 8d8e20e2d7bba8c50e64e0eca1cb83956f468e49 , < 3fb7edd2018bb1ad0a68157383d9b9dac33dd645 (git) Affected: 8d8e20e2d7bba8c50e64e0eca1cb83956f468e49 , < ad1e14710b360bda087ebf9fb82460eb5ef775de (git) Affected: 8d8e20e2d7bba8c50e64e0eca1cb83956f468e49 , < a2f57827bf7c695b8c72dc4511cae8e86582369d (git) |
guessed | |
| Linux | Linux |
Affected:
4.10
Unaffected: 0 , < 4.10 (semver) Unaffected: 5.10.269 , ≤ 5.10.* (semver) Unaffected: 5.15.220 , ≤ 5.15.* (semver) Unaffected: 6.1.187 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/netfilter/ipvs/ip_vs_xmit.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "4f2d1151421520d7ae16ca8d367d0ca09f5dfbd7",
"status": "affected",
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"versionType": "git"
},
{
"lessThan": "657118cad620172dfd8f6ed5717fd75c0d1f7a5a",
"status": "affected",
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"versionType": "git"
},
{
"lessThan": "a10f5080afbed242640f2984328de25f84557da1",
"status": "affected",
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"versionType": "git"
},
{
"lessThan": "ac6ac3d35bfc0ade9d17d354c84e503a946ebdab",
"status": "affected",
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"versionType": "git"
},
{
"lessThan": "e51687fc56c2e39ea6e9532925f1aabd4d529f61",
"status": "affected",
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"versionType": "git"
},
{
"lessThan": "3fb7edd2018bb1ad0a68157383d9b9dac33dd645",
"status": "affected",
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"versionType": "git"
},
{
"lessThan": "ad1e14710b360bda087ebf9fb82460eb5ef775de",
"status": "affected",
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"versionType": "git"
},
{
"lessThan": "a2f57827bf7c695b8c72dc4511cae8e86582369d",
"status": "affected",
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/netfilter/ipvs/ip_vs_xmit.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.10"
},
{
"lessThan": "4.10",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.269",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.220",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.187",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"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": "5.10.269",
"versionStartIncluding": "4.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.220",
"versionStartIncluding": "4.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.187",
"versionStartIncluding": "4.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.145",
"versionStartIncluding": "4.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
"versionStartIncluding": "4.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
"versionStartIncluding": "4.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
"versionStartIncluding": "4.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "4.10",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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-\u003ehead."
}
],
"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 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-\u003ehead 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-\u003ehead, 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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-02T12:49:42.932Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-68476",
"datePublished": "2026-08-15T05:51:32.170Z",
"dateReserved": "2026-07-30T09:28:09.396Z",
"dateUpdated": "2026-09-02T12:49:42.932Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-68476",
"date": "2026-10-03",
"epss": "0.00714",
"percentile": "0.52036"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/netfilter/ipvs/ip_vs_xmit.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "4f2d1151421520d7ae16ca8d367d0ca09f5dfbd7",
"status": "affected",
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"versionType": "git"
},
{
"lessThan": "657118cad620172dfd8f6ed5717fd75c0d1f7a5a",
"status": "affected",
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"versionType": "git"
},
{
"lessThan": "a10f5080afbed242640f2984328de25f84557da1",
"status": "affected",
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"versionType": "git"
},
{
"lessThan": "ac6ac3d35bfc0ade9d17d354c84e503a946ebdab",
"status": "affected",
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"versionType": "git"
},
{
"lessThan": "e51687fc56c2e39ea6e9532925f1aabd4d529f61",
"status": "affected",
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"versionType": "git"
},
{
"lessThan": "3fb7edd2018bb1ad0a68157383d9b9dac33dd645",
"status": "affected",
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"versionType": "git"
},
{
"lessThan": "ad1e14710b360bda087ebf9fb82460eb5ef775de",
"status": "affected",
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"versionType": "git"
},
{
"lessThan": "a2f57827bf7c695b8c72dc4511cae8e86582369d",
"status": "affected",
"version": "8d8e20e2d7bba8c50e64e0eca1cb83956f468e49",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/netfilter/ipvs/ip_vs_xmit.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.10"
},
{
"lessThan": "4.10",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.269",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.220",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.187",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"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: reload ip header after head reallocation\n\n__ip_vs_get_out_rt() calls skb_ensure_writable() which may\nreallocate skb-\u003ehead."
}
],
"id": "CVE-2026-68476",
"lastModified": "2026-09-02T13:18:04.373",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-15T06:20:41.387",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/3fb7edd2018bb1ad0a68157383d9b9dac33dd645"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/4f2d1151421520d7ae16ca8d367d0ca09f5dfbd7"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/657118cad620172dfd8f6ed5717fd75c0d1f7a5a"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/a10f5080afbed242640f2984328de25f84557da1"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/a2f57827bf7c695b8c72dc4511cae8e86582369d"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ac6ac3d35bfc0ade9d17d354c84e503a946ebdab"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ad1e14710b360bda087ebf9fb82460eb5ef775de"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/e51687fc56c2e39ea6e9532925f1aabd4d529f61"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-15T01:33:06Z",
"cve": "CVE-2026-68476",
"id": "CVE-2026-68476",
"initial_release_date": "2026-09-07T16:23:58Z",
"product_status:known_affected": "358",
"product_status:known_not_affected": "4",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-68476",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68476.json",
"version": "4"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…