Exploitation evidence
Known exploited · CISA KEV listed
Added 2026-09-18. Ransomware campaign use: Unknown.
CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CISA due date: 2026-09-21. This is the catalog’s deadline, not an assessment of your organization’s exposure.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
Linux / Linux
Default status: unaffected
- affected: 63137bc5882a1882c553d389fdeeeace86ee1741 to < bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87 (git)
- affected: 63137bc5882a1882c553d389fdeeeace86ee1741 to < 76280b78cc9f23bdc6438e10ad6dff148ef8375b (git)
- affected: 63137bc5882a1882c553d389fdeeeace86ee1741 to < b7e91939ba9be805a62a257fa4e227dffbb88fa0 (git)
- affected: 63137bc5882a1882c553d389fdeeeace86ee1741 to < afd64b59c3de9bbbdd3759e834fdc55cda716e0b (git)
- affected: 63137bc5882a1882c553d389fdeeeace86ee1741 to < 153ea96c806aea395daba907a4f88480b6ad5093 (git)
- affected: 63137bc5882a1882c553d389fdeeeace86ee1741 to < b18675263db1147c8e1cab625400c13a0d87bd2d (git)
- affected: 63137bc5882a1882c553d389fdeeeace86ee1741 to < c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5 (git)
- affected: 63137bc5882a1882c553d389fdeeeace86ee1741 to < 67ba971ae02514d85818fe0c32549ab4bfa3bf49 (git)
- affected: 2f3839075a5f8dcf116c1abe35b36b018ac62445 (git)
- affected: 51ba2945a8ef65ae437c8f9ba05f0343aa82ae5b (git)
- affected: b7d23c2c87584eb429f115c078ed511be8b18e29 (git)
- affected: 5.4.73 to < 5.5 (semver)
- affected: 5.8.17 to < 5.9 (semver)
- affected: 5.9.2 to < 5.10 (semver)
Linux / Linux
Default status: affected
- affected: 5.10
- unaffected: 0 to < 5.10 (semver)
- unaffected: 5.10.259 to ≤ 5.10.* (semver)
- unaffected: 5.15.210 to ≤ 5.15.* (semver)
- unaffected: 6.1.176 to ≤ 6.1.* (semver)
- unaffected: 6.6.143 to ≤ 6.6.* (semver)
- unaffected: 6.12.94 to ≤ 6.12.* (semver)
- unaffected: 6.18.36 to ≤ 6.18.* (semver)
- unaffected: 7.0.13 to ≤ 7.0.* (semver)
- unaffected: 7.1 to ≤ * (original_commit_for_fix)
Fixes and workarounds
No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.
Sources and related reporting
CVE Program record ↗ · Download tracked evidence as JSON
- https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87
- https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b
- https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0
- https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b
- https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093
- https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d
- https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5
- https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-53266
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.00934,
"percentile": 0.61233
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.00934,
"percentile": 0.61062
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.00934,
"percentile": 0.61015
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.00934,
"percentile": 0.61
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.00934,
"percentile": 0.60984
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.00934,
"percentile": 0.60928
}06 Nov 2026, 06:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.00934,
"percentile": 0.60899
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.00934,
"percentile": 0.60873
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.00934,
"percentile": 0.60812
}03 Nov 2026, 06:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-53266",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-18T00:00:00+00:00",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2026-09-18",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-53266"
},
"type": "kev"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-787",
"description": "CWE-787 Out-of-bounds Write",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-19T03:56:22.274Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"government-resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-53266"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-09-18T00:00:00.000Z",
"value": "CVE-2026-53266 added to CISA KEV"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
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"product": "Linux",
"programFiles": [
"net/bridge/netfilter/ebt_snat.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"status": "affected",
"version": "63137bc5882a1882c553d389fdeeeace86ee1741",
"versionType": "git"
},
{
"lessThan": "76280b78cc9f23bdc6438e10ad6dff148ef8375b",
"status": "affected",
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{
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{
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"versionType": "git"
},
{
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"status": "affected",
"version": "63137bc5882a1882c553d389fdeeeace86ee1741",
"versionType": "git"
},
{
"lessThan": "b18675263db1147c8e1cab625400c13a0d87bd2d",
"status": "affected",
"version": "63137bc5882a1882c553d389fdeeeace86ee1741",
"versionType": "git"
},
{
"lessThan": "c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5",
"status": "affected",
"version": "63137bc5882a1882c553d389fdeeeace86ee1741",
"versionType": "git"
},
{
"lessThan": "67ba971ae02514d85818fe0c32549ab4bfa3bf49",
"status": "affected",
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"versionType": "git"
},
{
"status": "affected",
"version": "2f3839075a5f8dcf116c1abe35b36b018ac62445",
"versionType": "git"
},
{
"status": "affected",
"version": "51ba2945a8ef65ae437c8f9ba05f0343aa82ae5b",
"versionType": "git"
},
{
"status": "affected",
"version": "b7d23c2c87584eb429f115c078ed511be8b18e29",
"versionType": "git"
},
{
"lessThan": "5.5",
"status": "affected",
"version": "5.4.73",
"versionType": "semver"
},
{
"lessThan": "5.9",
"status": "affected",
"version": "5.8.17",
"versionType": "semver"
},
{
"lessThan": "5.10",
"status": "affected",
"version": "5.9.2",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/bridge/netfilter/ebt_snat.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.10"
},
{
"lessThan": "5.10",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.94",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.36",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.13",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.259",
"versionStartIncluding": "5.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.210",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
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},
{
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"versionEndExcluding": "6.12.94",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.36",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
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},
{
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"versionStartIncluding": "5.4.73",
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},
{
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"versionStartIncluding": "5.8.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.9.2",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: make ebt_snat ARP rewrite writable\n\nThe ebtables SNAT target keeps the Ethernet source address rewrite\nbehind skb_ensure_writable(skb, 0). This is intentional: at the bridge\nebtables hooks the Ethernet header is addressed through\nskb_mac_header()/eth_hdr(), while skb->data points at the Ethernet\npayload. Asking skb_ensure_writable() for ETH_HLEN bytes would check\nthe payload, not the Ethernet header, and would reintroduce the small\npacket regression fixed by commit 63137bc5882a.\n\nHowever, the optional ARP sender hardware address rewrite is different.\nIt writes through skb_store_bits() at an offset relative to skb->data:\n\n skb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN)\n\nskb_header_pointer() only safely reads the ARP header; it does not make\nthe later sender hardware address range writable. If that range is\nstill held in a nonlinear skb fragment backed by a splice-imported file\npage, skb_store_bits() maps the frag page and copies the new MAC address\ndirectly into it.\n\nEnsure the ARP SHA range is writable before reading the ARP header and\nbefore calling skb_store_bits()."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - Exploitation requires local control of bridge/ebtables configuration and arranging an skb with shared non-linear backing memory; remote ARP traffic alone cannot create the splice-backed page condition.\nAC:L - There is no race or rare external timing condition; the attacker can control the rule, ARP frame layout, and shared-frag setup needed to reach the write.\nPR:L - The ebtables rule path requires CAP_NET_ADMIN, but this is reachable with namespace-local privileges via user/network namespaces rather than requiring init-namespace root.\nUI:N - No victim action is required once the attacker can configure the namespace and send the crafted traffic through the bridge path.\nS:C - The bug can let namespace-local network privileges corrupt file-backed/page-cache memory outside the bridge/netfilter security boundary, plausibly crossing a sandbox or namespace boundary.\nC:H - The shared-page corruption can be leveraged toward privilege escalation or code execution, which can expose high-value system data.\nI:H - skb_store_bits() writes attacker-chosen MAC bytes into shared backing pages, giving a controlled corruption primitive against file-backed memory.\nA:H - Controlled corruption of shared/file-backed pages can damage critical files or executable contents and can be repeated to cause severe system availability impact."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:34:43.383Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87"
},
{
"url": "https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b"
},
{
"url": "https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0"
},
{
"url": "https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b"
},
{
"url": "https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093"
},
{
"url": "https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d"
},
{
"url": "https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5"
},
{
"url": "https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49"
}
],
"title": "netfilter: bridge: make ebt_snat ARP rewrite writable",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-53266",
"datePublished": "2026-06-25T08:39:53.190Z",
"dateReserved": "2026-06-09T07:44:35.395Z",
"dateUpdated": "2026-09-19T03:56:22.274Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.00934,
"percentile": 0.60768
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2026-53266",
"cwes": [
"CWE-787"
],
"dateAdded": "2026-09-18",
"dueDate": "2026-09-21",
"forensicTriage": "Yes",
"knownRansomwareCampaignUse": "Unknown",
"notes": "This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: ; https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87; https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b; https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0; https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b; https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093; https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d; https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5; https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-53266",
"product": "Kernel",
"requiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
"shortDescription": "Linux Kernel contains an out-of-bounds write vulnerability in the ebtables SNAT target which allows an ARP sender hardware address rewrite to write directly into a nonlinear socket-buffer fragment backed by a splice-imported file page. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.",
"vendorProject": "Linux",
"vulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability"
}