CVE-2026-53266

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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": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", 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"git"}, {"version": "63137bc5882a1882c553d389fdeeeace86ee1741", "lessThan": "c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5", "status": "affected", "versionType": "git"}, {"version": "63137bc5882a1882c553d389fdeeeace86ee1741", "lessThan": "67ba971ae02514d85818fe0c32549ab4bfa3bf49", "status": "affected", "versionType": "git"}, {"version": "2f3839075a5f8dcf116c1abe35b36b018ac62445", "status": "affected", "versionType": "git"}, {"version": "51ba2945a8ef65ae437c8f9ba05f0343aa82ae5b", "status": "affected", "versionType": "git"}, {"version": "b7d23c2c87584eb429f115c078ed511be8b18e29", "status": "affected", "versionType": "git"}, {"version": "5.4.73", "lessThan": "5.5", "status": "affected", "versionType": "semver"}, {"version": "5.8.17", "lessThan": "5.9", "status": "affected", "versionType": "semver"}, {"version": "5.9.2", "lessThan": "5.10", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bridge/netfilter/ebt_snat.c"], "versions": [{"version": "5.10", "status": "affected"}, {"version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.94", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.13", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "5.10", "versionEndExcluding": "5.10.259"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.15.210"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.1.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.6.143"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.12.94"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.18.36"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "7.0.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "7.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.73"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8.17"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9.2"}]}]}], "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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-18T00:00:00+00:00", "options": [{"Exploitation": "active"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3", "id": "CVE-2026-53266"}}}, {"other": {"type": "kev", "content": {"dateAdded": "2026-09-18", "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-53266"}}}], "references": [{"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-53266", "tags": ["government-resource"]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-787", "description": "CWE-787 Out-of-bounds Write"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-19T03:56:22.274Z"}, "timeline": [{"time": "2026-09-18T00:00:00.000Z", "lang": "en", "value": "CVE-2026-53266 added to CISA KEV"}]}]}}

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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."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "63137bc5882a1882c553d389fdeeeace86ee1741", "lessThan": "bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87", "versionType": "git"}, {"status": "affected", "version": "63137bc5882a1882c553d389fdeeeace86ee1741", "lessThan": "76280b78cc9f23bdc6438e10ad6dff148ef8375b", "versionType": "git"}, {"status": "affected", "version": "63137bc5882a1882c553d389fdeeeace86ee1741", "lessThan": "b7e91939ba9be805a62a257fa4e227dffbb88fa0", "versionType": "git"}, {"status": "affected", "version": "63137bc5882a1882c553d389fdeeeace86ee1741", "lessThan": "afd64b59c3de9bbbdd3759e834fdc55cda716e0b", "versionType": "git"}, {"status": "affected", "version": "63137bc5882a1882c553d389fdeeeace86ee1741", "lessThan": "153ea96c806aea395daba907a4f88480b6ad5093", "versionType": "git"}, {"status": "affected", "version": "63137bc5882a1882c553d389fdeeeace86ee1741", "lessThan": "b18675263db1147c8e1cab625400c13a0d87bd2d", "versionType": "git"}, {"status": "affected", "version": "63137bc5882a1882c553d389fdeeeace86ee1741", "lessThan": "c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5", "versionType": "git"}, {"status": "affected", "version": "63137bc5882a1882c553d389fdeeeace86ee1741", "lessThan": "67ba971ae02514d85818fe0c32549ab4bfa3bf49", "versionType": "git"}, {"status": "affected", "version": "2f3839075a5f8dcf116c1abe35b36b018ac62445", "versionType": "git"}, {"status": "affected", "version": "51ba2945a8ef65ae437c8f9ba05f0343aa82ae5b", "versionType": "git"}, {"status": "affected", "version": "b7d23c2c87584eb429f115c078ed511be8b18e29", "versionType": "git"}, {"status": "affected", "version": "5.4.73", "lessThan": "5.5", "versionType": "semver"}, {"status": "affected", "version": "5.8.17", "lessThan": "5.9", "versionType": "semver"}, {"status": "affected", "version": "5.9.2", "lessThan": "5.10", "versionType": "semver"}], "programFiles": ["net/bridge/netfilter/ebt_snat.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.10"}, {"status": "unaffected", "version": "0", "lessThan": "5.10", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.259", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.210", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.176", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.143", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.94", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.36", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.13", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/bridge/netfilter/ebt_snat.c"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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()."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.259", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.210", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.176", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.143", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.94", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.36", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.13", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.4.73"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.8.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.9.2"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:34:43.383Z"}}}, "cveMetadata": {"cveId": "CVE-2026-53266", "state": "PUBLISHED", "dateUpdated": "2026-09-19T03:56:22.274Z", "dateReserved": "2026-06-09T07:44:35.395Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-06-25T08:39:53.190Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "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": [{"lessThan": "bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87", "status": "affected", "version": "63137bc5882a1882c553d389fdeeeace86ee1741", "versionType": "git"}, {"lessThan": "76280b78cc9f23bdc6438e10ad6dff148ef8375b", "status": "affected", "version": "63137bc5882a1882c553d389fdeeeace86ee1741", "versionType": "git"}, {"lessThan": "b7e91939ba9be805a62a257fa4e227dffbb88fa0", "status": "affected", "version": "63137bc5882a1882c553d389fdeeeace86ee1741", "versionType": "git"}, {"lessThan": "afd64b59c3de9bbbdd3759e834fdc55cda716e0b", "status": "affected", "version": "63137bc5882a1882c553d389fdeeeace86ee1741", "versionType": "git"}, {"lessThan": "153ea96c806aea395daba907a4f88480b6ad5093", "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", "version": "63137bc5882a1882c553d389fdeeeace86ee1741", "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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cisaActionDue": "2026-09-21", "cisaExploitAdd": "2026-09-18", "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA\u2019s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA\u2019s \u201cForensics Triage Requirements\u201d (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.", "cisaVulnerabilityName": "Linux Kernel Out-of-Bounds Write Vulnerability", "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "886AB560-B760-44F0-AD89-3F275E4C0F58", "versionEndExcluding": "5.5", "versionStartIncluding": "5.4.73", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "BEFC3ACE-365D-48E7-9C0A-019C74CC0725", "versionEndExcluding": "5.9", "versionStartIncluding": "5.8.17", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "992FFB71-217E-40A6-B8BD-5AA742898F28", "versionEndExcluding": "5.10.259", "versionStartIncluding": "5.9.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "5E938CDF-D1C4-43D0-98DC-9E11B6B55801", "versionEndExcluding": "5.15.210", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C4446623-5F2B-4DD8-8666-9FAAC285A757", "versionEndExcluding": "6.1.176", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9062F1CD-CAD6-4EA2-A73F-C06D4A887B8C", "versionEndExcluding": "6.6.143", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "85421C0C-ABDE-4357-971C-67F9087DE1B9", "versionEndExcluding": "6.12.94", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "389025D2-958D-41BD-BD96-70ED1033A9F3", "versionEndExcluding": "6.18.36", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "6A64BF9F-3BCA-42FD-98CB-8F03474D2B1E", "versionEndExcluding": "7.0.13", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*", "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*", "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*", "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*", "matchCriteriaId": "81DFF19E-9CF8-49C6-8C36-1E4038622933", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*", "matchCriteriaId": "B0E8FC71-3952-444C-83E9-718DBBBEC615", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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()."}], "id": "CVE-2026-53266", "lastModified": "2026-09-19T04:17:53.580", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53266", "options": [{"exploitation": "active"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-09-18T00:00:00+00:00", "version": "2.0.3"}}]}, "published": "2026-06-25T09:16:44.643", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["US Government Resource"], "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-53266"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-787"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: netfilter: bridge: make ebt_snat ARP rewrite writable", "id": "2492810", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492810"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: bridge: make ebt_snat ARP rewrite writable\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.\nHowever, the optional ARP sender hardware address rewrite is different.\nIt writes through skb_store_bits() at an offset relative to skb->data:\nskb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN)\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.\nEnsure the ARP SHA range is writable before reading the ARP header and\nbefore calling skb_store_bits().", "A flaw was found in the Linux kernel's netfilter bridge ebtables SNAT (Source Network Address Translation) module. This vulnerability allows a local attacker on a system configured with specific bridge netfilter rules to improperly modify underlying memory pages during an ARP (Address Resolution Protocol) sender hardware address rewrite. This could lead to unintended system behavior, a denial of service, or potentially local privilege escalation, where an attacker gains higher access rights than intended."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, prevent module ebt_snat from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically."}, "name": "CVE-2026-53266", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53266\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53266\nhttps://lore.kernel.org/linux-cve-announce/2026062517-CVE-2026-53266-6162@gregkh/T"], "statement": "An ARP sender hardware address rewrite in ebtables SNAT can write into a non linear skb fragment that was not made writable first. The write is performed by skb_store_bits() at an offset relative to packet data, while skb_header_pointer() only provides a safe read of the ARP header and does not make the later SHA range writable. If that range is backed by a splice imported file page, the MAC rewrite can modify the underlying page rather than a private writable packet buffer. The issue is not a normal remote IP packet path, but it can be relevant on hosts using bridge netfilter ebtables SNAT rules. Impact is at least integrity impact through unintended page modification and may allow local privilege escalation or denial of service depending on what backing page is modified.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[63137bc5882a1882c553d389fdeeeace86ee1741,bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[63137bc5882a1882c553d389fdeeeace86ee1741,76280b78cc9f23bdc6438e10ad6dff148ef8375b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[63137bc5882a1882c553d389fdeeeace86ee1741,b7e91939ba9be805a62a257fa4e227dffbb88fa0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[63137bc5882a1882c553d389fdeeeace86ee1741,afd64b59c3de9bbbdd3759e834fdc55cda716e0b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[63137bc5882a1882c553d389fdeeeace86ee1741,153ea96c806aea395daba907a4f88480b6ad5093)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[63137bc5882a1882c553d389fdeeeace86ee1741,b18675263db1147c8e1cab625400c13a0d87bd2d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[63137bc5882a1882c553d389fdeeeace86ee1741,c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[63137bc5882a1882c553d389fdeeeace86ee1741,67ba971ae02514d85818fe0c32549ab4bfa3bf49)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "2f3839075a5f8dcf116c1abe35b36b018ac62445"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "51ba2945a8ef65ae437c8f9ba05f0343aa82ae5b"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "b7d23c2c87584eb429f115c078ed511be8b18e29"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.4.73,5.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.8.17,5.9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.9.2,5.10)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.10"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.10)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.259,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.210,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.176,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.143,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.94,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.36,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.13,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-06-25T12:15:03.845002+00:00", "updated": "2026-09-21T09:30:13.064228+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}