CVE-2026-53266 (GCVE-0-2026-53266)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-08-05 12:34
VLAI
Title
netfilter: bridge: make ebt_snat ARP rewrite writable
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: make ebt_snat ARP rewrite writable The ebtables SNAT target keeps the Ethernet source address rewrite behind skb_ensure_writable(skb, 0). This is intentional: at the bridge ebtables hooks the Ethernet header is addressed through skb_mac_header()/eth_hdr(), while skb->data points at the Ethernet payload. Asking skb_ensure_writable() for ETH_HLEN bytes would check the payload, not the Ethernet header, and would reintroduce the small packet regression fixed by commit 63137bc5882a. However, the optional ARP sender hardware address rewrite is different. It writes through skb_store_bits() at an offset relative to skb->data: skb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN) skb_header_pointer() only safely reads the ARP header; it does not make the later sender hardware address range writable. If that range is still held in a nonlinear skb fragment backed by a splice-imported file page, skb_store_bits() maps the frag page and copies the new MAC address directly into it. Ensure the ARP SHA range is writable before reading the ARP header and before calling skb_store_bits().
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87 (git)
Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < 76280b78cc9f23bdc6438e10ad6dff148ef8375b (git)
Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < b7e91939ba9be805a62a257fa4e227dffbb88fa0 (git)
Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < afd64b59c3de9bbbdd3759e834fdc55cda716e0b (git)
Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < 153ea96c806aea395daba907a4f88480b6ad5093 (git)
Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < b18675263db1147c8e1cab625400c13a0d87bd2d (git)
Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5 (git)
Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < 67ba971ae02514d85818fe0c32549ab4bfa3bf49 (git)
Affected: 2f3839075a5f8dcf116c1abe35b36b018ac62445 (git)
Affected: 51ba2945a8ef65ae437c8f9ba05f0343aa82ae5b (git)
Affected: b7d23c2c87584eb429f115c078ed511be8b18e29 (git)
Affected: 5.4.73 , < 5.5 (semver)
Affected: 5.8.17 , < 5.9 (semver)
Affected: 5.9.2 , < 5.10 (semver)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "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-\u003edata 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-\u003edata:\n\n        skb_store_bits(skb, sizeof(struct arphdr), info-\u003emac, 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()."
        }
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      "metrics": [
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            "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"
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            {
              "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."
            }
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        "dateUpdated": "2026-08-05T12:34:43.383Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b"
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          "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",
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  "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": "2026-08-05T12:34:43.383Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-53266",
      "date": "2026-08-08",
      "epss": "0.00121",
      "percentile": "0.02224"
    },
    "microsoft_vex": {
      "current_release_date": "2026-06-28T01:58:40.000Z",
      "cve": "CVE-2026-53266",
      "id": "msrc_CVE-2026-53266",
      "initial_release_date": "2026-06-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "netfilter: bridge: make ebt_snat ARP rewrite writable",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53266.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53266\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-25T09:16:44.643\",\"lastModified\":\"2026-07-08T04:02:04.290\",\"vulnStatus\":\"Analyzed\",\"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-\u003edata 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-\u003edata:\\n\\n        skb_store_bits(skb, sizeof(struct arphdr), info-\u003emac, 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().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bridge/netfilter/ebt_snat.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bridge/netfilter/ebt_snat.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.10\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.94\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.0,\"impactScore\":6.0}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.73\",\"versionEndExcluding\":\"5.5\",\"matchCriteriaId\":\"886AB560-B760-44F0-AD89-3F275E4C0F58\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.8.17\",\"versionEndExcluding\":\"5.9\",\"matchCriteriaId\":\"BEFC3ACE-365D-48E7-9C0A-019C74CC0725\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.9.2\",\"versionEndExcluding\":\"5.10.259\",\"matchCriteriaId\":\"992FFB71-217E-40A6-B8BD-5AA742898F28\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*: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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-05T14:31:09+00:00",
      "cve": "CVE-2026-53266",
      "id": "CVE-2026-53266",
      "initial_release_date": "2026-06-01T12:00:00+00:00",
      "product_status:fixed": "453",
      "product_status:known_affected": "99",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53266.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-28T17:12:43Z",
      "cve": "CVE-2026-53266",
      "id": "CVE-2026-53266",
      "initial_release_date": "2026-06-26T02:08:06Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "529",
      "product_status:known_not_affected": "93",
      "product_status:recommended": "326",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53266",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53266.json",
      "version": "12"
    }
  }
}



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Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.