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

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-28 06:41
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)
Create a notification for this product.
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)
Create a notification for this product.
Show details on NVD website
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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-\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 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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-07-14T10:52:02+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"
    }
  }
}



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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.