--- title: "CVE-2026-53266: netfilter: bridge: make ebt_snat ARP… | CubePath" description: "In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: make ebt_snat ARP rewrite writable The ebtables SNAT target keeps…" language: en source: https://cubepath.com/security/cve/CVE-2026-53266 --- # CVE-2026-53266: netfilter: bridge: make ebt_snat ARP… | CubePath ## Description 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(). Official description from the CVE record, published by Linux. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-53266) ## Key data ### CVSS 3.1 High 8.8 Score published by Linux in the CVE record. CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H | Metric | Value | What it means | | ---------------------- | ------- | ----------------------------------------------------------------------------------------- | | Attack vector | Local | The attacker needs local access to the system, or to trick a user into running something. | | Attack complexity | Low | No special conditions are needed. The attack can be repeated at will. | | Privileges required | Low | A basic user account is needed. | | User interaction | None | No action from any user is needed. | | Scope | Changed | The impact can reach other components beyond the vulnerable one. | | Confidentiality impact | High | Serious or total effect on the secrecy of data. | | Integrity impact | High | Serious or total effect on the trustworthiness of data. | | Availability impact | High | Serious or total effect on availability. | CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) . ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.00934 (0.9% probability) Percentile 61.1% Scores of Nov 10, 2026 Model v2026.06.15 ### CISA Known Exploited Vulnerabilities This CVE is listed in the CISA KEV catalog. Name in the catalog Linux Kernel Out-of-Bounds Write Vulnerability Added to the catalog Sep 18, 2026 Federal due date Sep 21, 2026 ### CISA assessment as of Sep 18, 2026 Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA. Exploitation Recorded by CISA as active Automatable no Technical impact total ### Weakness (CWE) CWE catalog version 5.0. CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license. - [CWE-787](https://cwe.mitre.org/data/definitions/787.html) Out-of-bounds Write ## Affected products Products listed in the CVE record, as the CNA published them. - Linux - affected: 63137bc5882a1882c553d389fdeeeace86ee1741 up to before bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87 - affected: 63137bc5882a1882c553d389fdeeeace86ee1741 up to before 76280b78cc9f23bdc6438e10ad6dff148ef8375b - affected: 63137bc5882a1882c553d389fdeeeace86ee1741 up to before b7e91939ba9be805a62a257fa4e227dffbb88fa0 - affected: 63137bc5882a1882c553d389fdeeeace86ee1741 up to before afd64b59c3de9bbbdd3759e834fdc55cda716e0b - affected: 63137bc5882a1882c553d389fdeeeace86ee1741 up to before 153ea96c806aea395daba907a4f88480b6ad5093 - affected: 63137bc5882a1882c553d389fdeeeace86ee1741 up to before b18675263db1147c8e1cab625400c13a0d87bd2d - affected: 63137bc5882a1882c553d389fdeeeace86ee1741 up to before c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5 - affected: 63137bc5882a1882c553d389fdeeeace86ee1741 up to before 67ba971ae02514d85818fe0c32549ab4bfa3bf49 - affected: 2f3839075a5f8dcf116c1abe35b36b018ac62445 - affected: 51ba2945a8ef65ae437c8f9ba05f0343aa82ae5b - affected: b7d23c2c87584eb429f115c078ed511be8b18e29 - affected: 5.4.73 up to before 5.5 - affected: 5.8.17 up to before 5.9 - affected: 5.9.2 up to before 5.10 - Linux - affected: 5.10 - unaffected: before 5.10 - unaffected: 5.10.259 up to 5.10.\* - unaffected: 5.15.210 up to 5.15.\* - unaffected: 6.1.176 up to 6.1.\* - unaffected: 6.6.143 up to 6.6.\* - unaffected: 6.12.94 up to 6.12.\* - unaffected: 6.18.36 up to 6.18.\* - unaffected: 7.0.13 up to 7.0.\* - unaffected: 7.1 up to \* ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159…](https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87) - [git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef…](https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b) - [git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb…](https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0) - [git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda7…](https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b) - [git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6a…](https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093) - [git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d8…](https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d) - [git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8…](https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5) - [git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa…](https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49) ## Timeline 1. ID reserved Jun 9, 2026 2. Record published Jun 25, 2026 3. Added to CISA KEV Sep 18, 2026 4. Record last updated Sep 19, 2026 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:06 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)