{"answers":{"affected":"It affects 1 product.","exploited":"Yes. Attackers have exploited CVE-2026-53266 in the wild since at least 18 Sep 2026.","fix":"Apply the vendor's patch. US federal agencies must fix it by 21 Sep 2026.","what":"CVE-2026-53266 is a high-severity memory corruption vulnerability in Linux kernel, published on 25 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-53266 and fix it if it is affected.\n\nWhat it is: CVE-2026-53266 is a high-severity memory corruption vulnerability in Linux kernel, published on 25 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: Yes. Attackers have exploited CVE-2026-53266 in the wild since at least 18 Sep 2026.\n\nAffected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-53266/ (Markdown: https://insights.sbomify.com/CVE-2026-53266/index.md)","id":"CVE-2026-53266","markdown":"https://insights.sbomify.com/CVE-2026-53266/index.md","name":"CVE-2026-53266","record":{"aliases":["AZL-90563","BELL-CVE-2026-53266","DEBIAN-CVE-2026-53266","GHSA-xmhg-rr34-2chj","RHSA-2026:70797","RHSA-2026:71325","RHSA-2026:73732","ROOT-OS-DEBIAN-11-CVE-2026-53266","ROOT-OS-DEBIAN-12-CVE-2026-53266","ROOT-OS-UBUNTU-2204-CVE-2026-53266","ROOT-OS-UBUNTU-2404-CVE-2026-53266","UBUNTU-CVE-2026-53266"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution","privilege_escalation"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A memory corruption vulnerability in the Linux kernel's ebtables SNAT target allows attackers to write to read-only memory, potentially leading to code execution or privilege escalation.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":8.8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"}],"description":"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().","ecosystems":["Red Hat:rhel_aus:8.6::baseos","Red Hat:rhel_e4s:8.8::baseos","Red Hat:rhel_els:6","Red Hat:rhel_eus_long_life:8.6::baseos","Red Hat:rhel_tus:8.8::baseos"],"exploits":{"exploitdb":0,"first_seen":"2026-09-20","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-09-20T06:03:40Z","kind":"github_poc","ref":"https://github.com/suominen/CVE-2026-53266","stars":0,"title":"Tracking CVE-2026-53266, the Linux kernel ebtables SNAT ARP-rewrite page-cache write"}],"tier":"exploited"},"has_fix":true,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","indexable":true,"kev":{"dateAdded":"2026-09-18","dueDate":"2026-09-21","knownRansomwareCampaignUse":"Unknown","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.","vendorProject":"Linux","vulnerabilityName":"Linux Kernel Out-of-Bounds Write Vulnerability"},"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"memory_corruption","year":"2026"},"n_packages":125,"n_references":8,"next":{"headline":"netfilter: nft_ct: bail out on template ct in get eval","id":"CVE-2026-53267"},"packages":[{"ecosystem":"Red Hat:rhel_aus:8.6::baseos","fixed":["0:4.18.0-372.217.1.el8_6"],"introduced":["0"],"last_affected":[],"package":"bpftool","purl":"pkg:rpm/redhat/bpftool","source":"RHSA-2026:70797"},{"ecosystem":"Red Hat:rhel_aus:8.6::baseos","fixed":["0:4.18.0-372.217.1.el8_6"],"introduced":["0"],"last_affected":[],"package":"bpftool-debuginfo","purl":"pkg:rpm/redhat/bpftool-debuginfo","source":"RHSA-2026:70797"},{"ecosystem":"Red Hat:rhel_aus:8.6::baseos","fixed":["0:4.18.0-372.217.1.el8_6"],"introduced":["0"],"last_affected":[],"package":"kernel","purl":"pkg:rpm/redhat/kernel","source":"RHSA-2026:70797"},{"ecosystem":"Red Hat:rhel_aus:8.6::baseos","fixed":["0:4.18.0-372.217.1.el8_6"],"introduced":["0"],"last_affected":[],"package":"kernel-abi-stablelists","purl":"pkg:rpm/redhat/kernel-abi-stablelists","source":"RHSA-2026:70797"},{"ecosystem":"Red Hat:rhel_aus:8.6::baseos","fixed":["0:4.18.0-372.217.1.el8_6"],"introduced":["0"],"last_affected":[],"package":"kernel-core","purl":"pkg:rpm/redhat/kernel-core","source":"RHSA-2026:70797"},{"ecosystem":"Red Hat:rhel_aus:8.6::baseos","fixed":["0:4.18.0-372.217.1.el8_6"],"introduced":["0"],"last_affected":[],"package":"kernel-debug","purl":"pkg:rpm/redhat/kernel-debug","source":"RHSA-2026:70797"},{"ecosystem":"Red Hat:rhel_aus:8.6::baseos","fixed":["0:4.18.0-372.217.1.el8_6"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-core","purl":"pkg:rpm/redhat/kernel-debug-core","source":"RHSA-2026:70797"},{"ecosystem":"Red Hat:rhel_aus:8.6::baseos","fixed":["0:4.18.0-372.217.1.el8_6"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-debuginfo","purl":"pkg:rpm/redhat/kernel-debug-debuginfo","source":"RHSA-2026:70797"},{"ecosystem":"Red Hat:rhel_aus:8.6::baseos","fixed":["0:4.18.0-372.217.1.el8_6"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-devel","purl":"pkg:rpm/redhat/kernel-debug-devel","source":"RHSA-2026:70797"},{"ecosystem":"Red Hat:rhel_aus:8.6::baseos","fixed":["0:4.18.0-372.217.1.el8_6"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-modules","purl":"pkg:rpm/redhat/kernel-debug-modules","source":"RHSA-2026:70797"},{"ecosystem":"Red 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Hat:rhel_aus:8.6::baseos","fixed":["0:4.18.0-372.217.1.el8_6"],"introduced":["0"],"last_affected":[],"package":"kernel-tools-debuginfo","purl":"pkg:rpm/redhat/kernel-tools-debuginfo","source":"RHSA-2026:70797"},{"ecosystem":"Red Hat:rhel_aus:8.6::baseos","fixed":["0:4.18.0-372.217.1.el8_6"],"introduced":["0"],"last_affected":[],"package":"kernel-tools-libs","purl":"pkg:rpm/redhat/kernel-tools-libs","source":"RHSA-2026:70797"},{"ecosystem":"Red Hat:rhel_aus:8.6::baseos","fixed":["0:4.18.0-372.217.1.el8_6"],"introduced":["0"],"last_affected":[],"package":"perf","purl":"pkg:rpm/redhat/perf","source":"RHSA-2026:70797"},{"ecosystem":"Red Hat:rhel_aus:8.6::baseos","fixed":["0:4.18.0-372.217.1.el8_6"],"introduced":["0"],"last_affected":[],"package":"perf-debuginfo","purl":"pkg:rpm/redhat/perf-debuginfo","source":"RHSA-2026:70797"},{"ecosystem":"Red Hat:rhel_aus:8.6::baseos","fixed":["0:4.18.0-372.217.1.el8_6"],"introduced":["0"],"last_affected":[],"package":"python3-perf","purl":"pkg:rpm/redhat/python3-perf","source":"RHSA-2026:70797"},{"ecosystem":"Red Hat:rhel_aus:8.6::baseos","fixed":["0:4.18.0-372.217.1.el8_6"],"introduced":["0"],"last_affected":[],"package":"python3-perf-debuginfo","purl":"pkg:rpm/redhat/python3-perf-debuginfo","source":"RHSA-2026:70797"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.169.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"bpftool","purl":"pkg:rpm/redhat/bpftool","source":"RHSA-2026:71325"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.169.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"bpftool-debuginfo","purl":"pkg:rpm/redhat/bpftool-debuginfo","source":"RHSA-2026:71325"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.169.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel","purl":"pkg:rpm/redhat/kernel","source":"RHSA-2026:71325"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.169.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-abi-stablelists","purl":"pkg:rpm/redhat/kernel-abi-stablelists","source":"RHSA-2026:71325"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.169.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-core","purl":"pkg:rpm/redhat/kernel-core","source":"RHSA-2026:71325"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.169.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debug","purl":"pkg:rpm/redhat/kernel-debug","source":"RHSA-2026:71325"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.169.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-core","purl":"pkg:rpm/redhat/kernel-debug-core","source":"RHSA-2026:71325"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.169.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-debuginfo","purl":"pkg:rpm/redhat/kernel-debug-debuginfo","source":"RHSA-2026:71325"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.169.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-devel","purl":"pkg:rpm/redhat/kernel-debug-devel","source":"RHSA-2026:71325"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.169.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-modules","purl":"pkg:rpm/redhat/kernel-debug-modules","source":"RHSA-2026:71325"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.169.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-modules-extra","purl":"pkg:rpm/redhat/kernel-debug-modules-extra","source":"RHSA-2026:71325"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.169.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debuginfo","purl":"pkg:rpm/redhat/kernel-debuginfo","source":"RHSA-2026:71325"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.169.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debuginfo-common-ppc64le","purl":"pkg:rpm/redhat/kernel-debuginfo-common-ppc64le","source":"RHSA-2026:71325"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.169.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-debuginfo-common-x86_64","purl":"pkg:rpm/redhat/kernel-debuginfo-common-x86_64","source":"RHSA-2026:71325"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.169.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-devel","purl":"pkg:rpm/redhat/kernel-devel","source":"RHSA-2026:71325"},{"ecosystem":"Red Hat:rhel_e4s:8.8::baseos","fixed":["0:4.18.0-477.169.1.el8_8"],"introduced":["0"],"last_affected":[],"package":"kernel-doc","purl":"pkg:rpm/redhat/kernel-doc","source":"RHSA-2026:71325"}],"prev":{"headline":"dm cache policy smq: check allocation under invalidate lock","id":"CVE-2026-53265"},"products":["Linux"],"published":"2026-06-25","related":[{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"open","licence":"CC0 1.0","name":"CISA KEV"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"active","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-19","vendors":["Linux"]},"summary":"A memory corruption vulnerability in the Linux kernel's ebtables SNAT target allows attackers to write to read-only memory, potentially leading to code execution or privilege escalation.","url":"https://insights.sbomify.com/CVE-2026-53266/"}