CVE detail
CVE-2026-53266: Linux Kernel Out-of-Bounds Write Vulnerability
Source: CISA Known Exploited Vulnerabilities catalog · back to feed
Vendor / product
Linux · Kernel
- Date added (KEV)
- Sep 18, 2026
- CISA due date
- Sep 21, 2026
- Ransomware campaign use
- Unknown
Required action
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.
Vendor fix: Vendor patch
Scorifya interpretation
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Plain English
Technical detail
From CISA
Linux Kernel contains an out-of-bounds write vulnerability in the ebtables SNAT target which allows an ARP sender hardware address rewrite to write directly into a nonlinear socket-buffer fragment backed by a splice-imported file page. The impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.
This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: ; https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87; https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375b; https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0; https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0b; https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093; https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2d; https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5; https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-53266
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See Scorifya Controls →References
- https://git.kernel.org/stable/c/153ea96c806aea395daba907a4f88480b6ad5093Patch
- https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49Patch
- https://git.kernel.org/stable/c/76280b78cc9f23bdc6438e10ad6dff148ef8375bPatch
- https://git.kernel.org/stable/c/afd64b59c3de9bbbdd3759e834fdc55cda716e0bPatch
- https://git.kernel.org/stable/c/b18675263db1147c8e1cab625400c13a0d87bd2dPatch
- https://git.kernel.org/stable/c/b7e91939ba9be805a62a257fa4e227dffbb88fa0Patch
- https://git.kernel.org/stable/c/bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87Patch
- https://git.kernel.org/stable/c/c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5Patch
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-53266US Government Resource
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