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high8.8Known exploited

CVE-2026-53266

Linux Kernel Out-of-Bounds Write Vulnerability

Exploited in the wild

This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2026-09-18. Federal due date: 2026-09-21.

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.

Impact

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.

Affected products

VendorProductAffected versions
LinuxLinux
from 63137bc5882a1882c553d389fdeeeace86ee1741 before afd64b59c3de9bbbdd3759e834fdc55cda716e0b
from 5.4.73 before 5.5
from 63137bc5882a1882c553d389fdeeeace86ee1741 before 67ba971ae02514d85818fe0c32549ab4bfa3bf49
from 5.9.2 before 5.10
Versions patch: 0, b7d23c2c87584eb429f115c078ed511be8b18e29
LinuxLinux Kernel
from 5.4.73 before 5.5
from 5.8.17 before 5.9
from 5.9.2 before 5.10.259
from 5.11 before 5.15.210
from 5.16 before 6.1.176
from 6.2 before 6.6.143

Weakness classification

CWE-787

References