CVE-2026-82964: Avast sandbox privilege escalation via unpreserved DACLs on virtualized files in aswSnx.sys
Gen Digital · Avast Free Antivirus, Avast One, Avast Premium Security, Avast Ultimate, Avast…
Vendor fix available · Affected: Gen Digital Avast Free Antivirus, Avast One, Avast Premium Security, Avast Ultimate, Avast… · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 4% of scored CVEs
DescriptionCVE.org
Improper preservation of permissions in the Avast sandbox minifilter driver (aswSnx.sys) on Windows allows a local, low-privileged attacker executing inside the sandbox to escape file isolation and escalate to SYSTEM. When the sandbox virtualizes a file it copies the original security descriptor, but the driver opened the virtualization target object with GENERIC_WRITE and FILE_WRITE_ATTRIBUTES only, omitting WRITE_DAC. Every attempt to apply the original DACL therefore failed, and the failure was discarded silently, leaving virtualized copies of sensitive files with permissive permissions. Because the IRP_MJ_CREATE callback additionally did not strip WRITE_DAC for sensitive directories, a sandboxed process could rewrite the security descriptor of a virtualized object, read the virtualized copy of the SAM database, extract local NTLM password hashes and execute code as SYSTEM. The absence of an IRP_MJ_SET_SECURITY callback in the driver's operation registration table is a related defense-in-depth gap, but it is not the control that prevents this attack.
Affected products3
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Gen Digital · Avast Free Antivirus, Avast One, Avast Premium Security, Avast Ultimate, Avast Business Securitybefore 26.8
- Gen Digital · AVG Antivirus Free, AVG Internet Security, AVG Ultimatebefore 26.8
- Gen Digital · Norton Antivirus Plus, Norton 360 Standard, Norton 360 Deluxe, Norton 360 Advancedbefore 26.8
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Gen Digital
- Published
- September 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-82964 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.