CVE-2026-79979 Linux Kernel - Broken Access Control

The arm64 MMU backend in Linux kernel with CONFIG_USERSPACE and CONFIG_DEMAND_PAGING enabled contains a memory isolation bypass caused by improper TLB invalidation that only targets ASID 0, letting unprivileged user threads access stale mappings of kernel or other domain memory, exploit requires demand-paged pages privately mapped into a user memory domain.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.14% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Information Disclosure, Data Tampering, Privilege Escalation
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
23 October 2026
Updated
25 October 2026
Weakness
CWE-416

Vendor fix

Update to a kernel version that includes the fix switching to TLBI VAAE1{IS} for proper TLB invalidation.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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