In the Linux kernel, the following vulnerability has been resolved:
misc: sgi-gru: remove interrupt-context page-table walks
The GRU TLB miss handler walks a process's page tables without holding
page-table locks or a reference to the mapped page. It also uses a kernel
page-table accessor on user page tables and supports only PMD-level large
mappings on x86-64. Remove the direct walker.
Send interrupt faults directly to user polling
mode so the existing call-OS fallback retries them in process context. Remove the mmap-lock failure statistic that can no longer be incremented.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
References 4
https://git.kernel.org/stable/c/6248eb1833ff0adfdbbadd5f846c2f22e02a01b0
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/877423f595b60f8fe7c18b64a5d283d9e1732a13
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/928a8e9f523df845fc496bcb9811013b67aabec5
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/ef81e4a1628ecfb9cfc442de10883f383faf17a1
416baaa9-dc9f-4396-8d5f-8c081fb06d67