Local privilege escalation via oversized packet address copy
Published Aug 11, 2022 · Updated Aug 3, 2024
Out-of-bounds access in packet_recvmsg in Linux Kernel before 5.17 allows local users to escalate privileges through an AF_PACKET socket. With PACKET_COPY_THRESH and mmap active, tpacket_rcv queues a copied packet whose address metadata contains garbage, and packet_recvmsg trusts that metadata as the copy length. Exploitation requires access to create and operate the packet socket; the oversized copy can overwrite the kernel stack without user interaction.
Summary
What happened
Out-of-bounds access in packet_recvmsg in Linux Kernel before 5.17 allows local users to escalate privileges through an AF_PACKET socket. With PACKET_COPY_THRESH and mmap active, tpacket_rcv queues a copied packet whose address metadata contains garbage, and packet_recvmsg trusts that metadata as the copy length. Exploitation requires access to create and operate the packet socket; the oversized copy can overwrite the kernel stack without user interaction.
The record
- CVE
- CVE-2022-20368
- Published
- Aug 11, 2022
- Updated
- Aug 3, 2024
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 11, 2022CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=Android kernel
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Published CVSS scores
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Attacks
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Your stack
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