Kernel memory corruption via undersized RX buffer
Published Aug 21, 2024 · Updated Aug 5, 2026
Out-of-bounds access in the Linux Qualcomm GENI serial driver allows attackers to corrupt kernel memory during UART receive. Probe allocates the RX FIFO for the default depth, but startup can increase rx_fifo_depth without resizing the buffer, so handle_rx_uart writes excess words past the allocation. Reachability requires a Qualcomm Bluetooth HCI UART configuration whose actual FIFO is deeper than the default; the observed result is a KASAN-detected kernel memory overwrite.
Summary
What happened
Out-of-bounds access in the Linux Qualcomm GENI serial driver allows attackers to corrupt kernel memory during UART receive. Probe allocates the RX FIFO for the default depth, but startup can increase rx_fifo_depth without resizing the buffer, so handle_rx_uart writes excess words past the allocation. Reachability requires a Qualcomm Bluetooth HCI UART configuration whose actual FIFO is deeper than the default; the observed result is a KASAN-detected kernel memory overwrite.
The record
- CVE
- CVE-2022-48871
- Published
- Aug 21, 2024
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-125
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 21, 2024CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=5.7
- Affected versionversion=f9d690b6ece7ec9a6ff6b588df95a010ab2d66f9 <894681682dbefdad917b88f86cde1069140a047a
- Affected versionversion=f9d690b6ece7ec9a6ff6b588df95a010ab2d66f9 <b8caf69a6946e18ffebad49847e258f5b6d52ac2
- Affected versionversion=f9d690b6ece7ec9a6ff6b588df95a010ab2d66f9 <cb53a3366eb28fed67850c80afa52075bb71a38a
- Affected versionversion=f9d690b6ece7ec9a6ff6b588df95a010ab2d66f9 <fd524ca7fe45b8a06dca2dd546d62684a9768f95
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo