Local privilege escalation via FASTRPC map race
Published Aug 21, 2024 · Updated Aug 5, 2026
Use-after-free in the FASTRPC driver in Linux allows local users to escalate privileges through concurrent device ioctls. fastrpc_map_lookup releases its mutex before fastrpc_map_find increments the selected map reference, allowing another thread to free the map first. Exploitation requires access to a FASTRPC device node and concurrent ioctl calls; successful reuse enables kernel-memory disclosure, modification, or a kernel crash.
Summary
What happened
Use-after-free in the FASTRPC driver in Linux allows local users to escalate privileges through concurrent device ioctls. fastrpc_map_lookup releases its mutex before fastrpc_map_find increments the selected map reference, allowing another thread to free the map first. Exploitation requires access to a FASTRPC device node and concurrent ioctl calls; successful reuse enables kernel-memory disclosure, modification, or a kernel crash.
The record
- CVE
- CVE-2022-48874
- Published
- Aug 21, 2024
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1068
- Attack vector
- local
- Privileges
- authenticated
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
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- Affected versionversion=5.18
- Affected versionversion=8f6c1d8c4f0cc316b0456788fff8373554d1d99d <9446fa1683a7e3937d9970248ced427c1983a1c5
- Affected versionversion=8f6c1d8c4f0cc316b0456788fff8373554d1d99d <a50c5c25b6e7d2824698c0e6385f882a18f4a498
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What is affected?
Published CVSS scores
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Attacks
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Technologies
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