Local kernel deadlock via recursive trace snapshots
Published Feb 18, 2026 · Updated Feb 18, 2026
Improper locking in Linux Kernel allows local users to deadlock RISC-V systems by configuring an SBI ecall trace snapshot. The __sbi_ecall trace callback snapshots the ring buffer, raises an IPI that re-enters __sbi_ecall, and repeats without termination. Exposure requires RISC-V function tracing with SBI ecall functions traceable; systems without SSTC generate periodic ecalls that readily initiate the loop.
Summary
What happened
Improper locking in Linux Kernel allows local users to deadlock RISC-V systems by configuring an SBI ecall trace snapshot. The __sbi_ecall trace callback snapshots the ring buffer, raises an IPI that re-enters __sbi_ecall, and repeats without termination. Exposure requires RISC-V function tracing with SBI ecall functions traceable; systems without SSTC generate periodic ecalls that readily initiate the loop.
The record
- CVE
- CVE-2026-23217
- Published
- Feb 18, 2026
- Updated
- Feb 18, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-667, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 18, 2026CVE publishedPublication date reported by the CVE source.
- Feb 18, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Is a vulnerable build present?
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- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b0d7f5f0c9f05f1b6d4ee7110f15bef9c11f9df0
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b1f8285bc8e3508c1fde23b5205f1270215d4984
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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