Local privilege escalation via stale io_uring identity
Published Jan 30, 2023 · Updated Aug 2, 2024
Use-after-free in io_uring in Linux Kernel 5.10 through 5.10.161 allows local users to escalate privileges through crafted requests. io_prep_async_work wrongly assumes a final io_grab_identity call cannot fail, then reuses init_cred or a linked request's identity and mismanages references. Low-privileged local access is required, and successful exploitation elevates privileges in the kernel context.
Summary
What happened
Use-after-free in io_uring in Linux Kernel 5.10 through 5.10.161 allows local users to escalate privileges through crafted requests. io_prep_async_work wrongly assumes a final io_grab_identity call cannot fail, then reuses init_cred or a linked request's identity and mismanages references. Low-privileged local access is required, and successful exploitation elevates privileges in the kernel context.
The record
- CVE
- CVE-2023-0240
- Published
- Jan 30, 2023
- Updated
- Aug 2, 2024
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-416, CAPEC-233, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 30, 2023CVE publishedPublication date reported by the CVE source.
- Aug 2, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=5.10 <=5.10.161
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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