Local privilege escalation via unchecked JFS group index
Published Aug 17, 2024 · Updated Aug 5, 2026
Array-index validation failure in Linux JFS allows local users to gain elevated privileges when deleting an inode on a mounted JFS volume. diRead trusts an allocation-group start from JFS metadata and derives a group index without checking it against MAXAG before later inode handling. A low-privileged local user who can exercise JFS inode deletion can drive diFree out of bounds, corrupting kernel memory and disrupting or compromising the host.
Summary
What happened
Array-index validation failure in Linux JFS allows local users to gain elevated privileges when deleting an inode on a mounted JFS volume. diRead trusts an allocation-group start from JFS metadata and derives a group index without checking it against MAXAG before later inode handling. A low-privileged local user who can exercise JFS inode deletion can drive diFree out of bounds, corrupting kernel memory and disrupting or compromising the host.
The record
- CVE
- CVE-2024-43858
- Published
- Aug 17, 2024
- Updated
- Aug 5, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Classifications
- CWE-129, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 17, 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
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Is a vulnerable build present?
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- Affected versionversion=0 <*
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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Weakness, pattern, technique
Public exploit references
- syzbot C reproducer for diFree out-of-bounds accessproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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