Root escalation via dangling nftables set binding
Published Jun 2, 2022 · Updated Aug 3, 2024
Use-after-free in Linux kernel 5.18.1 and earlier allows local users to escalate privileges to root through crafted nftables set expressions. When NFT_MSG_NEWSET supplies a non-stateful lookup or dynset subexpression, nf_tables destroys the expression without first removing its set-binding list entry. A local user who can create user and network namespaces can later reuse the dangling binding to write into freed kernel slab memory and gain root access.
Summary
What happened
Use-after-free in Linux kernel 5.18.1 and earlier allows local users to escalate privileges to root through crafted nftables set expressions. When NFT_MSG_NEWSET supplies a non-stateful lookup or dynset subexpression, nf_tables destroys the expression without first removing its set-binding list entry. A local user who can create user and network namespaces can later reuse the dangling binding to write into freed kernel slab memory and gain root access.
The record
- CVE
- CVE-2022-32250
- Published
- Jun 2, 2022
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-416, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 2, 2022CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
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Public exploit references
- CVE-2022-32250 Linux Kernel LPEfunctional · demonstrated
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Technologies
Your stack
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Your stack
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