Kernel-memory disclosure via mismatched multipath route deletion
Published Oct 8, 2022 · Updated Apr 15, 2025
An out-of-bounds read in Linux Kernel IPv4 routing allows remote authenticated users to expose kernel memory during route deletion. The fib_nh_match function treats a legacy multipath deletion specification as compatible with fib_info that instead references a separate nexthop object, then reads beyond the matching nexthop data. Reaching the flaw requires authenticated authority to delete an IPv4 route in that mismatched state; the bounded consequence is kernel-memory disclosure.
Summary
What happened
An out-of-bounds read in Linux Kernel IPv4 routing allows remote authenticated users to expose kernel memory during route deletion. The fib_nh_match function treats a legacy multipath deletion specification as compatible with fib_info that instead references a separate nexthop object, then reads beyond the matching nexthop data. Reaching the flaw requires authenticated authority to delete an IPv4 route in that mismatched state; the bounded consequence is kernel-memory disclosure.
The record
- CVE
- CVE-2022-3435
- Published
- Oct 8, 2022
- Updated
- Apr 15, 2025
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-119
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 8, 2022CVE publishedPublication date reported by the CVE source.
- Apr 15, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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- Affected versionversion=n/a
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Your stack
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