Kernel memory corruption and disclosure via undersized buffer
Published Dec 27, 2024 · Updated Aug 5, 2026
Out-of-bounds access in the Linux kernel ACPI NFIT subsystem allows local users to disclose or corrupt kernel memory through an ioctl. Attacker-controlled size fields produce an undersized vmalloc buffer, and cmd_to_func reads nd_reserved2 before validating call_pkg as a complete nd_cmd_pkg structure. Reachability requires write access to /dev/ndctl%d or /dev/nmem%d; exploitation can disclose or corrupt kernel memory and trigger an oops or panic.
Summary
What happened
Out-of-bounds access in the Linux kernel ACPI NFIT subsystem allows local users to disclose or corrupt kernel memory through an ioctl. Attacker-controlled size fields produce an undersized vmalloc buffer, and cmd_to_func reads nd_reserved2 before validating call_pkg as a complete nd_cmd_pkg structure. Reachability requires write access to /dev/ndctl%d or /dev/nmem%d; exploitation can disclose or corrupt kernel memory and trigger an oops or panic.
The record
- CVE
- CVE-2024-56662
- Published
- Dec 27, 2024
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 27, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0c79794474895dbbc3c52225f7e9f73cfecbb7dd
- Affected versionversion=4.14.176 <4.15
- Affected versionversion=4.19.31 <4.20
- Affected versionversion=5.0.4 <5.1
- Affected versionversion=5.1
- Affected versionversion=63108f2a408abea7ecab063efa0f398da4d0d14b
- Affected versionversion=ebe9f6f19d80d8978d16078dff3d5bd93ad8d102 <143f723e9eb4f0302ffb7adfdc7ef77eab3f68e0
- Affected versionversion=ebe9f6f19d80d8978d16078dff3d5bd93ad8d102 <212846fafb753a48e869e2a342fc1e24048da771
- Affected versionversion=ebe9f6f19d80d8978d16078dff3d5bd93ad8d102 <265e98f72bac6c41a4492d3e30a8e5fd22fe0779
- Affected versionversion=ebe9f6f19d80d8978d16078dff3d5bd93ad8d102 <616aa5f3c86e0479bcbb81e41c08c43ff32af637
- Affected versionversion=ebe9f6f19d80d8978d16078dff3d5bd93ad8d102 <bbdb3307f609ec4dc9558770f464ede01fe52aed
- Affected versionversion=ebe9f6f19d80d8978d16078dff3d5bd93ad8d102 <e08dc2dc3c3f7938df0e4476fe3e6fdec5583c1d
- Affected versionversion=f5878c4f084dc6b1386dad03970bb61ad5e9dc4b
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
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Public exploit references
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Technologies
Your stack
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Your stack
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