Kernel-memory disclosure via rounded per-CPU map copy
Published Jun 24, 2026 · Updated Jun 24, 2026
Out-of-bounds read in the Linux kernel BPF subsystem allows local users to disclose kernel memory through a crafted per-CPU map update. pcpu_init_value rounds a non-8-byte-aligned source length up to eight bytes, then copy_map_value_long reads beyond the CGROUP_STORAGE value into per-CPU map padding. Reachability requires local BPF activity and either unprivileged BPF support or BPF-related capabilities; repeated lookups expose kernel memory, and the read can trigger an oops or panic.
Summary
What happened
Out-of-bounds read in the Linux kernel BPF subsystem allows local users to disclose kernel memory through a crafted per-CPU map update. pcpu_init_value rounds a non-8-byte-aligned source length up to eight bytes, then copy_map_value_long reads beyond the CGROUP_STORAGE value into per-CPU map padding. Reachability requires local BPF activity and either unprivileged BPF support or BPF-related capabilities; repeated lookups expose kernel memory, and the read can trigger an oops or panic.
The record
- CVE
- CVE-2026-53076
- Published
- Jun 24, 2026
- Updated
- Jun 24, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-125, T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 24, 2026CVE publishedPublication date reported by the CVE source.
- Jun 24, 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=5.10
- Affected versionversion=5.4.78 <5.5
- Affected versionversion=5.9.9 <5.10
- Affected versionversion=ab68b940dd6f7b5f8e2557937162dcb8a0583a05
- Affected versionversion=c602ad2b52dcbca5af08e5137bd5575c039b52e3
- Affected versionversion=d3bec0138bfbe58606fc1d6f57a4cdc1a20218db <576afddfee8d1108ee299bf10f581593540d1a36
- Affected versionversion=d3bec0138bfbe58606fc1d6f57a4cdc1a20218db <6086079e6d1c32ba4c4b422612b8aebb1129a96c
- Affected versionversion=d3bec0138bfbe58606fc1d6f57a4cdc1a20218db <634a793d0e1c822412095d25a1338f8831ad894c
- Affected versionversion=d3bec0138bfbe58606fc1d6f57a4cdc1a20218db <e0378419b0e20178b5d100b27c9cc7e51064202e
- Affected versionversion=d3bec0138bfbe58606fc1d6f57a4cdc1a20218db <e19c5ed9f1922a6854073f8651a63fa7be26e9e9
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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Public exploit references
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Technologies
Your stack
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Your stack
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