CVE-2026-53076 (GCVE-0-2026-53076)
Vulnerability from cvelistv5
Published
2026-06-24 16:30
Modified
2026-10-19 19:47
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix OOB in pcpu_init_value An out-of-bounds read occurs when copying element from a BPF_MAP_TYPE_CGROUP_STORAGE map to another pcpu map with the same value_size that is not rounded up to 8 bytes. The issue happens when: 1. A CGROUP_STORAGE map is created with value_size not aligned to 8 bytes (e.g., 4 bytes) 2. A pcpu map is created with the same value_size (e.g., 4 bytes) 3. Update element in 2 with data in 1 pcpu_init_value assumes that all sources are rounded up to 8 bytes, and invokes copy_map_value_long to make a data copy, However, the assumption doesn't stand since there are some cases where the source may not be rounded up to 8 bytes, e.g., CGROUP_STORAGE, skb->data. the verifier verifies exactly the size that the source claims, not the size rounded up to 8 bytes by kernel, an OOB happens when the source has only 4 bytes while the copy size(4) is rounded up to 8.
References
Impacted products
Vendor Product Version
Linux Linux Version: d3bec0138bfbe58606fc1d6f57a4cdc1a20218db
Version: d3bec0138bfbe58606fc1d6f57a4cdc1a20218db
Version: d3bec0138bfbe58606fc1d6f57a4cdc1a20218db
Version: d3bec0138bfbe58606fc1d6f57a4cdc1a20218db
Version: d3bec0138bfbe58606fc1d6f57a4cdc1a20218db
Version: c602ad2b52dcbca5af08e5137bd5575c039b52e3
Version: ab68b940dd6f7b5f8e2557937162dcb8a0583a05
Version: 5.4.78   ≤
Version: 5.9.9   ≤
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