CVE-2026-53076bpf: Fix OOB in pcpu_init_value
Updated under an hour ago ()
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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.
- CVSS
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from d3bec0138bfbe58606fc1d6f57a4cdc1a20218db before e19c5ed9f1922a6854073f8651a63fa7be26e9e9; from d3bec0138bfbe58606fc1d6f57a4cdc1a20218db before e0378419b0e20178b5d100b27c9cc7e51064202e; from d3bec0138bfbe58606fc1d6f57a4cdc1a20218db before 6086079e6d1c32ba4c4b422612b8aebb1129a96c; from d3bec0138bfbe58606fc1d6f57a4cdc1a20218db before 634a793d0e1c822412095d25a1338f8831ad894c; from d3bec0138bfbe58606fc1d6f57a4cdc1a20218db before 576afddfee8d1108ee299bf10f581593540d1a36; c602ad2b52dcbca5af08e5137bd5575c039b52e3; ab68b940dd6f7b5f8e2557937162dcb8a0583a05; from 5.4.78 before 5.5; and 1 more ranges | CNA record |
linux linux_kernel linux:linux_kernel | from 5.4.78 before 5.5; from 5.9.9 before 5.10; from 5.10.1 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10; 5.10; 5.10; and 3 more ranges | NVD |
References
- https://git.kernel.org/stable/c/e19c5ed9f1922a6854073f8651a63fa7be26e9e9patch
- https://git.kernel.org/stable/c/e0378419b0e20178b5d100b27c9cc7e51064202epatch
- https://git.kernel.org/stable/c/6086079e6d1c32ba4c4b422612b8aebb1129a96cpatch
- https://git.kernel.org/stable/c/634a793d0e1c822412095d25a1338f8831ad894cpatch
- https://git.kernel.org/stable/c/576afddfee8d1108ee299bf10f581593540d1a36patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.