{"id":"CVE-2026-53076","title":"bpf: Fix OOB in pcpu_init_value","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix OOB in pcpu_init_value\n\nAn out-of-bounds read occurs when copying element from a\nBPF_MAP_TYPE_CGROUP_STORAGE map to another pcpu map with the\nsame value_size t…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= d3bec0138bfbe58606fc1d6f57a4cdc1a20218db < e19c5ed9f1922a6854073f8651a63fa7be26e9e9","Linux >= d3bec0138bfbe58606fc1d6f57a4cdc1a20218db < e0378419b0e20178b5d100b27c9cc7e51064202e","Linux >= d3bec0138bfbe58606fc1d6f57a4cdc1a20218db < 6086079e6d1c32ba4c4b422612b8aebb1129a96c","Linux >= d3bec0138bfbe58606fc1d6f57a4cdc1a20218db < 634a793d0e1c822412095d25a1338f8831ad894c","Linux >= d3bec0138bfbe58606fc1d6f57a4cdc1a20218db < 576afddfee8d1108ee299bf10f581593540d1a36","Linux c602ad2b52dcbca5af08e5137bd5575c039b52e3","Linux ab68b940dd6f7b5f8e2557937162dcb8a0583a05","Linux >= 5.4.78 < 5.5","Linux >= 5.9.9 < 5.10","Linux 5.10"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-16T15:25:17.354262Z"},"published":"2026-06-24","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:31:31.024Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53076","references":[{"url":"https://git.kernel.org/stable/c/e19c5ed9f1922a6854073f8651a63fa7be26e9e9"},{"url":"https://git.kernel.org/stable/c/e0378419b0e20178b5d100b27c9cc7e51064202e"},{"url":"https://git.kernel.org/stable/c/6086079e6d1c32ba4c4b422612b8aebb1129a96c"},{"url":"https://git.kernel.org/stable/c/634a793d0e1c822412095d25a1338f8831ad894c"},{"url":"https://git.kernel.org/stable/c/576afddfee8d1108ee299bf10f581593540d1a36"}],"tags":["cve.org"],"epss":0.00117,"epssPercentile":0.01533,"ingestedAt":"2026-10-16T17:24:46.729Z","slug":"CVE-2026-53076","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix OOB in pcpu_init_value\n\nAn out-of-bounds read occurs when copying element from a\nBPF_MAP_TYPE_CGROUP_STORAGE map to another pcpu map with the\nsame value_size that is not rounded up to 8 bytes.\n\nThe issue happens when:\n1. A CGROUP_STORAGE map is created with value_size not aligned to\n   8 bytes (e.g., 4 bytes)\n2. A pcpu map is created with the same value_size (e.g., 4 bytes)\n3. Update element in 2 with data in 1\n\npcpu_init_value assumes that all sources are rounded up to 8 bytes,\nand invokes copy_map_value_long to make a data copy, However, the\nassumption doesn't stand since there are some cases where the source\nmay not be rounded up to 8 bytes, e.g., CGROUP_STORAGE, skb->data.\nthe verifier verifies exactly the size that the source claims, not\nthe size rounded up to 8 bytes by kernel, an OOB happens when the\nsource has only 4 bytes while the copy size(4) is rounded up to 8.\n\n## Affected\n\n- `Linux >= d3bec0138bfbe58606fc1d6f57a4cdc1a20218db < e19c5ed9f1922a6854073f8651a63fa7be26e9e9`\n- `Linux >= d3bec0138bfbe58606fc1d6f57a4cdc1a20218db < e0378419b0e20178b5d100b27c9cc7e51064202e`\n- `Linux >= d3bec0138bfbe58606fc1d6f57a4cdc1a20218db < 6086079e6d1c32ba4c4b422612b8aebb1129a96c`\n- `Linux >= d3bec0138bfbe58606fc1d6f57a4cdc1a20218db < 634a793d0e1c822412095d25a1338f8831ad894c`\n- `Linux >= d3bec0138bfbe58606fc1d6f57a4cdc1a20218db < 576afddfee8d1108ee299bf10f581593540d1a36`\n- `Linux c602ad2b52dcbca5af08e5137bd5575c039b52e3`\n- `Linux ab68b940dd6f7b5f8e2557937162dcb8a0583a05`\n- `Linux >= 5.4.78 < 5.5`\n- `Linux >= 5.9.9 < 5.10`\n- `Linux 5.10`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}