{"id":"CVE-2026-53076","summary":"bpf: Fix OOB in pcpu_init_value","details":"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 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-\u003edata.\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.","modified":"2026-08-12T03:51:15.911302839Z","published":"2026-06-24T16:30:17.092Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53076.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/576afddfee8d1108ee299bf10f581593540d1a36"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6086079e6d1c32ba4c4b422612b8aebb1129a96c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/634a793d0e1c822412095d25a1338f8831ad894c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e0378419b0e20178b5d100b27c9cc7e51064202e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e19c5ed9f1922a6854073f8651a63fa7be26e9e9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53076.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53076"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d3bec0138bfbe58606fc1d6f57a4cdc1a20218db"},{"fixed":"e19c5ed9f1922a6854073f8651a63fa7be26e9e9"},{"fixed":"e0378419b0e20178b5d100b27c9cc7e51064202e"},{"fixed":"6086079e6d1c32ba4c4b422612b8aebb1129a96c"},{"fixed":"634a793d0e1c822412095d25a1338f8831ad894c"},{"fixed":"576afddfee8d1108ee299bf10f581593540d1a36"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"c602ad2b52dcbca5af08e5137bd5575c039b52e3"},{"last_affected":"ab68b940dd6f7b5f8e2557937162dcb8a0583a05"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.4.78"},{"fixed":"5.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.9.9"},{"fixed":"5.10"}]}],"versions":["v5.9","v5.9.8","v5.4.77","v5.9.7","v5.4.76","v5.9.6","v5.4.75","v5.9.5","v5.9.4","v5.4.74","v5.9.3","v5.9.2","v5.4.73","v5.9.1","v5.4.72","v5.9-rc1","v5.9-rc7","v5.4.71","v5.4.70","v5.9-rc8","v5.9-rc6","v5.9-rc4","v5.9-rc5","v5.4.69","v5.9-rc3","v5.4.68","v5.4.67","v5.9-rc2","v5.4.66","v5.4.65","v5.4.64","v5.4.63","v5.4.62","v5.8","v5.4.61","v5.4.60","v5.4.59","v5.4.58","v5.4.57","v5.4.56","v5.7","v5.8-rc2","v5.8-rc1","v5.8-rc7","v5.4.55","v5.8-rc5","v5.4.54","v5.8-rc3","v5.8-rc4","v5.4.53","v5.8-rc6","v5.4.52","v5.4.51","v5.4.50","v5.4.49","v5.7-rc4","v5.4.48","v5.4.47","v5.4.46","v5.4.45","v5.4.44","v5.7-rc7","v5.7-rc1","v5.4.43","v5.7-rc3","v5.7-rc2","v5.7-rc5","v5.4.42","v5.7-rc6","v5.4.41","v5.4.40","v5.6","v5.4.39","v5.4.38","v5.4.37","v5.4.36","v5.4.35","v5.4.34","v5.4.33","v5.4.32","v5.4.31","v5.4.30","v5.6-rc1","v5.4.29","v5.4.28","v5.6-rc7","v5.6-rc6","v5.6-rc3","v5.6-rc4","v5.6-rc2","v5.6-rc5","v5.4.27","v5.4.26","v5.4.25","v5.4.24","v5.4.23","v5.4.22","v5.4.21","v5.4.20","v5.4.19","v5.4.18","v5.5","v5.4.17","v5.5-rc5","v5.4.16","v5.5-rc7","v5.5-rc2","v5.5-rc1","v5.4.15","v5.4","v5.4.14","v5.5-rc4","v5.4.13","v5.5-rc3","v5.5-rc6","v5.4.12","v5.4.11","v5.4.10","v5.4.9","v5.4.8","v5.4.7","v5.4.6","v5.4.5","v5.4.4","v5.4.3","v5.4.2","v5.4-rc1","v5.4.1","v5.4-rc6","v5.4-rc3","v5.4-rc4","v5.4-rc8","v5.4-rc7","v5.4-rc5","v5.3","v5.4-rc2","v5.3-rc5","v5.3-rc1","v5.3-rc2","v5.3-rc3","v5.3-rc8","v5.3-rc7","v5.3-rc4","v5.2","v5.3-rc6","v5.2-rc2","v5.2-rc7","v5.2-rc4","v5.2-rc1","v5.2-rc5","v5.2-rc6","v5.2-rc3","v5.1","v5.0-rc8","v5.1-rc7","v5.1-rc1","v5.1-rc6","v5.1-rc5","v5.0","v5.1-rc3","v5.1-rc2","v5.1-rc4","v5.0-rc1","v5.0-rc4","v5.0-rc3","v5.0-rc6","v5.0-rc7","v5.0-rc2","v5.0-rc5","v4.20-rc1","v4.19","v4.20","v4.20-rc7","v4.20-rc5","v4.20-rc6","v4.20-rc4","v4.20-rc2","v4.20-rc3","v4.19-rc2","v4.19-rc8","v4.19-rc4","v4.19-rc1","v4.19-rc7","v4.19-rc6","v4.19-rc5","v4.19-rc3","v4.18","v4.18-rc1","v4.18-rc8","v4.18-rc2","v4.18-rc5","v4.18-rc6","v4.18-rc7","v4.17","v4.18-rc3","v4.18-rc4","v4.17-rc1","v4.17-rc2","v4.17-rc7","v4.17-rc3","v4.17-rc4","v4.16","v4.17-rc6","v4.17-rc5","v4.16-rc7","v4.16-rc4","v4.16-rc1","v4.16-rc2","v4.16-rc5","v4.16-rc3","v4.16-rc6","v4.14","v4.15","v4.15-rc1","v4.15-rc4","v4.15-rc9","v4.15-rc8","v4.15-rc7","v4.15-rc3","v4.15-rc2","v4.15-rc5","v4.15-rc6","v4.14-rc1","v4.14-rc7","v4.14-rc3","v4.13","v4.14-rc8","v4.14-rc4","v4.14-rc6","v4.14-rc2","v4.14-rc5","v4.13-rc2","v4.13-rc1","v4.13-rc3","v4.13-rc7","v4.13-rc4","v4.13-rc5","v4.13-rc6","v4.12-rc1","v4.12","v4.12-rc5","v4.12-rc7","v4.12-rc6","v4.12-rc4","v4.12-rc2","v4.12-rc3","v4.11","v4.11-rc1","v4.11-rc6","v4.11-rc8","v4.11-rc7","v4.11-rc3","v4.11-rc5","v4.11-rc2","v4.11-rc4","v4.10","v4.9","v4.10-rc8","v4.10-rc3","v4.10-rc1","v4.10-rc7","v4.10-rc6","v4.10-rc2","v4.10-rc5","v4.10-rc4","v4.9-rc7","v4.9-rc6","v4.9-rc8","v4.9-rc1","v4.9-rc5","v4.9-rc3","v4.9-rc4","v4.9-rc2","v4.8","v4.8-rc8","v4.8-rc2","v4.8-rc1","v4.8-rc7","v4.8-rc6","v4.8-rc5","v4.8-rc4","v4.8-rc3"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