{"id":"CVE-2021-34556","revision":"2240e3844d4342c79ff0d873610bb5d4","records":[{"revision":"2240e3844d4342c79ff0d873610bb5d4","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2021-34556","aliases":[],"title":"In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because the protection mechanism neglects the possibility of uninitialize…","description":"In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because the protection mechanism neglects the possibility of uninitialized memory locations on the BPF stack.","state":0,"publishedAt":"2021-08-02T04:02:40+00:00","modifiedAt":"2026-10-08T21:03:27.477+00:00","affected":[{"ecosystem":"Vendor product","name":"n/a","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"n/a\",\n                    \"vendor\": \"n/a\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"n/a\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=f5e81d1117501546b7be050c5fbafa6efd2c722c","https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=2039f26f3aca5b0e419b98f65dd36481337b86ee","http://www.openwall.com/lists/oss-security/2021/08/01/3","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6JKK6XNRZX5BT5QVYOKGVJ2BHFZAP5EX/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/565ZS55ZFEN62WVRRORT7R63RXW5F4T4/","https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2021-34556","license":"CVE Program Terms of Use","key":"cve-program:CVE-2021-34556","identifiers":["CVE-2021-34556"]},"retained":false,"historicalAffected":[]}],"coverage":[]}