{"id":"CVE-2026-45927","summary":"bpf: Require frozen map for calculating map hash","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Require frozen map for calculating map hash\n\nCurrently, bpf_map_get_info_by_fd calculates and caches the hash of the\nmap regardless of the map's frozen state.\n\nThis leads to a TOCTOU bug where userspace can call\nBPF_OBJ_GET_INFO_BY_FD to cache the hash and then modify the map\ncontents before freezing.\n\nTherefore, a trusted loader can be tricked into verifying the stale hash\nwhile loading the modified contents.\n\nFix this by returning -EPERM if the map is not frozen when the hash is\nrequested. This ensures the hash is only generated for the final,\nimmutable state of the map.","modified":"2026-07-15T01:49:06.811572371Z","published":"2026-05-27T12:17:46.284Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45927.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/7752d36343862323bbeea4ce3adf0ec2ed86e122"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a2c86aa621c22f2a7e26c654f936d65cfff0aa91"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f415e114b58fe02c41191e47f24bdabb438daf72"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45927.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45927"},{"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":"ea2e6467ac36bf3d785defc89e58269b15d182f7"},{"fixed":"7752d36343862323bbeea4ce3adf0ec2ed86e122"},{"fixed":"f415e114b58fe02c41191e47f24bdabb438daf72"},{"fixed":"a2c86aa621c22f2a7e26c654f936d65cfff0aa91"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45927.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.18.0"},{"fixed":"6.18.14"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45927.json"}}],"schema_version":"1.7.5"}