{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-45927","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-13T15:03:33.086Z","datePublished":"2026-05-27T12:17:46.284Z","dateUpdated":"2026-05-27T12:17:46.284Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-27T12:17:46.284Z"},"descriptions":[{"lang":"en","value":"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/syscall.c"],"versions":[{"version":"ea2e6467ac36bf3d785defc89e58269b15d182f7","lessThan":"7752d36343862323bbeea4ce3adf0ec2ed86e122","status":"affected","versionType":"git"},{"version":"ea2e6467ac36bf3d785defc89e58269b15d182f7","lessThan":"f415e114b58fe02c41191e47f24bdabb438daf72","status":"affected","versionType":"git"},{"version":"ea2e6467ac36bf3d785defc89e58269b15d182f7","lessThan":"a2c86aa621c22f2a7e26c654f936d65cfff0aa91","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/syscall.c"],"versions":[{"version":"6.18","status":"affected"},{"version":"0","lessThan":"6.18","status":"unaffected","versionType":"semver"},{"version":"6.18.14","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.4","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.18.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.19.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/7752d36343862323bbeea4ce3adf0ec2ed86e122"},{"url":"https://git.kernel.org/stable/c/f415e114b58fe02c41191e47f24bdabb438daf72"},{"url":"https://git.kernel.org/stable/c/a2c86aa621c22f2a7e26c654f936d65cfff0aa91"}],"title":"bpf: Require frozen map for calculating map hash","x_generator":{"engine":"bippy-1.2.0"}}}}