{"id":"CVE-2026-90327","summary":"phonet: pep: do not write beyond optlen in getsockopt","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nphonet: pep: do not write beyond optlen in getsockopt\n\npep_getsockopt() clamps the reported length to the caller's buffer with\nmin_t(), but then stores the value with put_user(val, (int __user *)\noptval), which always writes sizeof(int) bytes. A getsockopt() call with\nan optlen smaller than sizeof(int) thus reports the clamped length yet\nwrites a full int, one to three bytes past the user buffer.\n\nWrite the value with copy_to_user() bounded by len, so at most optlen\nbytes are copied, matching the length reported back to userspace.","modified":"2026-09-19T03:47:25.924607475Z","published":"2026-09-17T16:08:42.017Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90327.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/056eea1a2068ad2fb7c3093c5f1095268f87d0c7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1bf499e438da80455e258049bce60ffb3a53f3fa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6054fed6bad08b6d03973e8ffca7f0c9394d1c30"},{"type":"WEB","url":"https://git.kernel.org/stable/c/77e5eb0e192aec6710c03ca8144582fd2af36ca4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/95e0ed2439dd1792eb454c68ae8d10f30ffe3bff"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c4487e4d5309de587479ecc2f5173b49586f46f4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eac733a0b6fe0a52d91f9f623425735ed50ac6c2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f97022fefe6eb06ee18549d603420440f2959802"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90327.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90327"},{"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":"02a47617cdce440f60c71a51f3a93f9f5fcc5a7a"},{"fixed":"6054fed6bad08b6d03973e8ffca7f0c9394d1c30"},{"fixed":"eac733a0b6fe0a52d91f9f623425735ed50ac6c2"},{"fixed":"95e0ed2439dd1792eb454c68ae8d10f30ffe3bff"},{"fixed":"056eea1a2068ad2fb7c3093c5f1095268f87d0c7"},{"fixed":"1bf499e438da80455e258049bce60ffb3a53f3fa"},{"fixed":"c4487e4d5309de587479ecc2f5173b49586f46f4"},{"fixed":"f97022fefe6eb06ee18549d603420440f2959802"},{"fixed":"77e5eb0e192aec6710c03ca8144582fd2af36ca4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90327.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.28"},{"fixed":"5.10.270"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.221"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.188"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.157"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90327.json"}}],"schema_version":"1.9.0"}