{"id":"CVE-2026-53238","summary":"netlabel: validate unlabeled address and mask attribute lengths","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetlabel: validate unlabeled address and mask attribute lengths\n\nnetlbl_unlabel_addrinfo_get() used the address attribute length to\ndetermine whether the attribute data could be read as an IPv4 or IPv6\naddress, but did not independently validate the corresponding mask\nattribute length.  A crafted Generic Netlink request could therefore\nprovide a valid IPv4/IPv6 address attribute with a shorter mask\nattribute, which would later be read as a full struct in_addr or\nstruct in6_addr.\n\nNLA_BINARY policy lengths are maximum lengths by default, so use\nNLA_POLICY_EXACT_LEN() for the unlabeled IPv4/IPv6 address and mask\nattributes.  This rejects short attributes during policy validation and\nalso exposes the exact length requirements through policy introspection.","modified":"2026-07-11T03:55:28.693063886Z","published":"2026-06-25T08:39:34.492Z","related":["CGA-vmf9-6g69-cr86"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53238.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/672f0f3b8f875ffe6525a37847eafa7648c4c0c6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/71c52da13c3737493b42d20d9f33de34e03b3156"},{"type":"WEB","url":"https://git.kernel.org/stable/c/95bda3eac0b1454c2cee98d58d9ba6dd8391e843"},{"type":"WEB","url":"https://git.kernel.org/stable/c/975a84fd741440853380d37465b6e226cf47254c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9772589b57e44aedc240211c5c3f7a684a034d3a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ccfe292a966079c61ea68a2da303b2a336170993"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53238.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53238"},{"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":"8cc44579d1bd77ba3a32f2cb76fd9669c229c5fd"},{"fixed":"975a84fd741440853380d37465b6e226cf47254c"},{"fixed":"672f0f3b8f875ffe6525a37847eafa7648c4c0c6"},{"fixed":"95bda3eac0b1454c2cee98d58d9ba6dd8391e843"},{"fixed":"07a18f5c90dd3d586b73242f5a5bbf0a72f2fdc6"},{"fixed":"71c52da13c3737493b42d20d9f33de34e03b3156"},{"fixed":"0c4bb32ad7fdc2dc6a8050f41eb04d4bda56b6c8"},{"fixed":"ccfe292a966079c61ea68a2da303b2a336170993"},{"fixed":"9772589b57e44aedc240211c5c3f7a684a034d3a"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-53238.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.25"},{"fixed":"5.10.259"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.210"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.176"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.143"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.94"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.36"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-53238.json"}}],"schema_version":"1.7.5"}