{"id":"CVE-2026-89776","summary":"vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes\n\nThe VXLAN VNI filter entry policy declares the GROUP/GROUP6 address\nattributes as NLA_BINARY with only a maximum length, so validate_nla()\naccepts a payload shorter than the address. The GROUP consumer reads it\nwith nla_get_in_addr(), an unconditional 4-byte load, so a short\nattribute over-reads up to 3 bytes of uninitialised slab data, which are\nstored into remote_ip and echoed back via RTM_GETTUNNEL, disclosing\nkernel memory.\n\nSwitch both entries to NLA_POLICY_EXACT_LEN() so the validator rejects\nany GROUP/GROUP6 that is not exactly 4 / 16 bytes; a valid address is\nalways sent at full width.","modified":"2026-09-18T03:48:32.449909264Z","published":"2026-09-16T08:48:17.084Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89776.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/47bfcc871576eaef6c8edab6749acd4b317306ea"},{"type":"WEB","url":"https://git.kernel.org/stable/c/984f831dda31b3a18f47454cf64989f65402879e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a9ec10815199f9879ba080241dc555efb1daf324"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ad32e564c62ebf5ba76dd60a22af52c69d54d17b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/daebc7064a1b4c12c98e52c4bceede7f2fcd573c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e12c4663529699f457b2988c1dfedf4d13b3b3be"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89776.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89776"},{"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":"f9c4bb0b245cee35ef66f75bf409c9573d934cf9"},{"fixed":"e12c4663529699f457b2988c1dfedf4d13b3b3be"},{"fixed":"47bfcc871576eaef6c8edab6749acd4b317306ea"},{"fixed":"a9ec10815199f9879ba080241dc555efb1daf324"},{"fixed":"daebc7064a1b4c12c98e52c4bceede7f2fcd573c"},{"fixed":"ad32e564c62ebf5ba76dd60a22af52c69d54d17b"},{"fixed":"984f831dda31b3a18f47454cf64989f65402879e"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89776.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.18.0"},{"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-2026-89776.json"}}],"schema_version":"1.9.0"}