{"id":"CVE-2026-89776","title":"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 onl…","summary":"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 onl…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9 < e12c4663529699f457b2988c1dfedf4d13b3b3be","Linux >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9 < 47bfcc871576eaef6c8edab6749acd4b317306ea","Linux >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9 < a9ec10815199f9879ba080241dc555efb1daf324","Linux >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9 < daebc7064a1b4c12c98e52c4bceede7f2fcd573c","Linux >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9 < ad32e564c62ebf5ba76dd60a22af52c69d54d17b","Linux >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9 < 984f831dda31b3a18f47454cf64989f65402879e","Linux 5.18"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T09:17:07.950","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89776","references":[{"url":"https://git.kernel.org/stable/c/47bfcc871576eaef6c8edab6749acd4b317306ea","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/984f831dda31b3a18f47454cf64989f65402879e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a9ec10815199f9879ba080241dc555efb1daf324","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ad32e564c62ebf5ba76dd60a22af52c69d54d17b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/daebc7064a1b4c12c98e52c4bceede7f2fcd573c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e12c4663529699f457b2988c1dfedf4d13b3b3be","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T08:52:29.596Z","epss":0.00205,"epssPercentile":0.10896,"slug":"CVE-2026-89776","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}