{"api_version":"1","generated_at":"2026-09-16T20:18:54+00:00","cve":"CVE-2026-89776","urls":{"html":"https://cve.report/CVE-2026-89776","api":"https://cve.report/api/cve/CVE-2026-89776.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89776","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89776"},"summary":{"title":"vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-16 09:17:07","updated_at":"2026-09-16 09:17:07"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/984f831dda31b3a18f47454cf64989f65402879e","name":"https://git.kernel.org/stable/c/984f831dda31b3a18f47454cf64989f65402879e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e12c4663529699f457b2988c1dfedf4d13b3b3be","name":"https://git.kernel.org/stable/c/e12c4663529699f457b2988c1dfedf4d13b3b3be","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ad32e564c62ebf5ba76dd60a22af52c69d54d17b","name":"https://git.kernel.org/stable/c/ad32e564c62ebf5ba76dd60a22af52c69d54d17b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a9ec10815199f9879ba080241dc555efb1daf324","name":"https://git.kernel.org/stable/c/a9ec10815199f9879ba080241dc555efb1daf324","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/47bfcc871576eaef6c8edab6749acd4b317306ea","name":"https://git.kernel.org/stable/c/47bfcc871576eaef6c8edab6749acd4b317306ea","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/daebc7064a1b4c12c98e52c4bceede7f2fcd573c","name":"https://git.kernel.org/stable/c/daebc7064a1b4c12c98e52c4bceede7f2fcd573c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89776","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89776","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f9c4bb0b245cee35ef66f75bf409c9573d934cf9 e12c4663529699f457b2988c1dfedf4d13b3b3be git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f9c4bb0b245cee35ef66f75bf409c9573d934cf9 47bfcc871576eaef6c8edab6749acd4b317306ea git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f9c4bb0b245cee35ef66f75bf409c9573d934cf9 a9ec10815199f9879ba080241dc555efb1daf324 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f9c4bb0b245cee35ef66f75bf409c9573d934cf9 daebc7064a1b4c12c98e52c4bceede7f2fcd573c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f9c4bb0b245cee35ef66f75bf409c9573d934cf9 ad32e564c62ebf5ba76dd60a22af52c69d54d17b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f9c4bb0b245cee35ef66f75bf409c9573d934cf9 984f831dda31b3a18f47454cf64989f65402879e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.18","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.18 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.188 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.52 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.6 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * 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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."}],"providerMetadata":{"dateUpdated":"2026-09-16T08:48:17.084Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/e12c4663529699f457b2988c1dfedf4d13b3b3be"},{"url":"https://git.kernel.org/stable/c/47bfcc871576eaef6c8edab6749acd4b317306ea"},{"url":"https://git.kernel.org/stable/c/a9ec10815199f9879ba080241dc555efb1daf324"},{"url":"https://git.kernel.org/stable/c/daebc7064a1b4c12c98e52c4bceede7f2fcd573c"},{"url":"https://git.kernel.org/stable/c/ad32e564c62ebf5ba76dd60a22af52c69d54d17b"},{"url":"https://git.kernel.org/stable/c/984f831dda31b3a18f47454cf64989f65402879e"}],"title":"vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89776","datePublished":"2026-09-16T08:48:17.084Z","dateReserved":"2026-09-11T19:38:34.765Z","dateUpdated":"2026-09-16T08:48:17.084Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-16 09:17:07","lastModifiedDate":"2026-09-16 09:17:07","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89776","Ordinal":"1","Title":"vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attribute","CVE":"CVE-2026-89776","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89776","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attribute"}]}}}