{"id":"CVE-2026-89776","state":"PUBLISHED","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.","publishedAt":"2026-09-16T08:48:17.084Z","updatedAt":"2026-10-19T08:52:28.559Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f9c4bb0b245cee35ef66f75bf409c9573d934cf9","status":"affected","lessThan":"e12c4663529699f457b2988c1dfedf4d13b3b3be","versionType":"git"},{"version":"f9c4bb0b245cee35ef66f75bf409c9573d934cf9","status":"affected","lessThan":"47bfcc871576eaef6c8edab6749acd4b317306ea","versionType":"git"},{"version":"f9c4bb0b245cee35ef66f75bf409c9573d934cf9","status":"affected","lessThan":"a9ec10815199f9879ba080241dc555efb1daf324","versionType":"git"},{"version":"f9c4bb0b245cee35ef66f75bf409c9573d934cf9","status":"affected","lessThan":"daebc7064a1b4c12c98e52c4bceede7f2fcd573c","versionType":"git"},{"version":"f9c4bb0b245cee35ef66f75bf409c9573d934cf9","status":"affected","lessThan":"ad32e564c62ebf5ba76dd60a22af52c69d54d17b","versionType":"git"},{"version":"f9c4bb0b245cee35ef66f75bf409c9573d934cf9","status":"affected","lessThan":"984f831dda31b3a18f47454cf64989f65402879e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/vxlan/vxlan_vnifilter.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.18","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/vxlan/vxlan_vnifilter.c"]}],"references":["https://git.kernel.org/stable/c/e12c4663529699f457b2988c1dfedf4d13b3b3be","https://git.kernel.org/stable/c/47bfcc871576eaef6c8edab6749acd4b317306ea","https://git.kernel.org/stable/c/a9ec10815199f9879ba080241dc555efb1daf324","https://git.kernel.org/stable/c/daebc7064a1b4c12c98e52c4bceede7f2fcd573c","https://git.kernel.org/stable/c/ad32e564c62ebf5ba76dd60a22af52c69d54d17b","https://git.kernel.org/stable/c/984f831dda31b3a18f47454cf64989f65402879e"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89776.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89776","state":"PUBLISHED","datePublished":"2026-09-16T08:48:17.084Z","dateUpdated":"2026-10-19T08:52:28.559Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.765Z"},"containers":{"cna":{"title":"vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f9c4bb0b245cee35ef66f75bf409c9573d934cf9","status":"affected","lessThan":"e12c4663529699f457b2988c1dfedf4d13b3b3be","versionType":"git"},{"version":"f9c4bb0b245cee35ef66f75bf409c9573d934cf9","status":"affected","lessThan":"47bfcc871576eaef6c8edab6749acd4b317306ea","versionType":"git"},{"version":"f9c4bb0b245cee35ef66f75bf409c9573d934cf9","status":"affected","lessThan":"a9ec10815199f9879ba080241dc555efb1daf324","versionType":"git"},{"version":"f9c4bb0b245cee35ef66f75bf409c9573d934cf9","status":"affected","lessThan":"daebc7064a1b4c12c98e52c4bceede7f2fcd573c","versionType":"git"},{"version":"f9c4bb0b245cee35ef66f75bf409c9573d934cf9","status":"affected","lessThan":"ad32e564c62ebf5ba76dd60a22af52c69d54d17b","versionType":"git"},{"version":"f9c4bb0b245cee35ef66f75bf409c9573d934cf9","status":"affected","lessThan":"984f831dda31b3a18f47454cf64989f65402879e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/vxlan/vxlan_vnifilter.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.18","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/vxlan/vxlan_vnifilter.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:52:28.559Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}