{"api_version":"1","generated_at":"2026-07-22T12:32:02+00:00","cve":"CVE-2026-64088","urls":{"html":"https://cve.report/CVE-2026-64088","api":"https://cve.report/api/cve/CVE-2026-64088.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64088","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64088"},"summary":{"title":"batman-adv: tt: fix negative tt_buff_len","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tt: fix negative tt_buff_len\n\nbatadv_orig_node::tt_buff_len was declared as s16, but the field is never\nintended to hold a negative value. When a value greater than 32767 is\nassigned, it wraps to a negative signed integer.\n\nIn batadv_send_other_tt_response(), tt_buff_len is temporarily widened to\ns32. The incorrectly negative s16 value propagates into the s32, causing\nbatadv_tt_prepare_tvlv_global_data() to allocate a full sized buffer but\npopulates only a small portion of it with the collected changeset. All\nremaining bits are kept uninitialized.\n\nUsing an u16 avoids this type confusion and ensures that no (negative) sign\nextension is performed in batadv_send_other_tt_response().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:49","updated_at":"2026-07-20 15:17:08"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/ed28ead3420c373a7928622f114bc6168075d1e1","name":"https://git.kernel.org/stable/c/ed28ead3420c373a7928622f114bc6168075d1e1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/730de8733dd90f70d7580a9b329b971f8e1474a2","name":"https://git.kernel.org/stable/c/730de8733dd90f70d7580a9b329b971f8e1474a2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4c4c2f340f4c27373bfcac8dc5032ce7bb474e47","name":"https://git.kernel.org/stable/c/4c4c2f340f4c27373bfcac8dc5032ce7bb474e47","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b64963a2ceeb7529310b6cf253a1e540784422f4","name":"https://git.kernel.org/stable/c/b64963a2ceeb7529310b6cf253a1e540784422f4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/32edd2a28e112064020a2f319a8cb8a9e5a09767","name":"https://git.kernel.org/stable/c/32edd2a28e112064020a2f319a8cb8a9e5a09767","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3c96dff00998314983b68a3e7caac07a66ebe496","name":"https://git.kernel.org/stable/c/3c96dff00998314983b68a3e7caac07a66ebe496","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430","name":"https://git.kernel.org/stable/c/33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4dab98961426d0cf6a1599cda6950b7596ca2fcd","name":"https://git.kernel.org/stable/c/4dab98961426d0cf6a1599cda6950b7596ca2fcd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64088","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64088","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a73105b8d4c765d9ebfb664d0a66802127d8e4c7 4c4c2f340f4c27373bfcac8dc5032ce7bb474e47 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a73105b8d4c765d9ebfb664d0a66802127d8e4c7 33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a73105b8d4c765d9ebfb664d0a66802127d8e4c7 3c96dff00998314983b68a3e7caac07a66ebe496 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a73105b8d4c765d9ebfb664d0a66802127d8e4c7 32edd2a28e112064020a2f319a8cb8a9e5a09767 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.209 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.175 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.142 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.92 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.34 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.11 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64088","cve":"CVE-2026-64088","epss":"0.001840000","percentile":"0.082490000","score_date":"2026-07-20","updated_at":"2026-07-21 00:13:13"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/batman-adv/types.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"4c4c2f340f4c27373bfcac8dc5032ce7bb474e47","status":"affected","version":"a73105b8d4c765d9ebfb664d0a66802127d8e4c7","versionType":"git"},{"lessThan":"33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430","status":"affected","version":"a73105b8d4c765d9ebfb664d0a66802127d8e4c7","versionType":"git"},{"lessThan":"3c96dff00998314983b68a3e7caac07a66ebe496","status":"affected","version":"a73105b8d4c765d9ebfb664d0a66802127d8e4c7","versionType":"git"},{"lessThan":"32edd2a28e112064020a2f319a8cb8a9e5a09767","status":"affected","version":"a73105b8d4c765d9ebfb664d0a66802127d8e4c7","versionType":"git"},{"lessThan":"4dab98961426d0cf6a1599cda6950b7596ca2fcd","status":"affected","version":"a73105b8d4c765d9ebfb664d0a66802127d8e4c7","versionType":"git"},{"lessThan":"730de8733dd90f70d7580a9b329b971f8e1474a2","status":"affected","version":"a73105b8d4c765d9ebfb664d0a66802127d8e4c7","versionType":"git"},{"lessThan":"ed28ead3420c373a7928622f114bc6168075d1e1","status":"affected","version":"a73105b8d4c765d9ebfb664d0a66802127d8e4c7","versionType":"git"},{"lessThan":"b64963a2ceeb7529310b6cf253a1e540784422f4","status":"affected","version":"a73105b8d4c765d9ebfb664d0a66802127d8e4c7","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/batman-adv/types.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.1"},{"lessThan":"3.1","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.258","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.209","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.175","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.142","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.92","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.34","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.258","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.209","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.175","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.142","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.92","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.34","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.11","versionStartIncluding":"3.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"3.1","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tt: fix negative tt_buff_len\n\nbatadv_orig_node::tt_buff_len was declared as s16, but the field is never\nintended to hold a negative value. When a value greater than 32767 is\nassigned, it wraps to a negative signed integer.\n\nIn batadv_send_other_tt_response(), tt_buff_len is temporarily widened to\ns32. The incorrectly negative s16 value propagates into the s32, causing\nbatadv_tt_prepare_tvlv_global_data() to allocate a full sized buffer but\npopulates only a small portion of it with the collected changeset. All\nremaining bits are kept uninitialized.\n\nUsing an u16 avoids this type confusion and ensures that no (negative) sign\nextension is performed in batadv_send_other_tt_response()."}],"metrics":[{"cvssV3_1":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-20T13:43:11.384Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/4c4c2f340f4c27373bfcac8dc5032ce7bb474e47"},{"url":"https://git.kernel.org/stable/c/33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430"},{"url":"https://git.kernel.org/stable/c/3c96dff00998314983b68a3e7caac07a66ebe496"},{"url":"https://git.kernel.org/stable/c/32edd2a28e112064020a2f319a8cb8a9e5a09767"},{"url":"https://git.kernel.org/stable/c/4dab98961426d0cf6a1599cda6950b7596ca2fcd"},{"url":"https://git.kernel.org/stable/c/730de8733dd90f70d7580a9b329b971f8e1474a2"},{"url":"https://git.kernel.org/stable/c/ed28ead3420c373a7928622f114bc6168075d1e1"},{"url":"https://git.kernel.org/stable/c/b64963a2ceeb7529310b6cf253a1e540784422f4"}],"title":"batman-adv: tt: fix negative tt_buff_len","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64088","datePublished":"2026-07-19T15:39:58.084Z","dateReserved":"2026-07-19T07:54:57.032Z","dateUpdated":"2026-07-20T13:43:11.384Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:49","lastModifiedDate":"2026-07-20 15:17:08","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64088","Ordinal":"1","Title":"batman-adv: tt: fix negative tt_buff_len","CVE":"CVE-2026-64088","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64088","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tt: fix negative tt_buff_len\n\nbatadv_orig_node::tt_buff_len was declared as s16, but the field is never\nintended to hold a negative value. When a value greater than 32767 is\nassigned, it wraps to a negative signed integer.\n\nIn batadv_send_other_tt_response(), tt_buff_len is temporarily widened to\ns32. The incorrectly negative s16 value propagates into the s32, causing\nbatadv_tt_prepare_tvlv_global_data() to allocate a full sized buffer but\npopulates only a small portion of it with the collected changeset. All\nremaining bits are kept uninitialized.\n\nUsing an u16 avoids this type confusion and ensures that no (negative) sign\nextension is performed in batadv_send_other_tt_response().","Type":"Description","Title":"batman-adv: tt: fix negative tt_buff_len"}]}}}