{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64088", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.032Z", "datePublished": "2026-07-19T15:39:58.084Z", "dateUpdated": "2026-07-20T13:43:11.384Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-20T13:43:11.384Z"}, "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": {"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"}}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/batman-adv/types.h"], "versions": [{"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7", "lessThan": "4c4c2f340f4c27373bfcac8dc5032ce7bb474e47", "status": "affected", "versionType": "git"}, {"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7", "lessThan": "33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430", "status": "affected", "versionType": "git"}, {"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7", "lessThan": "3c96dff00998314983b68a3e7caac07a66ebe496", "status": "affected", "versionType": "git"}, {"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7", "lessThan": "32edd2a28e112064020a2f319a8cb8a9e5a09767", "status": "affected", "versionType": "git"}, {"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7", "lessThan": "4dab98961426d0cf6a1599cda6950b7596ca2fcd", "status": "affected", "versionType": "git"}, {"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7", "lessThan": "730de8733dd90f70d7580a9b329b971f8e1474a2", "status": "affected", "versionType": "git"}, {"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7", "lessThan": "ed28ead3420c373a7928622f114bc6168075d1e1", "status": "affected", "versionType": "git"}, {"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7", "lessThan": "b64963a2ceeb7529310b6cf253a1e540784422f4", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/batman-adv/types.h"], "versions": [{"version": "3.1", "status": "affected"}, {"version": "0", "lessThan": "3.1", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.142", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.92", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "5.10.258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "5.15.209"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.1.175"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.6.142"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.12.92"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "7.1"}]}]}], "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"}}}}

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