{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64089", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.032Z", "datePublished": "2026-07-19T15:39:58.729Z", "dateUpdated": "2026-07-19T15:39:58.729Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-19T15:39:58.729Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tt: fix negative last_changeset_len\n\nbatadv_piv_tt::last_changeset_len len was declared as s16, but the field is\nnever intended to hold a negative value. When a value greater than 32767 is\nassigned, it wraps to a negative signed integer.\n\nIn batadv_send_my_tt_response(), last_changeset_len is temporarily widened\nto s32. The incorrectly negative s16 value propagates into the s32, causing\nbatadv_tt_prepare_tvlv_local_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_my_tt_response()."}], "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": "6314089acf0ddf64376fdc0b1420695504c73f52", "status": "affected", "versionType": "git"}, {"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7", "lessThan": "55dc41fe8821e9a849e147255ad572bc933a9d15", "status": "affected", "versionType": "git"}, {"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7", "lessThan": "c424e8519ac78eac5d9f4eecf06208a0d619ec14", "status": "affected", "versionType": "git"}, {"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7", "lessThan": "22d59c72f4a47ffec121d0610f70d0d70c3c11c8", "status": "affected", "versionType": "git"}, {"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7", "lessThan": "eb235472b52ef36981c5aad330485eaf2382c53b", "status": "affected", "versionType": "git"}, {"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7", "lessThan": "179eb62506a02d00370bd6478898cb632e10986c", "status": "affected", "versionType": "git"}, {"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7", "lessThan": "d29abf70c665730e249d2ec8e1402095ae26bcee", "status": "affected", "versionType": "git"}, {"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7", "lessThan": "fc92cdfcb295cefa4344d71a527d61b638b7bfc4", "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/6314089acf0ddf64376fdc0b1420695504c73f52"}, {"url": "https://git.kernel.org/stable/c/55dc41fe8821e9a849e147255ad572bc933a9d15"}, {"url": "https://git.kernel.org/stable/c/c424e8519ac78eac5d9f4eecf06208a0d619ec14"}, {"url": "https://git.kernel.org/stable/c/22d59c72f4a47ffec121d0610f70d0d70c3c11c8"}, {"url": "https://git.kernel.org/stable/c/eb235472b52ef36981c5aad330485eaf2382c53b"}, {"url": "https://git.kernel.org/stable/c/179eb62506a02d00370bd6478898cb632e10986c"}, {"url": "https://git.kernel.org/stable/c/d29abf70c665730e249d2ec8e1402095ae26bcee"}, {"url": "https://git.kernel.org/stable/c/fc92cdfcb295cefa4344d71a527d61b638b7bfc4"}], "title": "batman-adv: tt: fix negative last_changeset_len", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{}

{"bugzilla": {"description": "kernel: batman-adv: tt: fix negative last_changeset_len", "id": "2502577", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502577"}, "csaw": false, "cwe": "CWE-190", "details": ["A flaw was found in the Linux kernel's batman-adv module. An integer overflow vulnerability in the last_changeset_len field can cause it to become a negative value. This leads to a buffer being improperly initialized, potentially exposing sensitive information. A local attacker could exploit this to achieve information disclosure."], "name": "CVE-2026-64089", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64089\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64089\nhttps://lore.kernel.org/linux-cve-announce/2026071917-CVE-2026-64089-321e@gregkh/T"]}

{}