CVE-2026-64088

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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"}, "scenarios": [{"lang": "en", "value": "AV:A - Batman-adv processes attacker-controlled translation-table TVLV traffic from mesh peers over WiFi/Ethernet L2; exploitation requires the attacker to be on the same wireless or LAN segment as the victim mesh node, matching the Adjacent definition for WiFi/L2 mesh protocols.\nAC:L - An adjacent mesh attacker can send unauthenticated TT_REQUEST/TT_RESPONSE/OGM TVLV packets to populate `tt_buff_len` and then trigger `batadv_send_other_tt_response()` without depending on victim-controlled timing or memory layout.\nPR:N - The vulnerable path is reached from pre-authentication mesh control-plane packet handling (`batadv_recv_unicast_tvlv` \u2192 `batadv_tt_tvlv_unicast_handler_v1`); no Linux credentials or capabilities are required on the victim host beyond having an active batman-adv mesh interface.\nUI:N - Exploitation requires only crafted mesh protocol packets from an adjacent attacker; no victim user action (opening files, clicking links, etc.) is needed at attack time.\nS:U - Impact is confined to kernel memory disclosure/corruption and potential local privilege escalation within the same kernel security authority; it does not cross VM, container, or IOMMU boundaries.\nC:H - Sign-extended negative `tt_buff_len` causes `batadv_tt_prepare_tvlv_global_data()` to allocate a large buffer but only partially fill it, leaving the remainder uninitialized and transmitted to the requester in the TT_RESPONSE via `batadv_tvlv_unicast_send()`.\nI:H - The same type confusion passes a negative `s16` length to `memcpy()`, which promotes to a very large `size_t` and can cause out-of-bounds reads/writes from the undersized `tt_buff` allocation, enabling heap memory corruption.\nA:H - The malformed `memcpy()` and associated heap corruption can trigger kernel oops/panic on the responding mesh node, and the bug class inherently threatens system availability even when not fully weaponized."}]}], "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": 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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()."}], "id": "CVE-2026-64088", "lastModified": "2026-08-11T15:32:36.470", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-19T16:17:49.557", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/32edd2a28e112064020a2f319a8cb8a9e5a09767"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3c96dff00998314983b68a3e7caac07a66ebe496"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c4c2f340f4c27373bfcac8dc5032ce7bb474e47"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4dab98961426d0cf6a1599cda6950b7596ca2fcd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/730de8733dd90f70d7580a9b329b971f8e1474a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b64963a2ceeb7529310b6cf253a1e540784422f4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ed28ead3420c373a7928622f114bc6168075d1e1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: batman-adv: tt: fix negative tt_buff_len", "id": "2502503", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502503"}, "csaw": false, "cwe": "CWE-908", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbatman-adv: tt: fix negative tt_buff_len\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.\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.\nUsing an u16 avoids this type confusion and ensures that no (negative) sign\nextension is performed in batadv_send_other_tt_response().", "A flaw was found in the Linux kernel's batman-adv component. An integer overflow vulnerability exists where the 'tt_buff_len' variable, intended to be a positive length, can become a negative value. This occurs when a large value is assigned, causing it to wrap around. This incorrect negative value can lead to the allocation of a buffer that is not fully initialized, potentially resulting in information disclosure to an attacker."], "name": "CVE-2026-64088", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "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-2026-64088\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64088\nhttps://lore.kernel.org/linux-cve-announce/2026071917-CVE-2026-64088-8d44@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a73105b8d4c765d9ebfb664d0a66802127d8e4c7,4c4c2f340f4c27373bfcac8dc5032ce7bb474e47)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a73105b8d4c765d9ebfb664d0a66802127d8e4c7,33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a73105b8d4c765d9ebfb664d0a66802127d8e4c7,3c96dff00998314983b68a3e7caac07a66ebe496)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a73105b8d4c765d9ebfb664d0a66802127d8e4c7,32edd2a28e112064020a2f319a8cb8a9e5a09767)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a73105b8d4c765d9ebfb664d0a66802127d8e4c7,4dab98961426d0cf6a1599cda6950b7596ca2fcd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a73105b8d4c765d9ebfb664d0a66802127d8e4c7,730de8733dd90f70d7580a9b329b971f8e1474a2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a73105b8d4c765d9ebfb664d0a66802127d8e4c7,ed28ead3420c373a7928622f114bc6168075d1e1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a73105b8d4c765d9ebfb664d0a66802127d8e4c7,b64963a2ceeb7529310b6cf253a1e540784422f4)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.10.258,6.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.15.209,6.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.175,7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.142,7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.92,7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.34,7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0.11,8.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-21T11:15:05.702094+00:00", "updated": "2026-08-13T12:15:17.533625+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}