CVE-2026-64089

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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()."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is reached when a remote mesh peer's TT_REQUEST is processed via batman-adv's network receive path (batadv_recv_unicast_tvlv), which handles ETH_P_BATMAN packets from network-facing mesh interfaces without requiring local access.\nAC:L - Once the victim has a wrapped last_changeset_len (achievable on high-MTU mesh nodes with >2730 TT changes), the attacker reliably triggers the bug by sending a crafted TT_REQUEST with matching ttvn and without BATADV_TT_FULL_TABLE; no race or victim-dependent timing is required.\nPR:N - Exploitation requires only the ability to send batman-adv protocol packets as a mesh peer; no account, credentials, or elevated privileges on the victim system are needed, and TT_REQUEST handling has no authentication gate beyond being a known originator in the mesh.\nUI:N - The victim administrator or end user need take no action during exploitation; the attacker sends a TT_REQUEST and the kernel processes it automatically in response to received mesh traffic.\nS:U - The vulnerability corrupts kernel heap memory and leaks kernel data within the kernel's own security boundary; it does not cross into another security authority such as a VM guest-to-host or sandbox escape.\nC:H - Sign-extended negative last_changeset_len causes memcpy() to read far beyond the small last_changeset buffer (OOB heap read), and the oversized kmalloc response buffer retains uninitialized kernel memory that is copied into the TT_RESPONSE sent back to the attacker.\nI:H - The same memcpy() with a sign-extended negative length writes far beyond the allocated tt_change region in the kmalloc buffer, causing out-of-bounds heap corruption that can be leveraged for arbitrary kernel writes or control-flow hijacking.\nA:H - The massive out-of-bounds memcpy() from a wrapped s16 length will cause kernel memory corruption, oops, or panic, and even partial execution leaks uninitialized data before potential crash."}]}], "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", 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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()."}], "id": "CVE-2026-64089", "lastModified": "2026-08-11T15:33:55.310", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-19T16:17:49.697", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/179eb62506a02d00370bd6478898cb632e10986c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/22d59c72f4a47ffec121d0610f70d0d70c3c11c8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/55dc41fe8821e9a849e147255ad572bc933a9d15"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6314089acf0ddf64376fdc0b1420695504c73f52"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c424e8519ac78eac5d9f4eecf06208a0d619ec14"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d29abf70c665730e249d2ec8e1402095ae26bcee"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eb235472b52ef36981c5aad330485eaf2382c53b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fc92cdfcb295cefa4344d71a527d61b638b7bfc4"}], "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 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"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a73105b8d4c765d9ebfb664d0a66802127d8e4c7,6314089acf0ddf64376fdc0b1420695504c73f52)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a73105b8d4c765d9ebfb664d0a66802127d8e4c7,55dc41fe8821e9a849e147255ad572bc933a9d15)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a73105b8d4c765d9ebfb664d0a66802127d8e4c7,c424e8519ac78eac5d9f4eecf06208a0d619ec14)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a73105b8d4c765d9ebfb664d0a66802127d8e4c7,22d59c72f4a47ffec121d0610f70d0d70c3c11c8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a73105b8d4c765d9ebfb664d0a66802127d8e4c7,eb235472b52ef36981c5aad330485eaf2382c53b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a73105b8d4c765d9ebfb664d0a66802127d8e4c7,179eb62506a02d00370bd6478898cb632e10986c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a73105b8d4c765d9ebfb664d0a66802127d8e4c7,d29abf70c665730e249d2ec8e1402095ae26bcee)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a73105b8d4c765d9ebfb664d0a66802127d8e4c7,fc92cdfcb295cefa4344d71a527d61b638b7bfc4)"}}], "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": "semver", "value": "[5.10.258,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.209,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.175,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.142,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.92,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.34,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.11,7.1.0)"}}, {"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": "2026-07-22T03:30:12.135783+00:00", "title": "batman\u2011adv Sign Extension Causes Uninitialized Buffer Allocation", "updated": "2026-08-13T13:15:04.111083+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}