CVE-2026-64089 (GCVE-0-2026-64089)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-08-05 12:39
VLAI
Title
batman-adv: tt: fix negative last_changeset_len
Summary
In the Linux kernel, the following vulnerability has been resolved: batman-adv: tt: fix negative last_changeset_len batadv_piv_tt::last_changeset_len len was declared as s16, but the field is never intended to hold a negative value. When a value greater than 32767 is assigned, it wraps to a negative signed integer. In batadv_send_my_tt_response(), last_changeset_len is temporarily widened to s32. The incorrectly negative s16 value propagates into the s32, causing batadv_tt_prepare_tvlv_local_data() to allocate a full sized buffer but populates only a small portion of it with the collected changeset. All remaining bits are kept uninitialized. Using an u16 avoids this type confusion and ensures that no (negative) sign extension is performed in batadv_send_my_tt_response().
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a73105b8d4c765d9ebfb664d0a66802127d8e4c7 , < 6314089acf0ddf64376fdc0b1420695504c73f52 (git)
Affected: a73105b8d4c765d9ebfb664d0a66802127d8e4c7 , < 55dc41fe8821e9a849e147255ad572bc933a9d15 (git)
Affected: a73105b8d4c765d9ebfb664d0a66802127d8e4c7 , < c424e8519ac78eac5d9f4eecf06208a0d619ec14 (git)
Affected: a73105b8d4c765d9ebfb664d0a66802127d8e4c7 , < 22d59c72f4a47ffec121d0610f70d0d70c3c11c8 (git)
Affected: a73105b8d4c765d9ebfb664d0a66802127d8e4c7 , < eb235472b52ef36981c5aad330485eaf2382c53b (git)
Affected: a73105b8d4c765d9ebfb664d0a66802127d8e4c7 , < 179eb62506a02d00370bd6478898cb632e10986c (git)
Affected: a73105b8d4c765d9ebfb664d0a66802127d8e4c7 , < d29abf70c665730e249d2ec8e1402095ae26bcee (git)
Affected: a73105b8d4c765d9ebfb664d0a66802127d8e4c7 , < fc92cdfcb295cefa4344d71a527d61b638b7bfc4 (git)
Create a notification for this product.
Linux Linux Affected: 3.1
Unaffected: 0 , < 3.1 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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              "value": "AV:N - The bug is reached when a remote mesh peer\u0027s TT_REQUEST is processed via batman-adv\u0027s 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 \u003e2730 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\u0027s 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."
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    "dateUpdated": "2026-08-05T12:39:06.132Z",
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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\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/batman-adv/types.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"a73105b8d4c765d9ebfb664d0a66802127d8e4c7\",\"lessThan\":\"6314089acf0ddf64376fdc0b1420695504c73f52\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a73105b8d4c765d9ebfb664d0a66802127d8e4c7\",\"lessThan\":\"55dc41fe8821e9a849e147255ad572bc933a9d15\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a73105b8d4c765d9ebfb664d0a66802127d8e4c7\",\"lessThan\":\"c424e8519ac78eac5d9f4eecf06208a0d619ec14\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a73105b8d4c765d9ebfb664d0a66802127d8e4c7\",\"lessThan\":\"22d59c72f4a47ffec121d0610f70d0d70c3c11c8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a73105b8d4c765d9ebfb664d0a66802127d8e4c7\",\"lessThan\":\"eb235472b52ef36981c5aad330485eaf2382c53b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a73105b8d4c765d9ebfb664d0a66802127d8e4c7\",\"lessThan\":\"179eb62506a02d00370bd6478898cb632e10986c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a73105b8d4c765d9ebfb664d0a66802127d8e4c7\",\"lessThan\":\"d29abf70c665730e249d2ec8e1402095ae26bcee\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a73105b8d4c765d9ebfb664d0a66802127d8e4c7\",\"lessThan\":\"fc92cdfcb295cefa4344d71a527d61b638b7bfc4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/batman-adv/types.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.1\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.142\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.92\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.1\",\"versionEndExcluding\":\"5.10.258\",\"matchCriteriaId\":\"B5F925AF-0571-45EB-B3C7-3046B450381F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.209\",\"matchCriteriaId\":\"919C10A9-7951-4A74-BADD-C135A0A8D8B4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.175\",\"matchCriteriaId\":\"92385813-D91D-480D-83A1-F423D2CBB2BA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.142\",\"matchCriteriaId\":\"FBFF77B0-526A-4AF1-84D0-ED7187624A67\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.92\",\"matchCriteriaId\":\"9CB90BD9-95B7-4D7F-9F17-4ECE6CFB66C9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.34\",\"matchCriteriaId\":\"A4B1EF6D-18D7-4838-BC37-7499D5DCC3C0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T09:08:14+00:00",
      "cve": "CVE-2026-64089",
      "id": "CVE-2026-64089",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: batman-adv: tt: fix negative last_changeset_len",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64089.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-10T16:24:20Z",
      "cve": "CVE-2026-64089",
      "id": "CVE-2026-64089",
      "initial_release_date": "2026-07-21T12:59:53Z",
      "product_status:first_fixed": "98",
      "product_status:known_affected": "222",
      "product_status:known_not_affected": "74",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64089",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64089.json",
      "version": "4"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.