264 lines
14 KiB
JSON
264 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-64088",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-19T07:54:57.032Z",
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"datePublished": "2026-07-19T15:39:58.084Z",
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"dateUpdated": "2026-08-05T12:39:05.060Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:39:05.060Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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()."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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` → `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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/batman-adv/types.h"
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],
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"versions": [
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{
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"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7",
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"lessThan": "4c4c2f340f4c27373bfcac8dc5032ce7bb474e47",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7",
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"lessThan": "33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7",
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"lessThan": "3c96dff00998314983b68a3e7caac07a66ebe496",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7",
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"lessThan": "32edd2a28e112064020a2f319a8cb8a9e5a09767",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7",
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"lessThan": "4dab98961426d0cf6a1599cda6950b7596ca2fcd",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7",
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"lessThan": "730de8733dd90f70d7580a9b329b971f8e1474a2",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7",
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"lessThan": "ed28ead3420c373a7928622f114bc6168075d1e1",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a73105b8d4c765d9ebfb664d0a66802127d8e4c7",
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"lessThan": "b64963a2ceeb7529310b6cf253a1e540784422f4",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/batman-adv/types.h"
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],
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"versions": [
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{
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"version": "3.1",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "3.1",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.258",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.209",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.175",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.142",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.92",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.34",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0.11",
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.1",
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"versionEndExcluding": "5.10.258"
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/4c4c2f340f4c27373bfcac8dc5032ce7bb474e47"
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},
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{
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"url": "https://git.kernel.org/stable/c/33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430"
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},
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{
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"url": "https://git.kernel.org/stable/c/3c96dff00998314983b68a3e7caac07a66ebe496"
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},
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{
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"url": "https://git.kernel.org/stable/c/32edd2a28e112064020a2f319a8cb8a9e5a09767"
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},
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{
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"url": "https://git.kernel.org/stable/c/4dab98961426d0cf6a1599cda6950b7596ca2fcd"
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},
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{
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"url": "https://git.kernel.org/stable/c/730de8733dd90f70d7580a9b329b971f8e1474a2"
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},
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{
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"url": "https://git.kernel.org/stable/c/ed28ead3420c373a7928622f114bc6168075d1e1"
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},
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{
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"url": "https://git.kernel.org/stable/c/b64963a2ceeb7529310b6cf253a1e540784422f4"
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}
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],
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"title": "batman-adv: tt: fix negative tt_buff_len",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |