cve-2026-64089
CRITICAL CVSS 9.8 opencve
Description
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().
Timeline
- Published
- 2026-07-19 16:17 UTC
- Last Modified
- 2026-08-11
CVSS Details
CVSS details not available.
Affected Products
No product information available.
Weaknesses (CWE)
CVSS metrics
| Version | Base | Severity | Vector | Exploitability | Impact | Source |
|---|---|---|---|---|---|---|
| 3.1 | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
mitre | ||
| 3.1 | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
nvd | ||
| 3.1 | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
opencve |
References
No references available.
Linked Vulnerabilities
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"metrics": {
"cvssV2_0": {
"data": {},
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},
"cvssV3_0": {
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},
"cvssV3_1": {
"data": {
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"vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
},
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},
"cvssV4_0": {
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},
"epss": {
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},
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},
"kev": {
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},
"ssvc": {
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},
"threat_severity": {
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}
},
"references": {
"data": [
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"https://git.kernel.org/stable/c/22d59c72f4a47ffec121d0610f70d0d70c3c11c8",
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"https://www.cve.org/CVERecord?id=CVE-2026-64089"
],
"providers": [
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]
},
"title": {
"data": "batman-adv: tt: fix negative last_changeset_len",
"provider": "mitre"
},
"updated": {
"data": "2026-08-11T15:33:55.310000+00:00",
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},
"vendors": {
"data": [
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],
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},
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],
"providers": [
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]
}
},
"redhat": {
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"created": "2026-07-19T00:00:00+00:00",
"description": "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.",
"metrics": {
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},
"redhat_repo_path": "2026/CVE-2026-64089.json",
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"https://www.cve.org/CVERecord?id=CVE-2026-64089"
],
"title": "kernel: batman-adv: tt: fix negative last_changeset_len",
"updated": "2026-07-19T00:00:00+00:00",
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}
}
Enrichment data
Aggregated bundle (all enrichments)