CVE-2026-64088

In the Linux kernel, the following vulnerability has been resolved: batman-adv: tt: fix negative tt_buff_len batadv_orig_node::tt_buff_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_other_tt_response(), tt_buff_len is temporarily widened to s32. The incorrectly negative s16 value propagates into the s32, causing batadv_tt_prepare_tvlv_global_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_other_tt_response().

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector ADJACENT_NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/32edd2a28e112064020a2f319a8cb8a9e5a09767
https://git.kernel.org/stable/c/33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430
https://git.kernel.org/stable/c/3c96dff00998314983b68a3e7caac07a66ebe496
https://git.kernel.org/stable/c/4c4c2f340f4c27373bfcac8dc5032ce7bb474e47
https://git.kernel.org/stable/c/4dab98961426d0cf6a1599cda6950b7596ca2fcd
https://git.kernel.org/stable/c/730de8733dd90f70d7580a9b329b971f8e1474a2
https://git.kernel.org/stable/c/b64963a2ceeb7529310b6cf253a1e540784422f4
https://git.kernel.org/stable/c/ed28ead3420c373a7928622f114bc6168075d1e1

Configurations

No configuration.

History

20 Jul 2026, 15:17

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 8.8

19 Jul 2026, 16:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-19 16:17

Updated : 2026-07-20 15:17

NVD link : CVE-2026-64088

Mitre link : CVE-2026-64088

CVE.ORG link : CVE-2026-64088

JSON object : View

Products Affected

No product.

CWE

No CWE.

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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()."}], "lastModified": "2026-07-20T15:17:08.030", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}