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().
No affected software listed.
- 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
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A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.
CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.
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