Description
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().
Affected products
linux: linux kernel
References8
- git.kernel.org/stable/c/32edd2a28e112064020a2f319a8cb8a9e5a09767 Patch
- git.kernel.org/stable/c/33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430 Patch
- git.kernel.org/stable/c/3c96dff00998314983b68a3e7caac07a66ebe496 Patch
- git.kernel.org/stable/c/4c4c2f340f4c27373bfcac8dc5032ce7bb474e47 Patch
- git.kernel.org/stable/c/4dab98961426d0cf6a1599cda6950b7596ca2fcd Patch
- git.kernel.org/stable/c/730de8733dd90f70d7580a9b329b971f8e1474a2 Patch
- git.kernel.org/stable/c/b64963a2ceeb7529310b6cf253a1e540784422f4 Patch
- git.kernel.org/stable/c/ed28ead3420c373a7928622f114bc6168075d1e1 Patch
Metrics
- CVSS 3.1
-
8.8
HIGH
Score source: CNA
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 21 · as of 14 November 2026
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