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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.28%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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().
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.28% probability · 21th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/32edd2a28e112064020a2f319a8cb8a9e5a09767Patch
- https://git.kernel.org/stable/c/33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430Patch
- https://git.kernel.org/stable/c/3c96dff00998314983b68a3e7caac07a66ebe496Patch
- https://git.kernel.org/stable/c/4c4c2f340f4c27373bfcac8dc5032ce7bb474e47Patch
- https://git.kernel.org/stable/c/4dab98961426d0cf6a1599cda6950b7596ca2fcdPatch
- https://git.kernel.org/stable/c/730de8733dd90f70d7580a9b329b971f8e1474a2Patch
- https://git.kernel.org/stable/c/b64963a2ceeb7529310b6cf253a1e540784422f4Patch
- https://git.kernel.org/stable/c/ed28ead3420c373a7928622f114bc6168075d1e1Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.