SECUFOCUSNOW
Home›CVE index›CVE-2026-64088
Review reviewHigh

CVE-2026-64088

Linux

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 rema...

CVSS
8.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.8

Vulnerability overview

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 rema...

Affected product and versions

Product
Linux
Affected versions
>= a73105b8d4c765d9ebfb664d0a66802127d8e4c7 < 4c4c2f340f4c27373bfcac8dc5032ce7bb474e47, >= a73105b8d4c765d9ebfb664d0a66802127d8e4c7 < 33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430, >= a73105b8d4c765d9ebfb664d0a66802127d8e4c7 < 3c96dff00998314983b68a3e7caac07a66ebe496, >= a73105b8d4c765d9ebfb664d0a66802127d8e4c7 < 32edd2a28e112064020a2f319a8cb8a9e5a09767, >= a73105b8d4c765d9ebfb664d0a66802127d8e4c7 < 4dab98961426d0cf6a1599cda6950b7596ca2fcd, >= a73105b8d4c765d9ebfb664d0a66802127d8e4c7 < 730de8733dd90f70d7580a9b329b971f8e1474a2, >= a73105b8d4c765d9ebfb664d0a66802127d8e4c7 < ed28ead3420c373a7928622f114bc6168075d1e1, >= a73105b8d4c765d9ebfb664d0a66802127d8e4c7 < b64963a2ceeb7529310b6cf253a1e540784422f4, >= 3.1
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2026-64088 — Linux | SECUFOCUS NOW