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CVE-2026-64088— batman-adv: tt: fix negative tt_buff_len

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 3.1版本存在安全漏洞，该漏洞源于batadv_orig_node::tt_buff_len声明为s16，但赋值大于32767时导致符号扩展问题，造成分配完整缓冲区但仅部分填充，其余位未初始化。

CVSS 8.8 · High EPSS 0.41% · P34

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux a73105b8d4c765d9ebfb664d0a66802127d8e4c7< 4c4c2f340f4c27373bfcac8dc5032ce7bb474e47 affected
a73105b8d4c765d9ebfb664d0a66802127d8e4c7< 33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430 affected
a73105b8d4c765d9ebfb664d0a66802127d8e4c7< 3c96dff00998314983b68a3e7caac07a66ebe496 affected
a73105b8d4c765d9ebfb664d0a66802127d8e4c7< 32edd2a28e112064020a2f319a8cb8a9e5a09767 affected
a73105b8d4c765d9ebfb664d0a66802127d8e4c7< 4dab98961426d0cf6a1599cda6950b7596ca2fcd affected
a73105b8d4c765d9ebfb664d0a66802127d8e4c7< 730de8733dd90f70d7580a9b329b971f8e1474a2 affected
a73105b8d4c765d9ebfb664d0a66802127d8e4c7< ed28ead3420c373a7928622f114bc6168075d1e1 affected
a73105b8d4c765d9ebfb664d0a66802127d8e4c7< b64963a2ceeb7529310b6cf253a1e540784422f4 affected
… +10 more rows
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I. Basic Information for CVE-2026-64088

Vulnerability Information
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Vulnerability Title
batman-adv: tt: fix negative tt_buff_len
Source: CVE Program / CVE List V5
Vulnerability 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().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 3.1版本存在安全漏洞，该漏洞源于batadv_orig_node::tt_buff_len声明为s16，但赋值大于32767时导致符号扩展问题，造成分配完整缓冲区但仅部分填充，其余位未初始化。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux a73105b8d4c765d9ebfb664d0a66802127d8e4c7 ~ 4c4c2f340f4c27373bfcac8dc5032ce7bb474e47 -
Linux Linux 3.1 -

II. Public POCs for CVE-2026-64088

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III. Intelligence Information for CVE-2026-64088

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Patches & Fixes for CVE-2026-64088 (8)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-53399 9.8 CRITICAL nfsd: release layout stid on setlease failure
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-64089 9.8 CRITICAL batman-adv: tt: fix negative last_changeset_len
CVE-2026-64091 9.8 CRITICAL batman-adv: tt: fix TOCTOU race for reported vlans
CVE-2026-63924 9.8 CRITICAL ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-64037 9.8 CRITICAL wifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled
CVE-2026-63888 9.8 CRITICAL scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-64136 9.8 CRITICAL smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-64056 9.8 CRITICAL net: ethernet: cortina: Make RX SKB per-port
CVE-2026-64102 9.8 CRITICAL RDMA/siw: Reject MPA FPDU length underflow before signed receive math
CVE-2026-64055 9.8 CRITICAL net: ethernet: cortina: Carry over frag counter

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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