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CVE-2026-64090— batman-adv: tt: avoid empty VLAN responses

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存在安全漏洞，该漏洞源于batman-adv在全局TT状态回复时可能发送空VLAN响应。以下版本受到影响：3.13版本。

AI Predicted 5.3 Difficulty: Theoretical EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1003 · OS Credential Dumping

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b< 1f467d9a095211d3f77e8ff1bee90e73ffe01c64 affected
7ea7b4a142758deaf46c1af0ca9ceca6dd55138b< 9a02c8fc963ddeecb5d8788be0740c1869fc54b7 affected
7ea7b4a142758deaf46c1af0ca9ceca6dd55138b< ea4f757641430bcc8322772e161453c4db5ecb64 affected
7ea7b4a142758deaf46c1af0ca9ceca6dd55138b< 99f17d1cdb371cbd037975239b321f346d38f6d2 affected
7ea7b4a142758deaf46c1af0ca9ceca6dd55138b< cfb30645280a2131e46cbd1b9a38cfd3ff893f12 affected
7ea7b4a142758deaf46c1af0ca9ceca6dd55138b< b93ca6012712ecab2b551e120d7c95038d6a89e5 affected
7ea7b4a142758deaf46c1af0ca9ceca6dd55138b< ab26e346322648f5c39de017d9723c9256284fce affected
7ea7b4a142758deaf46c1af0ca9ceca6dd55138b< fa1bd704940b5bcbc32c0b28db9167405c8ee5e0 affected
… +10 more rows
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I. Basic Information for CVE-2026-64090

Vulnerability Information
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Vulnerability Title
batman-adv: tt: avoid empty VLAN responses
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: tt: avoid empty VLAN responses The commit 16116dac2339 ("batman-adv: prevent TT request storms by not sending inconsistent TT TLVLs") added checks to the local (direct) TT response code. But the response can also be done indirectly by another node using the global TT state. To avoid such inconsistency states reported in the original fix, also avoid sending empty VLANs for replies from the global TT state.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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存在安全漏洞，该漏洞源于batman-adv在全局TT状态回复时可能发送空VLAN响应。以下版本受到影响：3.13版本。
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 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b ~ 1f467d9a095211d3f77e8ff1bee90e73ffe01c64 -
Linux Linux 3.13 -

II. Public POCs for CVE-2026-64090

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III. Intelligence Information for CVE-2026-64090

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Patches & Fixes for CVE-2026-64090 (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-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-63994 9.8 CRITICAL tunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames
CVE-2026-64142 9.8 CRITICAL ksmbd: close durable scavenger races against m_fp_list lookups
CVE-2026-63993 9.8 CRITICAL vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()
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-2026-63825 9.8 CRITICAL gcov: use atomic counter updates to fix concurrent access crashes
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-63886 9.8 CRITICAL scsi: target: iscsi: Validate CHAP_R length before base64 decode
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-64091 9.8 CRITICAL batman-adv: tt: fix TOCTOU race for reported vlans
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-63978 9.8 CRITICAL net/handshake: Drain pending requests at net namespace exit
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-64132 9.8 CRITICAL ipv6: ioam: refresh hdr pointer before ioam6_event()
CVE-2026-64136 9.8 CRITICAL smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64090

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