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CVE-2026-64091— batman-adv: tt: fix TOCTOU race for reported vlans

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中针对报告的VLAN存在TOCTOU竞争条件，可能导致缓冲区大小计算错误从而引发空间分配不足的问题。

CVSS 9.8 · Critical EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1207 · Rogue Domain Controller

Affected Version Matrix 26

VendorProduct Version RangeStatus
Linux Linux 16116dac23396e73c01eeee97b102e4833a4b205< e4236bf3ec8d6bb15d0d8d825dcf9933a7d6666b affected
16116dac23396e73c01eeee97b102e4833a4b205< 724a8eb4155669797c96b70d70e354284ae3b5a8 affected
16116dac23396e73c01eeee97b102e4833a4b205< 211ea59988e1cba43cb0367ad65d379b56f9c3bd affected
16116dac23396e73c01eeee97b102e4833a4b205< 65a1e67339aa8c95ac544b796946af388930ee23 affected
16116dac23396e73c01eeee97b102e4833a4b205< b4d4efd4e351593c81e9293d4b4408d244fa5ee7 affected
16116dac23396e73c01eeee97b102e4833a4b205< 4cc85aec8d3c9ab4dc716dc9f1ed36fca16b227f affected
16116dac23396e73c01eeee97b102e4833a4b205< 9a9c859457bc440a55773e01ff18b1bb5bab6836 affected
16116dac23396e73c01eeee97b102e4833a4b205< 94d27005016be15ffc638b2ecbc4d58805ad7b48 affected
… +18 more rows
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I. Basic Information for CVE-2026-64091

Vulnerability Information
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Vulnerability Title
batman-adv: tt: fix TOCTOU race for reported vlans
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: tt: fix TOCTOU race for reported vlans The local TT based TVLV is generated by first checking the number of VLANs which have at least one TT entry. A new buffer with the correct size for the VLANs is then allocated. Only then, the list of VLANs s used to fill the VLAN entries in the buffer. During this time, the meshif_vlan_list_lock is held. But the actual number of TT entries of each VLAN can still increase during this time - just not the number of VLANs in the list. But the prefilter used in the buffer size calculation might still cause an increase of the number of VLANs which need to be stored. Simply because a VLAN might now suddenly have at least one entry when it had none in the pre-alloc check - and then needs to occupy space which was not allocated. It is better to overestimate the buffer size at the beginning and then fill the buffer only with the VLANs which are not empty.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/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存在安全漏洞，该漏洞源于batman-adv中针对报告的VLAN存在TOCTOU竞争条件，可能导致缓冲区大小计算错误从而引发空间分配不足的问题。
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 16116dac23396e73c01eeee97b102e4833a4b205 ~ e4236bf3ec8d6bb15d0d8d825dcf9933a7d6666b -
Linux Linux 4.17 -

II. Public POCs for CVE-2026-64091

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III. Intelligence Information for CVE-2026-64091

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Patches & Fixes for CVE-2026-64091 (7)

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-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-63924 9.8 CRITICAL ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()
CVE-2026-64037 9.8 CRITICAL wifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled
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-2026-63888 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-2026-64102 9.8 CRITICAL RDMA/siw: Reject MPA FPDU length underflow before signed receive math
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-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames
CVE-2026-64061 9.8 CRITICAL netfs: Fix early put of sink folio in netfs_read_gaps()

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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