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CVE-2026-64095— batman-adv: bla: avoid double decrement of bla.num_requests

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 3.5版本存在安全漏洞，该漏洞源于batman-adv bla对bla.num_requests的双重减操作处理不当（TOCTOU竞争条件），可能导致并发运行时出现计数不一致。

CVSS 7.1 · High EPSS 0.41% · P34

Possible ATT&CK Techniques 1 AI

T1689 · Downgrade Attack

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 23721387c409087fd3b97e274f34d3ddc0970b74< 1f013bc94154f2e78e97d0296175664224c796e0 affected
23721387c409087fd3b97e274f34d3ddc0970b74< 5328b95960774f2e189f22485616bc7b8eb2f7e3 affected
23721387c409087fd3b97e274f34d3ddc0970b74< 8ff9c59d1b7b48c2596878341a5310f32895d52b affected
23721387c409087fd3b97e274f34d3ddc0970b74< a9393751ecf7e9096f93cb6eed02db4f79125765 affected
23721387c409087fd3b97e274f34d3ddc0970b74< 461f1e3dfb888701895b766446c55db2b10db705 affected
23721387c409087fd3b97e274f34d3ddc0970b74< 45384612f29692fbf0c770200361a7acff90125c affected
23721387c409087fd3b97e274f34d3ddc0970b74< 65497ad155a3246df177b5ef662cd6e5a32cb470 affected
23721387c409087fd3b97e274f34d3ddc0970b74< 83ab69bd12b80f6ea169c8bea6977701b53a043d affected
… +10 more rows
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I. Basic Information for CVE-2026-64095

Vulnerability Information
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Vulnerability Title
batman-adv: bla: avoid double decrement of bla.num_requests
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: avoid double decrement of bla.num_requests The bla.num_requests is increased when no request_sent was in progress. And it is decremented in various places (announcement was received, backbone is purged, periodic work). But the check if the request_sent is actually set to a specific state and the atomic_dec/_inc are not safe because they are not atomic (TOCTOU) and multiple such code portions can run concurrently. At the same time, it is necessary to modify request_sent (state) and bla.num_requests atomically. Otherwise batadv_bla_send_request() might set request_sent to 1 and is interrupted. batadv_handle_announce() can then set request_sent back to 0 and decrement num_requests before batadv_bla_send_request() incremented it. The two operations must therefore be locked. And since state (request_sent) and wait_periods are only accessed inside this lock, they can be converted to simpler datatypes. And to avoid that the bla.num_requests is touched by a parallel running context with a valid backbone_gw reference after batadv_bla_purge_backbone_gw() ran, a third state "stopped" is required to correctly signal that a backbone_gw is in the state of being cleaned up.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/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 3.5版本存在安全漏洞，该漏洞源于batman-adv bla对bla.num_requests的双重减操作处理不当（TOCTOU竞争条件），可能导致并发运行时出现计数不一致。
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 23721387c409087fd3b97e274f34d3ddc0970b74 ~ 1f013bc94154f2e78e97d0296175664224c796e0 -
Linux Linux 3.5 -

II. Public POCs for CVE-2026-64095

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III. Intelligence Information for CVE-2026-64095

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Patches & Fixes for CVE-2026-64095 (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-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
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-2026-64047 9.8 CRITICAL net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring
CVE-2026-64102 9.8 CRITICAL RDMA/siw: Reject MPA FPDU length underflow before signed receive math
CVE-2026-64056 9.8 CRITICAL net: ethernet: cortina: Make RX SKB per-port
CVE-2026-64061 9.8 CRITICAL netfs: Fix early put of sink folio in netfs_read_gaps()
CVE-2026-64046 9.8 CRITICAL net: tls: prevent chain-after-chain in plain text SG
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-2026-64066 9.8 CRITICAL netfs: Fix netfs_read_to_pagecache() to pause on subreq failure
CVE-2026-63924 9.8 CRITICAL ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()
CVE-2026-64089 9.8 CRITICAL batman-adv: tt: fix negative last_changeset_len
CVE-2026-64136 9.8 CRITICAL smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
CVE-2026-63886 9.8 CRITICAL scsi: target: iscsi: Validate CHAP_R length before base64 decode
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-64122 9.8 CRITICAL net/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-63825 9.8 CRITICAL gcov: use atomic counter updates to fix concurrent access crashes

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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