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CVE-2026-52931— batman-adv: tp_meter: avoid use of uninit sender vars

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基金会开源的操作系统Linux所使用的内核。 Linux kernel 4.8版本存在安全漏洞，该漏洞源于未初始化的发送方变量被访问，可能导致未定义行为。

CVSS 9.8 · Critical EPSS 0.40% · P33

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 33a3bb4a3345bb511f9c69c913da95d4693e2a4e< 0e388af04b3958b178a1b979527f93eb46ea1fee affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< 1a21c055f66e78973712a4a1be2a554f1ee2e4f4 affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< 9884c9c02d3c90e9215db3c5128f59045d20ae91 affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< 53f931e0146ae5bdab4cba302646827d06b3794b affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< ecdaa3e4d91040206afe21bc8a0d1198a0971ff3 affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< dc2ae5fbd2dadc26735092f140b246841d969a11 affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< 85397e48afe6be83ffca5ad3f4792296bfc81d3d affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< 6c65cf23d4c6170fcf5714c32aa64689718cb142 affected
… +10 more rows
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I. Basic Information for CVE-2026-52931

Vulnerability Information
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Vulnerability Title
batman-adv: tp_meter: avoid use of uninit sender vars
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: tp_meter: avoid use of uninit sender vars batadv_tp_recv_ack() and batadv_tp_stop() are only valid for tp_vars in the BATADV_TP_SENDER role. When called with a BATADV_TP_RECEIVER role, it proceeds to read sender-only members that were never initialized, leading to undefined behavior. This can be triggered when a node that is currently acting as a receiver in an ongoing tp_meter session receives a malicious ACK packet. Guard against this by checking tp_vars->role immediately after the lookup and bailing out if it is not BATADV_TP_SENDER, before any of those members are accessed.
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基金会开源的操作系统Linux所使用的内核。 Linux kernel 4.8版本存在安全漏洞，该漏洞源于未初始化的发送方变量被访问，可能导致未定义行为。
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 33a3bb4a3345bb511f9c69c913da95d4693e2a4e ~ 0e388af04b3958b178a1b979527f93eb46ea1fee -
Linux Linux 4.8 -

II. Public POCs for CVE-2026-52931

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III. Intelligence Information for CVE-2026-52931

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Patches & Fixes for CVE-2026-52931 (8)

Same Patch Batch · Linux · 2026-06-24 · 219 CVEs total

CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-52989 9.8 CRITICAL nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching
CVE-2026-52968 8.8 HIGH KVM: s390: pci: fix GAIT table indexing due to double-scaling pointer arithmetic

Showing top 20 of 219 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-52931

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