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CVE-2026-52919— batman-adv: fix tp_meter counter underflow during shutdown

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batman-adv中tp_meter计数器在关闭过程中存在下溢，可能导致sender kthread无限循环，进而在接口移除时导致释放后重用。以下版本受到影响：4.8版本。

CVSS 7.8 · High EPSS 0.12% · P2

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 33a3bb4a3345bb511f9c69c913da95d4693e2a4e< e75e2ab463b5b34df6b98f94d740aff327ce9f6b affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< abae88fa254f2981d39ac003a7b302528a22af64 affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< c66d20a3ff095e3f000551d208ec2606616db15c affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< c1bac194733aabd731aafa6a01350c229e187dba affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< 01cefc5923889e29dbb5f281c3d457714ceb9c00 affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< 90ae3eae06b7b8ab9f6250b9497c860915b4c17b affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< aeae11c5dad9cd0d50723890bdd866f8e6db2e7d affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< 94f3b133168d1c49895e7cc6afbcf1cc0b354602 affected
… +10 more rows
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I. Basic Information for CVE-2026-52919

Vulnerability Information
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Vulnerability Title
batman-adv: fix tp_meter counter underflow during shutdown
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: fix tp_meter counter underflow during shutdown batadv_tp_sender_shutdown() unconditionally decrements the "sending" atomic counter. If multiple paths (e.g. timeout, user cancel, and normal finish) call this function, the counter can underflow to -1. Since the sender logic treats any non-zero value as "still sending", a negative value causes the sender kthread to loop indefinitely. This leads to a use-after-free when the interface is removed while the zombie thread is still active. Fix this by using atomic_xchg() to ensure the counter only transitions from 1 to 0 once. [sven: added missing change in batadv_tp_send]
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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batman-adv中tp_meter计数器在关闭过程中存在下溢，可能导致sender kthread无限循环，进而在接口移除时导致释放后重用。以下版本受到影响：4.8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 33a3bb4a3345bb511f9c69c913da95d4693e2a4e ~ e75e2ab463b5b34df6b98f94d740aff327ce9f6b -
Linux Linux 4.8 -

II. Public POCs for CVE-2026-52919

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III. Intelligence Information for CVE-2026-52919

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Patches & Fixes for CVE-2026-52919 (8)

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

CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52989 9.8 CRITICAL nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
CVE-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()

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-2026-52919

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