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CVE-2026-52916— batman-adv: frag: disallow unicast fragment in fragment

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存在安全漏洞，该漏洞源于batman-adv片段处理逻辑问题，允许恶意发送者构造嵌套的BATADV_UNICAST_FRAG数据包，导致内核栈耗尽。

AI Predicted 5.5 Difficulty: Easy EPSS 0.16% · P6

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 610bfc6bc99bc83680d190ebc69359a05fc7f605< 0c208fa3859e3a33a1c38bebc41d021166e94ac8 affected
610bfc6bc99bc83680d190ebc69359a05fc7f605< bcda4814dc6524283c0b958882cb963d75fe411d affected
610bfc6bc99bc83680d190ebc69359a05fc7f605< aea54d0bbe156d5ab7d00d68f66149ff41f4612a affected
610bfc6bc99bc83680d190ebc69359a05fc7f605< b54e459cf86943583c1aa2ee3081874e7ab1f5f3 affected
610bfc6bc99bc83680d190ebc69359a05fc7f605< 5418be6c2e117bf8a316582795a8e3ff90f45e5d affected
610bfc6bc99bc83680d190ebc69359a05fc7f605< 5895ad21c7059a652da83fb817510f7a1e962abf affected
610bfc6bc99bc83680d190ebc69359a05fc7f605< 7138c35c9ad39a2fca6264af6b87466471f04ffc affected
610bfc6bc99bc83680d190ebc69359a05fc7f605< bc62216dc8e221e3781afa14430f45208bfa9af9 affected
… +10 more rows
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I. Basic Information for CVE-2026-52916

Vulnerability Information
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Vulnerability Title
batman-adv: frag: disallow unicast fragment in fragment
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: frag: disallow unicast fragment in fragment batadv_frag_skb_buffer() is called by batadv_batman_skb_recv() when a BATADV_UNICAST_FRAG packet is received. Once all fragments are collected and the packet is reassembled, batadv_recv_frag_packet() calls batadv_batman_skb_recv() again to process the defragmented payload. A malicious sender can craft a BATADV_UNICAST_FRAG packet whose reassembled payload is itself a BATADV_UNICAST_FRAG packet (matryoshka-style nesting). Each nesting level recurses through batadv_batman_skb_recv() without bound, growing the kernel stack until it is exhausted. Since refragmentation or fragments in fragments are not actually allowed, discard all packets which are still BATADV_UNICAST_FRAG packets after the defragmentation process.
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基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于batman-adv片段处理逻辑问题，允许恶意发送者构造嵌套的BATADV_UNICAST_FRAG数据包，导致内核栈耗尽。
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 610bfc6bc99bc83680d190ebc69359a05fc7f605 ~ 0c208fa3859e3a33a1c38bebc41d021166e94ac8 -
Linux Linux 3.13 -

II. Public POCs for CVE-2026-52916

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III. Intelligence Information for CVE-2026-52916

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Patches & Fixes for CVE-2026-52916 (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-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
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-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
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-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching
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()

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-2026-52916

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