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CVE-2026-63834— batman-adv: tp_meter: restrict number of unacked list entries

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 4.8版本存在安全漏洞，该漏洞源于未限制unacked_list列表条目数量，可能导致攻击者发送小长度消息及特定seqno和间隙，迫使接收端分配更多条目，造成内存耗尽或CPU开销增加。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.17% · P7

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 33a3bb4a3345bb511f9c69c913da95d4693e2a4e< 31a88792bfba142be3c9521538c1db805677381f affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< 1111a3381bca2d1f084a07686bc783af5ab23df7 affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< 1c616b0be4bd8399d485e25e91859373b95d6013 affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< f8c499fd275e59203b77fca76ae6ef2d096c2133 affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< c6231d628d06d841bc1617b2f7034f5f39876b16 affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< 2233787658db859f0a9b83cb397cf783bb8be865 affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< 1fb8762600a393d1caccd63be5d07e1756982d68 affected
33a3bb4a3345bb511f9c69c913da95d4693e2a4e< e7c775110e1858e5a7471a23a9c9658c0af9df89 affected
… +10 more rows
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I. Basic Information for CVE-2026-63834

Vulnerability Information
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Vulnerability Title
batman-adv: tp_meter: restrict number of unacked list entries
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: tp_meter: restrict number of unacked list entries When the unacked_list is unbound, an attacker could send messages with small lengths and appropriated seqno + gaps to force the receiver to allocate more and more unacked_list entries. And the end either causing an out-of-memory situation or increase the management overhead for the (large) list that significant portions of CPU cycles are wasted in searching through the list. When limiting the list to a specific number, it is important to still correctly add a new entry to the list. But if the list became larger than the limit, the last entry of the list (with the highest seqno) must be dropped to still allow the earlier seqnos to finish and therefore to continue the process. Otherwise, the process might get stuck with too high seqnos which are not handled by batadv_tp_ack_unordered().
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基金会开源的一款操作系统内核。 Linux kernel 4.8版本存在安全漏洞，该漏洞源于未限制unacked_list列表条目数量，可能导致攻击者发送小长度消息及特定seqno和间隙，迫使接收端分配更多条目，造成内存耗尽或CPU开销增加。
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 ~ 31a88792bfba142be3c9521538c1db805677381f -
Linux Linux 4.8 -

II. Public POCs for CVE-2026-63834

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III. Intelligence Information for CVE-2026-63834

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Patches & Fixes for CVE-2026-63834 (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-2026-64056 9.8 CRITICAL net: ethernet: cortina: Make RX SKB per-port
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
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-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-63886 9.8 CRITICAL scsi: target: iscsi: Validate CHAP_R length before base64 decode
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames
CVE-2026-64150 9.8 CRITICAL netfilter: nft_inner: release local_lock before re-enabling softirqs
CVE-2026-63924 9.8 CRITICAL ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-64132 9.8 CRITICAL ipv6: ioam: refresh hdr pointer before ioam6_event()
CVE-2026-64037 9.8 CRITICAL wifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled
CVE-2026-63978 9.8 CRITICAL net/handshake: Drain pending requests at net namespace exit
CVE-2026-63825 9.8 CRITICAL gcov: use atomic counter updates to fix concurrent access crashes
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-63857 9.8 CRITICAL net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-64046 9.8 CRITICAL net: tls: prevent chain-after-chain in plain text SG

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-63834

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