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CVE-2026-64096— batman-adv: mcast: fix use-after-free in orig_node RCU release

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 3.15版本存在安全漏洞，该漏洞源于batman-adv的mcast模块在orig_node RCU释放时未等待RCU宽限期即释放条目，可能导致释放后重用，进而访问已释放的内存。以下版本受到影响：3.15版本。

CVSS 8.8 · High EPSS 0.40% · P33

Possible ATT&CK Techniques 1 AI

T1047 · Windows Management Instrumentation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ab49886e3da73b6b35ece21006e191910427bb30< ff3a4487ead475e27b43280b8ee3d8464fe280e1 affected
ab49886e3da73b6b35ece21006e191910427bb30< 78a63fb2f7d5630d1c1f2859a20d4e4226863b41 affected
ab49886e3da73b6b35ece21006e191910427bb30< ced48f55bac73f0822eae90509e51b42b4f646c8 affected
ab49886e3da73b6b35ece21006e191910427bb30< 70bcb678561f0fb58f33270fc73f12f3be72b878 affected
ab49886e3da73b6b35ece21006e191910427bb30< aef897c9d2dd0d9339167fb82b62beff68d076cb affected
ab49886e3da73b6b35ece21006e191910427bb30< 8a3707653ab658e082ccd992e92594e01b09a3fc affected
ab49886e3da73b6b35ece21006e191910427bb30< edfb1e094104a50f931553dc82ac59246569fd32 affected
ab49886e3da73b6b35ece21006e191910427bb30< 20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc affected
… +10 more rows
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I. Basic Information for CVE-2026-64096

Vulnerability Information
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Vulnerability Title
batman-adv: mcast: fix use-after-free in orig_node RCU release
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: mcast: fix use-after-free in orig_node RCU release batadv_mcast_purge_orig() removes entries from RCU-protected hlists but does not wait for an RCU grace period before returning. Concurrent RCU readers may still accesses references to those entries at the point of removal. RCU-protected readers trying to operate on entries like orig->mcast_want_all_ipv6_node will then access already freed memory. Fix this by moving batadv_mcast_purge_orig() to batadv_orig_node_release(), just before the call_rcu() invocation. This ensures RCU readers that were active at purge time have drained before the orig_node memory is reclaimed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/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基金会开源的一款操作系统内核。 Linux kernel 3.15版本存在安全漏洞，该漏洞源于batman-adv的mcast模块在orig_node RCU释放时未等待RCU宽限期即释放条目，可能导致释放后重用，进而访问已释放的内存。以下版本受到影响：3.15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 ab49886e3da73b6b35ece21006e191910427bb30 ~ ff3a4487ead475e27b43280b8ee3d8464fe280e1 -
Linux Linux 3.15 -

II. Public POCs for CVE-2026-64096

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III. Intelligence Information for CVE-2026-64096

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Patches & Fixes for CVE-2026-64096 (7)

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-2026-63978 9.8 CRITICAL net/handshake: Drain pending requests at net namespace exit
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-2026-64089 9.8 CRITICAL batman-adv: tt: fix negative last_changeset_len
CVE-2026-64091 9.8 CRITICAL batman-adv: tt: fix TOCTOU race for reported vlans
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-64037 9.8 CRITICAL wifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled
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-2026-63888 9.8 CRITICAL scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-64136 9.8 CRITICAL smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-64056 9.8 CRITICAL net: ethernet: cortina: Make RX SKB per-port
CVE-2026-64102 9.8 CRITICAL RDMA/siw: Reject MPA FPDU length underflow before signed receive math
CVE-2026-64055 9.8 CRITICAL net: ethernet: cortina: Carry over frag counter

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-2026-64096

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