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CVE-2025-21759— ipv6: mcast: extend RCU protection in igmp6_send()

Quick assessment

Affected
Linux Linux
Exploitation
High exploitation probability; assess promptly
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在资源管理错误漏洞，该漏洞源于igmp6_send函数未使用RCU保护，可能导致释放后重用。

CVSS 7.8 · High EPSS 7.80% · P95

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551< 638e8fe3563a82f298fe537a28d5342a97278cf1 affected
b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551< 6901bbb169e3add6c037218d996790cef6b3d650 affected
b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551< 7e0a818ecc4d62e7fb668ea02de0bfe8ba0b7dff affected
b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551< 81b25a07ebf53f9ef4ca8f3d96a8ddb94561dd5a affected
b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551< 0bf8e2f3768629d437a32cb824149e6e98254381 affected
b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551< 8e92d6a413feaf968a33f0b439ecf27404407458 affected
b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551< 087c1faa594fa07a66933d750c0b2610aa1a2946 affected
2.6.26 affected
… +8 more rows
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I. Basic Information for CVE-2025-21759

Vulnerability Information
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Vulnerability Title
ipv6: mcast: extend RCU protection in igmp6_send()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: extend RCU protection in igmp6_send() igmp6_send() can be called without RTNL or RCU being held. Extend RCU protection so that we can safely fetch the net pointer and avoid a potential UAF. Note that we no longer can use sock_alloc_send_skb() because ipv6.igmp_sk uses GFP_KERNEL allocations which can sleep. Instead use alloc_skb() and charge the net->ipv6.igmp_sk socket under RCU protection.
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 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在资源管理错误漏洞，该漏洞源于igmp6_send函数未使用RCU保护，可能导致释放后重用。
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 b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551 ~ 638e8fe3563a82f298fe537a28d5342a97278cf1 -
Linux Linux 2.6.26 -

II. Public POCs for CVE-2025-21759

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III. Intelligence Information for CVE-2025-21759

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Patches & Fixes for CVE-2025-21759 (7)

Same Patch Batch · Linux · 2025-02-27 · 177 CVEs total

CVE-2025-21805 9.8 CRITICAL RDMA/rtrs: Add missing deinit() call
CVE-2025-21707 9.8 CRITICAL mptcp: consolidate suboption status
CVE-2025-21748 9.8 CRITICAL ksmbd: fix integer overflows on 32 bit systems
CVE-2025-21796 9.8 CRITICAL nfsd: clear acl_access/acl_default after releasing them
CVE-2024-58006 9.6 CRITICAL PCI: dwc: ep: Prevent changing BAR size/flags in pci_epc_set_bar()
CVE-2024-57997 8.8 HIGH wifi: wcn36xx: fix channel survey memory allocation size
CVE-2024-57995 8.8 HIGH wifi: ath12k: fix read pointer after free in ath12k_mac_assign_vif_to_vdev()
CVE-2024-57999 8.8 HIGH powerpc/pseries/iommu: IOMMU incorrectly marks MMIO range in DDW
CVE-2025-21735 8.8 HIGH NFC: nci: Add bounds checking in nci_hci_create_pipe()
CVE-2025-21710 8.2 HIGH tcp: correct handling of extreme memory squeeze
CVE-2025-21760 8.1 HIGH ndisc: extend RCU protection in ndisc_send_skb()
CVE-2024-57973 8.1 HIGH rdma/cxgb4: Prevent potential integer overflow on 32bit
CVE-2025-21762 8.1 HIGH arp: use RCU protection in arp_xmit()
CVE-2025-21766 8.1 HIGH ipv4: use RCU protection in __ip_rt_update_pmtu()
CVE-2025-21765 8.1 HIGH ipv6: use RCU protection in ip6_default_advmss()
CVE-2025-21738 7.8 HIGH ata: libata-sff: Ensure that we cannot write outside the allocated buffer
CVE-2025-21729 7.8 HIGH wifi: rtw89: fix race between cancel_hw_scan and hw_scan completion
CVE-2025-21730 7.8 HIGH wifi: rtw89: avoid to init mgnt_entry list twice when WoWLAN failed
CVE-2025-21801 7.8 HIGH net: ravb: Fix missing rtnl lock in suspend/resume path
CVE-2024-54458 7.8 HIGH scsi: ufs: bsg: Set bsg_queue to NULL after removal

Showing top 20 of 177 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21759

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