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CVE-2025-21768— net: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels

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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于rpl、seg6和ioam6 lwtunnels未正确处理dst缓存引用，可能导致内存泄漏。

AI Predicted 5.9 Difficulty: Moderate EPSS 0.21% · P10

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 6c8702c60b88651072460f3f4026c7dfe2521d12< e2ef3fa31353b30bda94358fe5205c141289746d affected
6c8702c60b88651072460f3f4026c7dfe2521d12< 5ab11a4e219e93b8b31a27f8ec98d42afadd8b7a affected
6c8702c60b88651072460f3f4026c7dfe2521d12< 4c0f200c7d06fedddde82209c099014d63f4a6c0 affected
6c8702c60b88651072460f3f4026c7dfe2521d12< 92191dd1073088753821b862b791dcc83e558e07 affected
4.10 affected
< 4.10 unaffected
6.6.160≤ 6.6.* unaffected
6.12.16≤ 6.12.* unaffected
… +2 more rows
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I. Basic Information for CVE-2025-21768

Vulnerability Information
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Vulnerability Title
net: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels Some lwtunnels have a dst cache for post-transformation dst. If the packet destination did not change we may end up recording a reference to the lwtunnel in its own cache, and the lwtunnel state will never be freed. Discovered by the ioam6.sh test, kmemleak was recently fixed to catch per-cpu memory leaks. I'm not sure if rpl and seg6 can actually hit this, but in principle I don't see why not.
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于rpl、seg6和ioam6 lwtunnels未正确处理dst缓存引用，可能导致内存泄漏。
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 6c8702c60b88651072460f3f4026c7dfe2521d12 ~ e2ef3fa31353b30bda94358fe5205c141289746d -
Linux Linux 4.10 -

II. Public POCs for CVE-2025-21768

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III. Intelligence Information for CVE-2025-21768

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Patches & Fixes for CVE-2025-21768 (4)

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

CVE-2025-21805 9.8 CRITICAL RDMA/rtrs: Add missing deinit() call
CVE-2025-21796 9.8 CRITICAL nfsd: clear acl_access/acl_default after releasing them
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-2024-58006 9.6 CRITICAL PCI: dwc: ep: Prevent changing BAR size/flags in pci_epc_set_bar()
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-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-2025-21710 8.2 HIGH tcp: correct handling of extreme memory squeeze
CVE-2025-21766 8.1 HIGH ipv4: use RCU protection in __ip_rt_update_pmtu()
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-2025-21765 8.1 HIGH ipv6: use RCU protection in ip6_default_advmss()
CVE-2025-21760 8.1 HIGH ndisc: extend RCU protection in ndisc_send_skb()
CVE-2024-58013 7.8 HIGH Bluetooth: MGMT: Fix slab-use-after-free Read in mgmt_remove_adv_monitor_sync
CVE-2025-21763 7.8 HIGH neighbour: use RCU protection in __neigh_notify()
CVE-2024-58010 7.8 HIGH binfmt_flat: Fix integer overflow bug on 32 bit systems
CVE-2025-21764 7.8 HIGH ndisc: use RCU protection in ndisc_alloc_skb()
CVE-2025-21792 7.8 HIGH ax25: Fix refcount leak caused by setting SO_BINDTODEVICE sockopt

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-2025-21768

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