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

EPSS 0.05% · P17

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinux6c8702c60b88651072460f3f4026c7dfe2521d12< 5ab11a4e219e93b8b31a27f8ec98d42afadd8b7aaffected
6c8702c60b88651072460f3f4026c7dfe2521d12< 4c0f200c7d06fedddde82209c099014d63f4a6c0affected
6c8702c60b88651072460f3f4026c7dfe2521d12< 92191dd1073088753821b862b791dcc83e558e07affected
4.10affected
< 4.10unaffected
6.12.16≤ 6.12.*unaffected
6.13.4≤ 6.13.*unaffected
6.14≤ *unaffected
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 6c8702c60b88651072460f3f4026c7dfe2521d12 ~ 5ab11a4e219e93b8b31a27f8ec98d42afadd8b7a -
LinuxLinux 4.10 -

II. Public POCs for CVE-2025-21768

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III. Intelligence Information for CVE-2025-21768

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

CVE-2025-217567.8 HIGHvsock: Keep the binding until socket destruction
CVE-2025-21773can: etas_es58x: fix potential NULL pointer dereference on udev->serial
CVE-2025-21761openvswitch: use RCU protection in ovs_vport_cmd_fill_info()
CVE-2025-21763neighbour: use RCU protection in __neigh_notify()
CVE-2025-21762arp: use RCU protection in arp_xmit()
CVE-2025-21764ndisc: use RCU protection in ndisc_alloc_skb()
CVE-2025-21765ipv6: use RCU protection in ip6_default_advmss()
CVE-2025-21766ipv4: use RCU protection in __ip_rt_update_pmtu()
CVE-2025-21767clocksource: Use migrate_disable() to avoid calling get_random_u32() in atomic context
CVE-2025-21769ptp: vmclock: Add .owner to vmclock_miscdev_fops
CVE-2025-21771sched_ext: Fix incorrect autogroup migration detection
CVE-2025-21770iommu: Fix potential memory leak in iopf_queue_remove_device()
CVE-2025-21777ring-buffer: Validate the persistent meta data subbuf array
CVE-2025-21783gpiolib: Fix crash on error in gpiochip_get_ngpios()
CVE-2025-21781batman-adv: fix panic during interface removal
CVE-2025-21780drm/amdgpu: avoid buffer overflow attach in smu_sys_set_pp_table()
CVE-2025-21779KVM: x86: Reject Hyper-V's SEND_IPI hypercalls if local APIC isn't in-kernel
CVE-2025-21778tracing: Do not allow mmap() of persistent ring buffer
CVE-2025-21774can: rockchip: rkcanfd_handle_rx_fifo_overflow_int(): bail out if skb cannot be allocated
CVE-2025-21772partitions: mac: fix handling of bogus partition table

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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