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CVE-2026-80792— ipv6: fix use-after-free in ip6_finish_output2()

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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于ip6_finish_output2()函数在调用lwtunnel_xmit()后继续使用已被释放的IPv6目的地址指针，造成释放后重用读取，可能导致敏感内核数据泄露、邻居表被污染、流量误导或系统崩溃。

AI Predicted 5.5 Difficulty: Hard EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1570 · Lateral Tool Transfer

Affected Version Matrix 23

VendorProduct Version RangeStatus
Linux Linux 4132c4ad00ddbf3a175ea0d2c775b662a32f4c85< 75e0a544ebe9af663ef53ca21e9e9185c51fb54a affected
e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2< c95f01b78266828a57060d754fcbfc92123a98ed affected
e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2< d960881b9312e781a3429aabceb223ce6b7c882f affected
e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2< 087ee0d914aaae929f1660c9ca878e367655ba1a affected
e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2< 3c770ac4e6f07af7c7b40c474a3efc61ffed7862 affected
e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2< 3dc98e5fe82d069dd29b124ffbdb679331dfea43 affected
e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2< 99219c82804f266189388e8bf1cf5135d10d5515 affected
e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2< 73a187384a8c8b983c7fea046d716b6752a1e7a3 affected
… +15 more rows
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I. Basic Information for CVE-2026-80792

Vulnerability Information
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Vulnerability Title
ipv6: fix use-after-free in ip6_finish_output2()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: fix use-after-free in ip6_finish_output2() ip6_finish_output2() caches a pointer to the IPv6 destination address (daddr) before invoking lwtunnel_xmit(). The LWT-BPF transmit path or other encapsulation operations within lwtunnel_xmit() can reallocate the skb head, freeing the memory that daddr points to. When lwtunnel_xmit() returns LWTUNNEL_XMIT_CONTINUE, the function continues to use the stale daddr pointer to compute the nexthop and to look up or create the neighbour entry. This results in a use-after-free read, which can leak sensitive kernel data, pollute the neighbour table with arbitrary values, misdirect traffic, or crash the system. Fix this by re-fetching the IPv6 header and the destination address pointer after lwtunnel_xmit() returns LWTUNNEL_XMIT_CONTINUE, ensuring that the subsequent nexthop computation and neighbour lookup operate on valid memory.
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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于ip6_finish_output2()函数在调用lwtunnel_xmit()后继续使用已被释放的IPv6目的地址指针，造成释放后重用读取，可能导致敏感内核数据泄露、邻居表被污染、流量误导或系统崩溃。
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 4132c4ad00ddbf3a175ea0d2c775b662a32f4c85 ~ 75e0a544ebe9af663ef53ca21e9e9185c51fb54a -
Linux Linux 5.15 -

II. Public POCs for CVE-2026-80792

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III. Intelligence Information for CVE-2026-80792

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Patches & Fixes for CVE-2026-80792 (8)

Other References for CVE-2026-80792 (1)

Same Patch Batch · Linux · 2026-09-04 · 156 CVEs total

CVE-2026-80865 bpf: Add missing access_ok call to copy_user_syms
CVE-2026-80856 fuse: fix invalidate lock leak on setattr writeback failure
CVE-2026-80857 fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free
CVE-2026-80858 fuse: publish io-uring queues with release semantics
CVE-2026-80859 fuse: fix missing barrier when checking io-uring readiness
CVE-2026-80860 fuse: fix race between interrupt and resend
CVE-2026-80861 usb: xhci: bail out of setup if the controller is inaccessible
CVE-2026-80862 nvme-tcp: fix usage of page_frag_cache
CVE-2026-80863 RDMA/rxe: Fix OOB in free_rd_atomic_resources()
CVE-2026-80864 RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
CVE-2026-80870 drm/amdkfd: Validate CRIU-restored IDs before idr_alloc
CVE-2026-80874 arm64: dts: renesas: ironhide: Describe inline ECC carveouts
CVE-2026-80873 KVM: arm64: nv: Write ESR_EL2 for injected nested SError exceptions
CVE-2026-80872 ALSA: hda/tas2781: Cancel async firmware request at unbind
CVE-2026-80871 crypto: xilinx-trng - Remove crypto_rng interface
CVE-2026-80868 ntfs3: Allocate iomap inline_data using alloc_page
CVE-2026-80866 tipc: avoid busy looping in tipc_exit_net()
CVE-2026-80867 alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
CVE-2026-80855 fuse: fix invalidate lock leak on open O_TRUNC DAX failure
CVE-2026-80869 ntfs: bound the attribute-list entry in ntfs_read_inode_mount()

Showing top 20 of 156 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80792

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