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CVE-2026-80845— xfrm: avoid lock inversion in nat keepalive work

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 6.11版本存在安全漏洞，该漏洞源于nat_keepalive_work()遍历状态表时持有xfrm_state_lock，其回调获取x->lock，与删除路径以相反顺序获取相同锁，形成AB-BA死锁，可能导致NAT keepalive worker与SA删除竞争时发生死锁。

AI Predicted 4.0 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1494

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae< ea09210462316e5235a25eccb11ad0708d86615e affected
f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae< 5c86c895d1cac81a71ead3005084c6265cf6a7a5 affected
f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae< 89ef3a2e1e4682ab82b0455ce113f8c39fb9e50d affected
f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae< a9fa05b7a1246797748d15771052639e0d3cabf1 affected
f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae< 763fe700b7c58ad64fe5202c5638848244dd4127 affected
6.11 affected
< 6.11 unaffected
6.12.108≤ 6.12.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-80845

Vulnerability Information
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Vulnerability Title
xfrm: avoid lock inversion in nat keepalive work
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: avoid lock inversion in nat keepalive work nat_keepalive_work() walks the state table while xfrm_state_walk() holds net->xfrm.xfrm_state_lock. Its callback then acquires x->lock, which conflicts with the delete path taking the same locks in reverse order via xfrm_state_delete() and __xfrm_state_delete(). This creates an AB-BA deadlock that is reported by lockdep when a NAT keepalive worker races with SA deletion. Fix this by splitting the keepalive walk into two phases. First, collect the candidate states while the walk holds xfrm_state_lock and take a reference on each state. Then, after the walk completes, process each collected state and acquire x->lock without nesting it under xfrm_state_lock.
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 6.11版本存在安全漏洞，该漏洞源于nat_keepalive_work()遍历状态表时持有xfrm_state_lock，其回调获取x->lock，与删除路径以相反顺序获取相同锁，形成AB-BA死锁，可能导致NAT keepalive worker与SA删除竞争时发生死锁。
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 f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae ~ ea09210462316e5235a25eccb11ad0708d86615e -
Linux Linux 6.11 -

II. Public POCs for CVE-2026-80845

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III. Intelligence Information for CVE-2026-80845

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Patches & Fixes for CVE-2026-80845 (5)

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

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