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CVE-2026-80846— xfrm: drop ESP-in-TCP packets with no ingress device

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 5.6版本存在安全漏洞，该漏洞源于ESP-in-TCP数据在进入XFRM输入路径时，原始入口设备已移除导致dev_get_by_index_rcu返回NULL，进而解引用空设备，可能导致系统崩溃。

AI Predicted 5.6 Difficulty: Hard EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 239d0f71af09dc2029fd4d730cb24b8c83aaa43a affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< f00235f9d12301183d61f75fbe4105506f3e5140 affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 6af5cdb03819a5ce6e945992635c6c5e91045367 affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 2dd1609cadff46c4b20ce53b91ab9cce1380456a affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< c296d25efbc840be24de83f56d43bc47e714ace9 affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 328e40aa774b446969c69b654c52a051a95af8a1 affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 7911e0236616487b89db6bd3ba3f408abd10eb23 affected
e27cca96cd68fa2c6814c90f9a1cfd36bb68c593< 943d95233b8b4a88994e244fcf466f8c403d63f1 affected
… +12 more rows
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I. Basic Information for CVE-2026-80846

Vulnerability Information
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Vulnerability Title
xfrm: drop ESP-in-TCP packets with no ingress device
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: drop ESP-in-TCP packets with no ingress device ESP-in-TCP receives records through the TCP strparser. handle_esp() restores skb->dev from the saved skb_iif before passing the packet into the XFRM input path. Queued TCP data can be processed after the original ingress device has been removed, for example during veth or net namespace teardown. In that case dev_get_by_index_rcu() returns NULL. The XFRM IPv4 and IPv6 input paths both expect skb->dev to be valid while building the route lookup, so queued ESP-in-TCP data can dereference a NULL device. Drop the packet if the saved ingress device can no longer be resolved. Such a packet can no longer be routed through the normal XFRM receive path, and this preserves the existing behaviour for packets whose ingress device still exists.
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 5.6版本存在安全漏洞，该漏洞源于ESP-in-TCP数据在进入XFRM输入路径时，原始入口设备已移除导致dev_get_by_index_rcu返回NULL，进而解引用空设备，可能导致系统崩溃。
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 e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 ~ 239d0f71af09dc2029fd4d730cb24b8c83aaa43a -
Linux Linux 5.6 -

II. Public POCs for CVE-2026-80846

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III. Intelligence Information for CVE-2026-80846

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Patches & Fixes for CVE-2026-80846 (9)

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-2026-80846

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