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CVE-2026-80798— nfc: llcp: reject PDUs shorter than the LLCP header

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NFC LLCP接收路径未检查帧长度至少为LLCP头部大小，短PDU导致减法环绕计算，造成越界读取，附近的NFC设备可无需认证触发该漏洞。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.23% · P15

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux d646960f7986fefb460a2b062d5ccc8ccfeacc3a< e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82 affected
d646960f7986fefb460a2b062d5ccc8ccfeacc3a< f36cffea24bf3e2cc29a00d4b51dbcadc087d810 affected
d646960f7986fefb460a2b062d5ccc8ccfeacc3a< a7b9b449f5a5132221fff6adc11a9431ab8cd914 affected
d646960f7986fefb460a2b062d5ccc8ccfeacc3a< 3793d768b40f38bb97265dd5b9a8b8655c4e1b1d affected
d646960f7986fefb460a2b062d5ccc8ccfeacc3a< eab47618e282602197db287ecbd1b09d356a2515 affected
d646960f7986fefb460a2b062d5ccc8ccfeacc3a< e969e98410051b1ef8cc318bfe0c7e3f24ec766d affected
d646960f7986fefb460a2b062d5ccc8ccfeacc3a< ae5f20f5842f440b72d030e3a34fe182dd8eae42 affected
d646960f7986fefb460a2b062d5ccc8ccfeacc3a< d3d90243393c48146911c67fd3792b549d21d9e6 affected
… +12 more rows
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I. Basic Information for CVE-2026-80798

Vulnerability Information
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Vulnerability Title
nfc: llcp: reject PDUs shorter than the LLCP header
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: reject PDUs shorter than the LLCP header Every LLCP PDU begins with a two-byte header (DSAP/SSAP + PTYPE), but the receive path never checked that a frame is at least LLCP_HEADER_SIZE bytes before parsing it. nfc_llcp_rx_skb() reads the header via nfc_llcp_ptype()/nfc_llcp_dsap()/ nfc_llcp_ssap(), which dereference pdu->data[0] and pdu->data[1], and a CONNECT or CC PDU then computes tlv_array_len = skb->len - LLCP_HEADER_SIZE; as a size_t and hands it to the TLV walk. When the frame is shorter than the header the subtraction wraps to a huge value and the walk runs far past the buffer, an out-of-bounds read. A nearby NFC device can reach this without authentication; LLCP link activation happens automatically after NFC-DEP. Guard the common receive choke point __nfc_llcp_recv(), shared by both the target (nfc_llcp_data_received()) and initiator (nfc_llcp_recv()) paths, so a short skb is dropped before the rx_work worker parses it. Use pskb_may_pull() rather than a skb->len test so the two header bytes are guaranteed to sit in the skb linear area even for a non-linear skb, matching how the sibling NCI and HCI receive paths validate their headers. Reproduced with a KFENCE out-of-bounds read via /dev/virtual_nci on linux-next. Found by 0sec automated security-research tooling (https://0sec.ai).
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NFC LLCP接收路径未检查帧长度至少为LLCP头部大小，短PDU导致减法环绕计算，造成越界读取，附近的NFC设备可无需认证触发该漏洞。
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 d646960f7986fefb460a2b062d5ccc8ccfeacc3a ~ e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82 -
Linux Linux 3.3 -

II. Public POCs for CVE-2026-80798

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III. Intelligence Information for CVE-2026-80798

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Patches & Fixes for CVE-2026-80798 (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

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