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CVE-2026-80823— nfc: st21nfca: validate ATR_REQ length against the received frame

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drivers/nfc/st21nfca/dep.c文件中的st21nfca_tm_recv_atr_req函数对ATR_REQ帧长度验证不足，未检查atr_req->length是否超过实际接收长度（skb->len），导致越界读取，可能造成内核内存泄露或拒绝服务。

AI Predicted 5.8 Difficulty: Moderate EPSS 0.24% · P14

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 1892bf844ea0261736bd5e75546fc996e9daeedf< 785df00bb3ae3206674a43284eb06dac575b5c64 affected
1892bf844ea0261736bd5e75546fc996e9daeedf< 2c1ad291f4cdc357f9527b688c6fda9c6ffa7890 affected
1892bf844ea0261736bd5e75546fc996e9daeedf< dd26d30f40c43ad9cfe2f25c6ea0ead1dd51d5aa affected
1892bf844ea0261736bd5e75546fc996e9daeedf< 9635507fe82949e429b3cd938876a9917125b151 affected
1892bf844ea0261736bd5e75546fc996e9daeedf< 0f344944c506b4f02d2b098489f7268b438c369e affected
1892bf844ea0261736bd5e75546fc996e9daeedf< bfcca5f42c9aa4eadef1e5fe7bb23783d7fcc96d affected
1892bf844ea0261736bd5e75546fc996e9daeedf< 304f5b414f4051d324b8c4a3ab0e79f7dc7e150e affected
1892bf844ea0261736bd5e75546fc996e9daeedf< f33cecf69095c43be88567fef92b180b858f7369 affected
… +12 more rows
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I. Basic Information for CVE-2026-80823

Vulnerability Information
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Vulnerability Title
nfc: st21nfca: validate ATR_REQ length against the received frame
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nfc: st21nfca: validate ATR_REQ length against the received frame st21nfca_tm_recv_atr_req() checks that the received ATR_REQ frame is at least ST21NFCA_ATR_REQ_MIN_SIZE and that the self-declared atr_req->length is at least sizeof(struct st21nfca_atr_req), but never checks that atr_req->length does not exceed the actual received length (skb->len). st21nfca_tm_send_atr_res() then trusts the declared length: gb_len = atr_req->length - sizeof(struct st21nfca_atr_req); ... memcpy(atr_res->gbi, atr_req->gbi, gb_len); so an RF peer that sends a short frame but sets atr_req->length larger than the frame makes gb_len exceed the general bytes actually present, and the memcpy reads out of bounds past the received skb. Those bytes are placed in the ATR_RES and sent back to the peer (kernel-memory disclosure to a proximity attacker); a larger declared length is an out-of-bounds read (DoS). Reject frames whose declared length exceeds the received length. The adjacent nfc_tm_activated() path in the same function already derives its general-bytes length from skb->len rather than the declared field. Found by 0sec (https://0sec.ai) using automated source analysis; the missing bound is evident from source. Compile-tested.
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drivers/nfc/st21nfca/dep.c文件中的st21nfca_tm_recv_atr_req函数对ATR_REQ帧长度验证不足，未检查atr_req->length是否超过实际接收长度（skb->len），导致越界读取，可能造成内核内存泄露或拒绝服务。
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 1892bf844ea0261736bd5e75546fc996e9daeedf ~ 785df00bb3ae3206674a43284eb06dac575b5c64 -
Linux Linux 3.17 -

II. Public POCs for CVE-2026-80823

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III. Intelligence Information for CVE-2026-80823

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Patches & Fixes for CVE-2026-80823 (8)

Other References for CVE-2026-80823 (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-2026-80823

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