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CVE-2026-31622— NFC: digital: Bounds check NFC-A cascade depth in SDD response handler

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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于NFC-A级联深度未限制，可能导致堆缓冲区溢出。

CVSS 8.8 · High EPSS 0.45% · P38

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 2c66daecc4092e6049673c281b2e6f0d5e59a94c< 9ba6bb09e00b922d902f684f575779e5433fe6e3 affected
2c66daecc4092e6049673c281b2e6f0d5e59a94c< f83b399aa05a0712e3b1569a30d3d90b3533d2ef affected
2c66daecc4092e6049673c281b2e6f0d5e59a94c< 20663102c14566e900e1d2f679e30b7f1694f387 affected
2c66daecc4092e6049673c281b2e6f0d5e59a94c< 2819f34e08bdffb6f06a51c67948ec5737fb166a affected
2c66daecc4092e6049673c281b2e6f0d5e59a94c< 1bec5698b55aa2be5c3b983dba657c01d0fd3dbc affected
2c66daecc4092e6049673c281b2e6f0d5e59a94c< 5a59bf70c38ee1eb4be03bab830bbc3a6f0bd1f1 affected
2c66daecc4092e6049673c281b2e6f0d5e59a94c< 8d9d9bf3565271ca7ab9c716a94e87296177e7ba affected
2c66daecc4092e6049673c281b2e6f0d5e59a94c< cc024a3de265ef6c58957f4990eccb9f806208cb affected
… +12 more rows
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I. Basic Information for CVE-2026-31622

Vulnerability Information
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Vulnerability Title
NFC: digital: Bounds check NFC-A cascade depth in SDD response handler
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: NFC: digital: Bounds check NFC-A cascade depth in SDD response handler The NFC-A anti-collision cascade in digital_in_recv_sdd_res() appends 3 or 4 bytes to target->nfcid1 on each round, but the number of cascade rounds is controlled entirely by the peer device. The peer sets the cascade tag in the SDD_RES (deciding 3 vs 4 bytes) and the cascade-incomplete bit in the SEL_RES (deciding whether another round follows). ISO 14443-3 limits NFC-A to three cascade levels and target->nfcid1 is sized accordingly (NFC_NFCID1_MAXSIZE = 10), but nothing in the driver actually enforces this. This means a malicious peer can keep the cascade running, writing past the heap-allocated nfc_target with each round. Fix this by rejecting the response when the accumulated UID would exceed the buffer. Commit e329e71013c9 ("NFC: nci: Bounds check struct nfc_target arrays") fixed similar missing checks against the same field on the NCI path.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于NFC-A级联深度未限制，可能导致堆缓冲区溢出。
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 2c66daecc4092e6049673c281b2e6f0d5e59a94c ~ 9ba6bb09e00b922d902f684f575779e5433fe6e3 -
Linux Linux 3.13 -

II. Public POCs for CVE-2026-31622

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III. Intelligence Information for CVE-2026-31622

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Patches & Fixes for CVE-2026-31622 (5)

Same Patch Batch · Linux · 2026-04-24 · 138 CVEs total

CVE-2026-31607 9.8 CRITICAL usbip: validate number_of_packets in usbip_pack_ret_submit()
CVE-2026-31649 9.8 CRITICAL net: stmmac: fix integer underflow in chain mode
CVE-2026-31633 9.8 CRITICAL rxrpc: Fix integer overflow in rxgk_verify_response()
CVE-2026-31608 9.8 CRITICAL smb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list
CVE-2026-31669 9.8 CRITICAL mptcp: fix slab-use-after-free in __inet_lookup_established
CVE-2026-31668 9.8 CRITICAL seg6: separate dst_cache for input and output paths in seg6 lwtunnel
CVE-2026-31589 9.8 CRITICAL mm: call ->free_folio() directly in folio_unmap_invalidate()
CVE-2026-31609 9.8 CRITICAL smb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()
CVE-2026-31536 9.8 CRITICAL smb: server: let send_done handle a completion without IB_SEND_SIGNALED
CVE-2026-31657 9.8 CRITICAL batman-adv: hold claim backbone gateways by reference
CVE-2026-31637 9.8 CRITICAL rxrpc: reject undecryptable rxkad response tickets
CVE-2026-31659 9.8 CRITICAL batman-adv: reject oversized global TT response buffers
CVE-2026-31636 9.1 CRITICAL rxrpc: fix RESPONSE authenticator parser OOB read
CVE-2026-31629 8.8 HIGH nfc: llcp: add missing return after LLCP_CLOSED checks
CVE-2026-31570 8.8 HIGH can: gw: fix OOB heap access in cgw_csum_crc8_rel()
CVE-2026-31558 8.8 HIGH LoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust
CVE-2026-31553 8.8 HIGH KVM: arm64: Fix the descriptor address in __kvm_at_swap_desc()
CVE-2026-31588 8.8 HIGH KVM: x86: Use scratch field in MMIO fragment to hold small write values
CVE-2026-31611 8.6 HIGH ksmbd: require 3 sub-authorities before reading sub_auth[2]
CVE-2026-31631 8.2 HIGH rxrpc: Fix buffer overread in rxgk_do_verify_authenticator()

Showing top 20 of 138 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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