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CVE-2026-90223— nfc: llcp: bound SNL TLV parsing to the skb and add length checks

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.

在 Linux 内核中，以下漏洞已被修复： nfc: llcp: 将 SNL TLV 解析限定在 skb 范围内并添加长度检查 函数在遍历 SNL TLV 列表时，使用由 推导出的 u16 偏移量/长度对进行遍历，但未将读取操作限定在实际的 skb 数据范围内。由此引发三个问题： 对于短帧（ ）， 发生下溢（underflow）。 读取每个 TLV 的头部（类型、长度）时，未检查是否还有至少两个字节剩余。 声明的 TLV 长度可能超出缓冲区末尾；当 SDREQ 的 时，执行 （size_t 类型）导致下溢，进而在后

CVSS 7.1 · High EPSS 0.47% · P39

Possible ATT&CK Techniques 1 AI

T1079

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 19cfe5843e86cc95542d9d875c9386e197956d75< 88b36d36e12c9ba76decdb580d9c1907c084e587 affected
19cfe5843e86cc95542d9d875c9386e197956d75< 587fc2a5a35b41883b22b8f808fe5d345208914b affected
19cfe5843e86cc95542d9d875c9386e197956d75< f04ac9bf2379f3e2470c400c235eb12f74891bef affected
19cfe5843e86cc95542d9d875c9386e197956d75< 02030f95820c42431280f4f945ff34247fb840ff affected
19cfe5843e86cc95542d9d875c9386e197956d75< 99fdb5c2522f365efa199d0117b641e35097041e affected
19cfe5843e86cc95542d9d875c9386e197956d75< 749a9048bf51a668ec3ab6c0392ba32325607281 affected
19cfe5843e86cc95542d9d875c9386e197956d75< eeb16fb24cfe67947b832fd9ada5f488afc72579 affected
19cfe5843e86cc95542d9d875c9386e197956d75< f4c7f37f0ab990952539dc68d931d65c3657600a affected
… +10 more rows
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I. Basic Information for CVE-2026-90223

Vulnerability Information
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Vulnerability Title
nfc: llcp: bound SNL TLV parsing to the skb and add length checks
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: bound SNL TLV parsing to the skb and add length checks nfc_llcp_recv_snl() walked the SNL TLV list using a u16 offset/length pair derived from skb->len, without bounding reads to the actual skb data. Three problems followed: - For a short frame (skb->len < LLCP_HEADER_SIZE), tlv_len underflowed. - The per-TLV header (type, length) was read without checking that two bytes remained. - A declared TLV length could run past the end of the buffer, and an SDREQ with length == 0 made "service_name_len = length - 1" underflow (size_t), driving an out-of-bounds read in the following strncmp() / nfc_llcp_sock_from_sn(). The SDRES case likewise read tlv[2]/tlv[3] without a length check. A nearby NFC device can reach this without authentication; LLCP link activation happens automatically after NFC-DEP. Walk the TLV list by pointer, bounded by skb_tail_pointer() over the linear skb data, and validate each TLV declared length before use. Add explicit length checks for SDREQ (>= 1) and SDRES (exactly 2). Found by 0sec automated security-research tooling (https://0sec.ai).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 19cfe5843e86cc95542d9d875c9386e197956d75 ~ 88b36d36e12c9ba76decdb580d9c1907c084e587 -
Linux Linux 3.8 -

II. Public POCs for CVE-2026-90223

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III. Intelligence Information for CVE-2026-90223

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Patches & Fixes for CVE-2026-90223 (8)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-90223

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