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CVE-2026-90226— nfc: llcp: avoid userspace overflow on invalid optlen

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，已修复以下漏洞： nfc: llcp: 避免无效 optlen 导致的用户空间缓冲区溢出 函数将 强制转换为 并用于 调用，因此无论调用方提供的 是多少，内核始终会写入 4 字节。现有的 仅用于限制返回给用户空间的长度，并未约束实际的写入操作。因此，当 时，写入会超出用户缓冲区边界，从而违反 系统调用合约，影响所有五个支持的选项名称（optnames）。 修复方案是在函数入口处直接拒绝任何 的调用。由于 是 类型，直接进行大小比较时，负的 会被提升为 （无符号整型），从而绕过检查。因此，在大

AI Predicted 5.5 Difficulty: Moderate EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7< 42859562b7cc4313a84a584f338118edb7087066 affected
26fd76cab2e61cedc5c25f7151fb31b57ddc53c7< 598dcd53c52f8eeb9dd5382198c03960d5d40fcd affected
26fd76cab2e61cedc5c25f7151fb31b57ddc53c7< 7e40f2f5e7bc06c3ddef781180ce4f7994176547 affected
26fd76cab2e61cedc5c25f7151fb31b57ddc53c7< 35573c6cb081af2f4a7caeea291302aca5484526 affected
26fd76cab2e61cedc5c25f7151fb31b57ddc53c7< b4c5abaea06292e1dddb70eac1b51589b32c77a3 affected
26fd76cab2e61cedc5c25f7151fb31b57ddc53c7< 8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67 affected
26fd76cab2e61cedc5c25f7151fb31b57ddc53c7< bd6f1277b62bc1df348ca21739df2bc546fcd493 affected
26fd76cab2e61cedc5c25f7151fb31b57ddc53c7< 99985bfa8336fadcc69190ba2dcbd5386af3d661 affected
… +10 more rows
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I. Basic Information for CVE-2026-90226

Vulnerability Information
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Vulnerability Title
nfc: llcp: avoid userspace overflow on invalid optlen
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: avoid userspace overflow on invalid optlen nfc_llcp_getsockopt() casts optval to (u32 __user *) for put_user(), so the kernel always stores 4 bytes regardless of the caller-supplied optlen. The existing min_t(u32, len, sizeof(u32)) only clamps the length reported back to userspace; it does not constrain the store. A call with optlen < 4 therefore writes past the user buffer, violating the getsockopt(2) contract for all five supported optnames. Reject any call with optlen < sizeof(u32) up front. 'len' is int, so a plain size comparison would promote a negative optlen to size_t and slip past the check; an explicit 'len < 0' test is added first to catch negative values before the size compare.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 ~ 42859562b7cc4313a84a584f338118edb7087066 -
Linux Linux 3.10 -

II. Public POCs for CVE-2026-90226

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III. Intelligence Information for CVE-2026-90226

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Patches & Fixes for CVE-2026-90226 (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-2026-90226

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