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CVE-2026-90066— samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify

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，以下漏洞已修复： samples/ftrace: 修复 ftrace-direct-multi-modify 中针对错误指针的 kthread_stop() 调用 将 的返回值直接赋值给 ，未进行 检查。当 失败时，它会返回 ，但初始化函数仍返回 0，导致模块在 持有错误指针的情况下成功加载。在内核模块卸载时， 会将该错误指针传递给 ，从而导致空指针引用错误。 修复方案： 使用 检查 的返回值；如果失败，则注销 ftrace 直接调用，并传播错误码。

AI Predicted 3.1 Difficulty: Moderate EPSS 0.20% · P9

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux e1067a07cfbc5a36abad3752fafe4c79e06db1bb< 7a96b9f6d5ba23dbce66c8a4a242effd4c01a830 affected
e1067a07cfbc5a36abad3752fafe4c79e06db1bb< 98b7b2a29ae87937aa02ab9391543ef8c602cd94 affected
e1067a07cfbc5a36abad3752fafe4c79e06db1bb< 626614df9080d7052fbe24dc90b5434717ab7a9f affected
e1067a07cfbc5a36abad3752fafe4c79e06db1bb< cf839636911d8313f3ecd098329fd0b96499e4cf affected
e1067a07cfbc5a36abad3752fafe4c79e06db1bb< 6727b7618f49401acf373fa3ec5712e2ec52e5cf affected
5.16 affected
< 5.16 unaffected
6.6.157≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-90066

Vulnerability Information
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Vulnerability Title
samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify ftrace_direct_multi_init() assigns kthread_run()'s return value to simple_tsk without an IS_ERR() check. When kthread_run() fails it returns ERR_PTR(-ENOMEM), but init still returns 0, so the module loads with simple_tsk holding an error pointer. On unload, ftrace_direct_multi_exit() then passes that ERR_PTR to kthread_stop(), leading to a null-pointer-dereference. Check the return value of kthread_run() with IS_ERR(); on failure, unregister the ftrace direct call and propagate the error code.
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 e1067a07cfbc5a36abad3752fafe4c79e06db1bb ~ 7a96b9f6d5ba23dbce66c8a4a242effd4c01a830 -
Linux Linux 5.16 -

II. Public POCs for CVE-2026-90066

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III. Intelligence Information for CVE-2026-90066

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Patches & Fixes for CVE-2026-90066 (5)

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

CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
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-2026-90151 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-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login 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-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
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
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind

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

IV. Related Vulnerabilities

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Same vendor: Linux

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