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CVE-2026-93050— ipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove

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，以下漏洞已得到修复： ipack: ipoctal：修复设备移除时清理过程中的 UAF、空指针解引用和释放后使用问题 当设备被移除但仍有活动的 tty 会话时，会出现三个问题： 1. struct ipoctal 的释放后使用（UAF）： 移除回调通过 释放 ，但 tty 操作可能仍在访问它。 修复方法：引入基于 的生命周期管理——当 tty 打开时（在 中）获取引用，当 tty 最终销毁时（在 中）释放引用； 中使用 替代 。 2. ipoctal_write_tty() 中的空指针解引用

AI Predicted 7.0 Difficulty: Moderate EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 05e5027efc9c0bb6d1d04cde279afbafca0a7929< ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a affected
05e5027efc9c0bb6d1d04cde279afbafca0a7929< c92ef8fd834521f0b788e0511976c689fe57c63c affected
05e5027efc9c0bb6d1d04cde279afbafca0a7929< a4613140f01bd0fb9980e2746ed9aaa65a29b5d6 affected
05e5027efc9c0bb6d1d04cde279afbafca0a7929< 1a3258e105f711538201bdd2ac2a05b11554eabc affected
05e5027efc9c0bb6d1d04cde279afbafca0a7929< 4a6518be316029650301f2a5e8f0def229b895d9 affected
05e5027efc9c0bb6d1d04cde279afbafca0a7929< b6b5d64cb161a28347d64dc3168a636c4abb68d5 affected
3.8 affected
< 3.8 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-93050

Vulnerability Information
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Vulnerability Title
ipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove Three issues arise when the device is removed while a tty session is still active: 1. UAF of struct ipoctal: the remove callback frees ipoctal via kfree() while tty ops may still access it. Fix by introducing kref-based lifetime management — kref is taken in install() when a tty is opened and released in cleanup() when the tty is finally destroyed; remove() uses kref_put() instead of kfree(). 2. NULL dereference in ipoctal_write_tty(): __ipoctal_remove() frees xmit_buf via tty_port_free_xmit_buf() while a userspace process may still hold the tty fd and call write(). Fix by checking for NULL xmit_buf in ipoctal_write_tty(). 3. UAF in ipoctal_cleanup(): ipack_put_carrier(ipoctal->dev) dereferences ipoctal->dev after the ipack_device has been freed by ipack_device_del(). Fix by caching ipoctal->carrier_owner during probe() and calling module_put() on the cached pointer directly in cleanup(), avoiding any access to ipoctal->dev. Also introduce a "removed" flag in struct ipoctal, set at the start of __ipoctal_remove(), and checked in every tty op that accesses hardware resources (port_activate, write_tty, set_termios, hangup, shutdown). This prevents page faults when devm_ioremap() regions are unmapped after remove() returns.
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 05e5027efc9c0bb6d1d04cde279afbafca0a7929 ~ ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a -
Linux Linux 3.8 -

II. Public POCs for CVE-2026-93050

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III. Intelligence Information for CVE-2026-93050

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Patches & Fixes for CVE-2026-93050 (6)

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-2026-90235 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-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
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-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
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-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
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-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID

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-2026-93050

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