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CVE-2026-64603— platform/x86: intel-hid: Protect ACPI notify handler against recursion

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基金会开源的一款操作系统内核。 Linux kernel 6.8版本存在安全漏洞，该漏洞源于ACPI通知处理程序并发竞争问题，可能导致多个CPU核心同时执行时SW_TABLET_MODE输入设备重复注册，产生重复的sysfs条目并导致空指针取消引用。

AI Predicted 4.4 Difficulty: Trivial EPSS 0.16% · P4

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux e2ffcda1629012a2c1a3706432bc45fdc899a584< a6402808e552e44e9c26a9fe8395ac11703d5800 affected
e2ffcda1629012a2c1a3706432bc45fdc899a584< 86df6499dfd232fbc1c82c0d6eb9322ca67b8cd0 affected
e2ffcda1629012a2c1a3706432bc45fdc899a584< eace3b3e729d5ba11794d69acfafb58a7950217c affected
e2ffcda1629012a2c1a3706432bc45fdc899a584< c085d82613d5618814b84406c8b2d64f1bc305e7 affected
6.8 affected
< 6.8 unaffected
6.12.96≤ 6.12.* unaffected
6.18.39≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-64603

Vulnerability Information
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Vulnerability Title
platform/x86: intel-hid: Protect ACPI notify handler against recursion
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: platform/x86: intel-hid: Protect ACPI notify handler against recursion Since commit e2ffcda16290 ("ACPI: OSL: Allow Notify () handlers to run on all CPUs") ACPI notify handlers like the intel-hid notify_handler() may run on multiple CPU cores racing with themselves. On convertibles and detachables (matched by DMI chassis-type 31 and 32 in dmi_auto_add_switch[]) the SW_TABLET_MODE input device is registered lazily from notify_handler() on the first tablet-mode event, via intel_hid_switches_setup(). When two such events race on different CPUs both can pass the !priv->switches check and register the priv->switches input device twice, resulting in a duplicate sysfs entry and a subsequent NULL pointer dereference. This is the same class of bug fixed by commit e075c3b13a0a ("platform/x86: intel-vbtn: Protect ACPI notify handler against recursion") for the sibling intel-vbtn driver. Protect intel-hid notify_handler() from racing with itself with a mutex to fix this.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 6.8版本存在安全漏洞，该漏洞源于ACPI通知处理程序并发竞争问题，可能导致多个CPU核心同时执行时SW_TABLET_MODE输入设备重复注册，产生重复的sysfs条目并导致空指针取消引用。
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 e2ffcda1629012a2c1a3706432bc45fdc899a584 ~ a6402808e552e44e9c26a9fe8395ac11703d5800 -
Linux Linux 6.8 -

II. Public POCs for CVE-2026-64603

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III. Intelligence Information for CVE-2026-64603

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Patches & Fixes for CVE-2026-64603 (3)

Same Patch Batch · Linux · 2026-08-06 · 22 CVEs total

CVE-2026-64597 9.8 CRITICAL smb: client: fix double-free in SMB2_close() replay
CVE-2026-64598 8.8 HIGH smb/client: Fix error code in smb2_aead_req_alloc()
CVE-2026-64586 8.8 HIGH wifi: brcmfmac: drain bus_reset work on device removal
CVE-2026-64583 7.8 HIGH usb: gadget: udc: bdc: free IRQ and drain func_wake_notify before teardown
CVE-2026-64584 7.8 HIGH usb: gadget: f_midi: cancel pending IN work before freeing the midi object
CVE-2026-64601 7.8 HIGH ALSA: us144mkii: capture_urb_complete: redundant usb_anchor_urb corrupts anchor list on ea
CVE-2026-64599 7.8 HIGH crypto: amlogic - avoid double cleanup in meson_crypto_probe()
CVE-2026-64585 7.8 HIGH can: esd_usb: kill anchored URBs before freeing netdevs
CVE-2026-64588 7.8 HIGH fuse-uring: fix data races on ring->ready
CVE-2026-64587 7.0 HIGH net: ethernet: arc: emac: quiesce interrupts before requesting IRQ
CVE-2026-64593 btrfs: do not trim a device which is not writeable
CVE-2026-64589 i2c: core: fix NULL-deref on adapter registration failure
CVE-2026-64591 iommu/vt-d: Avoid WARNING in sva unbind path
CVE-2026-64590 dma-buf/udmabuf: skip redundant cpu sync to fix cacheline EEXIST warning
CVE-2026-64592 riscv: mm: Unconditionally sfence.vma for spurious fault
CVE-2026-68480 x86/bugs: Make Safe-RET robust against interrupt injection
CVE-2026-64594 usb: gadget: f_fs: initialize reset_work at allocation time
CVE-2026-64595 HID: hid-lenovo-go: cancel cfg_setup work in hid_go_cfg_remove()
CVE-2026-64596 libfs: set SB_I_NOEXEC and SB_I_NODEV by default in init_pseudo()
CVE-2026-64602 iio: adc: spear: Initialize completion before requesting IRQ

Showing top 20 of 22 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64603

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