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.
Metrics
No CVSS score has been published yet.
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= e2ffcda1629012a2c1a3706432bc45fdc899a584, < a6402808e552e44e9c26a9fe8395ac11703d5800; >= e2ffcda1629012a2c1a3706432bc45fdc899a584, < 86df6499dfd232fbc1c82c0d6eb9322ca67b8cd0; >= e2ffcda1629012a2c1a3706432bc45fdc899a584, < eace3b3e729d5ba11794d69acfafb58a7950217c; >= e2ffcda1629012a2c1a3706432bc45fdc899a584, < c085d82613d5618814b84406c8b2d64f1bc305e7 |
| Linux | Linux | 6.8 |
References
Timeline
- Published
- Aug 6, 2026
- Last modified
- Aug 17, 2026
- NVD status
- Received