platform/x86: intel-hid: Protect ACPI notify handler against recursion

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64603
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-06 08:16:36 UTC
Updated2026-08-06 08:16:36 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e2ffcda1629012a2c1a3706432bc45fdc899a584 a6402808e552e44e9c26a9fe8395ac11703d5800 git Not specified
CNA Linux Linux affected e2ffcda1629012a2c1a3706432bc45fdc899a584 86df6499dfd232fbc1c82c0d6eb9322ca67b8cd0 git Not specified
CNA Linux Linux affected e2ffcda1629012a2c1a3706432bc45fdc899a584 eace3b3e729d5ba11794d69acfafb58a7950217c git Not specified
CNA Linux Linux affected e2ffcda1629012a2c1a3706432bc45fdc899a584 c085d82613d5618814b84406c8b2d64f1bc305e7 git Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c085d82613d5618814b84406c8b2d64f1bc305e7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eace3b3e729d5ba11794d69acfafb58a7950217c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a6402808e552e44e9c26a9fe8395ac11703d5800 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/86df6499dfd232fbc1c82c0d6eb9322ca67b8cd0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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