GHSA-MJ54-2C5F-648C
Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32In the Linux kernel, the following vulnerability has been resolved:
spi: oc-tiny: switch to managed controller allocation
The controller is allocated with the non-managed spi_alloc_host() while the interrupt is registered with devm_request_irq(). During removal, spi_bitbang_stop() only unregisters the controller; the subsequent spi_controller_put() then frees the controller together with its embedded driver-private devdata, which is the IRQ handler's dev_id. The devm_request_irq() release action (free_irq()), which drains the handler, does not run until after .remove() returns. A late or latched interrupt can therefore reach tiny_spi_irq() and dereference already-freed memory (e.g. hw->base).
Switch to devm_spi_alloc_host() so that the devres LIFO order releases the controller only after free_irq() has drained the handler, and drop the now-redundant spi_controller_put() from .remove(). The probe error path is simplified to direct returns.
This issue was found by an in-house static analysis tool.
{
"affected": [],
"aliases": [
"CVE-2026-90433"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-17T17:17:48Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: oc-tiny: switch to managed controller allocation\n\nThe controller is allocated with the non-managed spi_alloc_host() while\nthe interrupt is registered with devm_request_irq(). During removal,\nspi_bitbang_stop() only unregisters the controller; the subsequent\nspi_controller_put() then frees the controller together with its\nembedded driver-private devdata, which is the IRQ handler\u0027s dev_id. The\ndevm_request_irq() release action (free_irq()), which drains the\nhandler, does not run until after .remove() returns. A late or latched\ninterrupt can therefore reach tiny_spi_irq() and dereference\nalready-freed memory (e.g. hw-\u003ebase).\n\nSwitch to devm_spi_alloc_host() so that the devres LIFO order releases\nthe controller only after free_irq() has drained the handler, and drop\nthe now-redundant spi_controller_put() from .remove(). The probe error\npath is simplified to direct returns.\n\nThis issue was found by an in-house static analysis tool.",
"id": "GHSA-mj54-2c5f-648c",
"modified": "2026-09-17T18:32:05Z",
"published": "2026-09-17T18:32:05Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90433"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0260c94453a08491640e61f8cf0c384edbe7bd11"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1cd16c8d68f58e54abb8f331d05469237200631f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d710f43ce30975d197f73c543bfe47b958d8ba17"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ef5cc4a8c088d05549f71950a72b5deff5000fd7"
}
],
"schema_version": "1.4.0",
"severity": []
}
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