GHSA-G7FF-3GJ4-4WP3
Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32In the Linux kernel, the following vulnerability has been resolved:
mmc: via-sdmmc: stop card-detect handling on probe failure
request_irq() registers the SD card-detect interrupt and the probe enables it before mmc_add_host() runs. If mmc_add_host() fails, the error path only unmaps the registers and returns: the interrupt stays registered, so the handler keeps running against the host once it is freed. via_sdc_isr() dereferences sdhost and its MMIO base and schedules carddet_work, which via_sdc_card_detect() also runs against freed memory through its container_of() dereference.
Add a probe-error path that disables and frees the interrupt and cancels carddet_work before unmapping. carddet_work can re-enable the device interrupt via via_reset_pcictrl(), which restores PCIINTCTRL, so mask it again after cancelling the work.
This issue was found by an in-house static analysis tool and confirmed by manual code review.
{
"affected": [],
"aliases": [
"CVE-2026-89440"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-11T20:19:24Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: via-sdmmc: stop card-detect handling on probe failure\n\nrequest_irq() registers the SD card-detect interrupt and the probe enables\nit before mmc_add_host() runs. If mmc_add_host() fails, the error path only\nunmaps the registers and returns: the interrupt stays registered, so the\nhandler keeps running against the host once it is freed. via_sdc_isr()\ndereferences sdhost and its MMIO base and schedules carddet_work, which\nvia_sdc_card_detect() also runs against freed memory through its\ncontainer_of() dereference.\n\nAdd a probe-error path that disables and frees the interrupt and cancels\ncarddet_work before unmapping. carddet_work can re-enable the device\ninterrupt via via_reset_pcictrl(), which restores PCIINTCTRL, so mask it\nagain after cancelling the work.\n\nThis issue was found by an in-house static analysis tool and confirmed by\nmanual code review.",
"id": "GHSA-g7ff-3gj4-4wp3",
"modified": "2026-09-14T15:32:23Z",
"published": "2026-09-11T21:31:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89440"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/088eaa92fcebaa6b957ccf9635afdf39643a577d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2550f89589caad7402d618d7dffc038582c94b6b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5bb5327b92aae17e91c7228953c350a6ee3c94e8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/806409f12fdb14c9e4c56a64494c9b75f356cd49"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c2b8a624911999399cc14822fec3e35032b3cee4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d045596706d1b25d38af4a79980b017639fea9d1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dde5b9c91e9fc64e54a2f186d3ae95868b4dbb02"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/efe7f25dd27e35063477b4b0e7eed3675669fd99"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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