GHSA-CFRR-P6RW-PRF5
Vulnerability from github – Published: 2024-08-21 09:31 – Updated: 2024-09-06 15:32In the Linux kernel, the following vulnerability has been resolved:
dmaengine: idxd: Prevent use after free on completion memory
On driver unload any pending descriptors are flushed at the time the interrupt is freed: idxd_dmaengine_drv_remove() -> drv_disable_wq() -> idxd_wq_free_irq() -> idxd_flush_pending_descs().
If there are any descriptors present that need to be flushed this flow triggers a "not present" page fault as below:
BUG: unable to handle page fault for address: ff391c97c70c9040 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page
The address that triggers the fault is the address of the descriptor that was freed moments earlier via: drv_disable_wq()->idxd_wq_free_resources()
Fix the use after free by freeing the descriptors after any possible usage. This is done after idxd_wq_reset() to ensure that the memory remains accessible during possible completion writes by the device.
{
"affected": [],
"aliases": [
"CVE-2022-48867"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-08-21T07:15:03Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: Prevent use after free on completion memory\n\nOn driver unload any pending descriptors are flushed at the\ntime the interrupt is freed:\nidxd_dmaengine_drv_remove() -\u003e\n\tdrv_disable_wq() -\u003e\n\t\tidxd_wq_free_irq() -\u003e\n\t\t\tidxd_flush_pending_descs().\n\nIf there are any descriptors present that need to be flushed this\nflow triggers a \"not present\" page fault as below:\n\n BUG: unable to handle page fault for address: ff391c97c70c9040\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n\nThe address that triggers the fault is the address of the\ndescriptor that was freed moments earlier via:\ndrv_disable_wq()-\u003eidxd_wq_free_resources()\n\nFix the use after free by freeing the descriptors after any possible\nusage. This is done after idxd_wq_reset() to ensure that the memory\nremains accessible during possible completion writes by the device.",
"id": "GHSA-cfrr-p6rw-prf5",
"modified": "2024-09-06T15:32:56Z",
"published": "2024-08-21T09:31:31Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-48867"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1beeec45f9ac31eba52478379f70a5fa9c2ad005"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b9e8e3fcfec625fc1c2f68f684448aeeb882625b"
}
],
"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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