cve-2024-46762
Vulnerability from cvelistv5
Published
2024-09-18 07:12
Modified
2024-12-19 09:22
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: xen: privcmd: Fix possible access to a freed kirqfd instance Nothing prevents simultaneous ioctl calls to privcmd_irqfd_assign() and privcmd_irqfd_deassign(). If that happens, it is possible that a kirqfd created and added to the irqfds_list by privcmd_irqfd_assign() may get removed by another thread executing privcmd_irqfd_deassign(), while the former is still using it after dropping the locks. This can lead to a situation where an already freed kirqfd instance may be accessed and cause kernel oops. Use SRCU locking to prevent the same, as is done for the KVM implementation for irqfds.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/112fd2f02b308564724b8e81006c254d20945c4bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/611ff1b1ae989a7bcce3e2a8e132ee30e968c557Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e997b357b13a7d95de31681fc54fcc34235fa527Patch
Impacted products
Vendor Product Version
Linux Linux
Show details on NVD website

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                "id": "CVE-2024-46762",
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                "timestamp": "2024-09-29T14:43:33.478974Z",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxen: privcmd: Fix possible access to a freed kirqfd instance\n\nNothing prevents simultaneous ioctl calls to privcmd_irqfd_assign() and\nprivcmd_irqfd_deassign(). If that happens, it is possible that a kirqfd\ncreated and added to the irqfds_list by privcmd_irqfd_assign() may get\nremoved by another thread executing privcmd_irqfd_deassign(), while the\nformer is still using it after dropping the locks.\n\nThis can lead to a situation where an already freed kirqfd instance may\nbe accessed and cause kernel oops.\n\nUse SRCU locking to prevent the same, as is done for the KVM\nimplementation for irqfds."
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      "title": "xen: privcmd: Fix possible access to a freed kirqfd instance",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-46762",
    "datePublished": "2024-09-18T07:12:21.854Z",
    "dateReserved": "2024-09-11T15:12:18.272Z",
    "dateUpdated": "2024-12-19T09:22:37.978Z",
    "state": "PUBLISHED"
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