A local user with the "userused" delegated ZFS permission can trigger a kernel heap overflow via the ZFS_IOC_USERSPACE_MANY ioctl, potentially escalating privileges.
No advisories yet.
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
Thu, 20 Aug 2026 05:30:00 +0000
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ssvc
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Wed, 19 Aug 2026 13:30:00 +0000
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cvssV3_1
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Wed, 19 Aug 2026 12:45:00 +0000
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Freebsd
Freebsd freebsd |
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| Vendors & Products |
Freebsd
Freebsd freebsd |
Wed, 19 Aug 2026 05:30:00 +0000
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| Description | The ZFS_IOC_USERSPACE_MANY ioctl, used by zfs-userspace(8), truncated a 64-bit output buffer size to a 32-bit integer for the kernel allocation, but used the original 64-bit size as the buffer limit when writing records. A local user with the "userused" delegated ZFS permission can trigger a kernel heap overflow via the ZFS_IOC_USERSPACE_MANY ioctl, potentially escalating privileges. | |
| Title | Kernel heap overflow in ZFS_IOC_USERSPACE_MANY ioctl | |
| Weaknesses | CWE-122 | |
| References |
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Projects
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Status: PUBLISHED
Assigner: freebsd
Published:
Updated: 2026-08-20T03:55:49.215Z
Reserved: 2026-05-29T20:24:28.616Z
Link: CVE-2026-49429
Updated: 2026-08-19T12:16:32.478Z
Status : Received
Published: 2026-08-19T06:17:42.513
Modified: 2026-08-20T04:16:51.300
Link: CVE-2026-49429
No data.
OpenCVE Enrichment
Updated: 2026-08-20T04:30:06Z