The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - In the Linux kernel, the following vulnerability has been resolved: userfaultfd: release page in error     path to avoid BUG_ON Consider the following sequence of events: 1. Userspace issues a UFFD ioctl, which     ends up calling into shmem_mfill_atomic_pte(). We successfully account the blocks, we shmem_alloc_page(),     but then the copy_from_user() fails. We return -ENOENT. We don't release the page we allocated. 2. Our     caller detects this error code, tries the copy_from_user() after dropping the mmap_lock, and retries,     calling back into shmem_mfill_atomic_pte(). 3. Meanwhile, let's say another process filled up the tmpfs     being used. 4. So shmem_mfill_atomic_pte() fails to account blocks this time, and immediately returns -     without releasing the page. This triggers a BUG_ON in our caller, which asserts that the page should     always be consumed, unless -ENOENT is returned. To fix this, detect if we have such a dangling page when     accounting fails, and if so, release it before returning. (CVE-2021-46988)

Note that Nessus relies on the presence of the package as reported by the vendor.

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Linux Distros Unpatched Vulnerability : CVE-2021-46988

medium Nessus Plugin ID 230190

Version 1.4