CVE-2026-98994
UnknownSummary
In the Linux kernel, statmount_mnt_basic() read the parent's ids via m->mnt_parent under namespace_sem, which is safe only for mounts in a namespace. For a mount deliberately unmounted and kept alive only by a file descriptor (STATMOUNT_BY_FD), the final mntput() could free the parent concurrently, causing dereference of an already freed mount.
Risk Assessment
The race leads to a use-after-free while reading mount information via statmount, which may cause kernel faults or potentially be exploited for privilege escalation.
Recommendation
Update the Linux kernel to a version containing the fix that reads the parent of an unmounted mount under mount_lock.
Other vulnerabilities in Linux kernel
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- CVE-2026-58847Unknown
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- CVE-2026-58828High
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- CVE-2026-58827High
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- CVE-2026-58826High
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- CVE-2026-58825High
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- CVE-2026-99242Unknown
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- CVE-2026-99241Unknown
In the Linux kernel, a missing lock in ntfs_filemap_page_mkwrite() was fixed; it called iomap_page_mkwrite() without holding mapping->invalidate_lock. A concurrent truncate or fallocate could be invalidating pagecache and rewriting the runlist while the write fault mapped blocks and dirtied the folio.
- CVE-2026-99240Unknown
In the Linux kernel, the DAMON subsystem (mm/damon/core) has a division-by-zero bug when a DAMOS quota goal has a target_value of zero. The fix moves handling of this corner case to the core layer by adding validation in damos_commit_quota_goal(), which now returns an error for zero target values.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: statmount: read the parent of an unmounted mount under mount_lock statmount_mnt_basic() reads the ids of the parent through m->mnt_parent with namespace_sem held for reading. That's fine for a mount that is in a namespace. Everything above it is pinned by that namespace. STATMOUNT_BY_FD also accepts a file descriptor on a mount that has been unmounted on purpose and that only the file descriptor keeps alive. If that mount stayed attached to its parent when it was unmounted the parent is unmounted as well and nothing pins it for the child. The final mntput() unmounts the children under mount_lock alone and frees the parent afterwards. Concurrently, statmount_mnt_basic() reads m->mnt_parent twice while that can happen and can easily dereference a mount that's already gone. Read the parent of an unmounted mount under mount_lock. The parent can't be put while it is held and both ids come from the same mount. A mounted mount's parent is pinned by the namespace and a mount can't leave its namespace while namespace_sem is held, so the common case takes no global lock.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS