CVE-2022-49077
Linux Kernel KVM mremap Vulnerability
Description
In the Linux kernel, the following vulnerability has been resolved: mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0) If an mremap() syscall with old_size=0 ends up in move_page_tables(), it will call invalidate_range_start()/invalidate_range_end() unnecessarily, i.e. with an empty range. This causes a WARN in KVM's mmu_notifier. In the past, empty ranges have been diagnosed to be off-by-one bugs, hence the WARNing. Given the low (so far) number of unique reports, the benefits of detecting more buggy callers seem to outweigh the cost of having to fix cases such as this one, where userspace is doing something silly. In this particular case, an early return from move_page_tables() is enough to fix the issue.
INFO
Published Date :
Feb. 26, 2025, 7 a.m.
Last Modified :
Feb. 26, 2025, 7 a.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
Exploitability Score :
References to Advisories, Solutions, and Tools
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CVE-2022-49077.
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The following table lists the changes that have been made to the
CVE-2022-49077 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Feb. 26, 2025
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0) If an mremap() syscall with old_size=0 ends up in move_page_tables(), it will call invalidate_range_start()/invalidate_range_end() unnecessarily, i.e. with an empty range. This causes a WARN in KVM's mmu_notifier. In the past, empty ranges have been diagnosed to be off-by-one bugs, hence the WARNing. Given the low (so far) number of unique reports, the benefits of detecting more buggy callers seem to outweigh the cost of having to fix cases such as this one, where userspace is doing something silly. In this particular case, an early return from move_page_tables() is enough to fix the issue. Added Reference https://git.kernel.org/stable/c/01e67e04c28170c47700c2c226d732bbfedb1ad0 Added Reference https://git.kernel.org/stable/c/04bc13dae4a27b8d030843c85ae452bb2f1d9c1f Added Reference https://git.kernel.org/stable/c/2358aa84ef6dafcf544a557caaa6b91afb4a0bd2 Added Reference https://git.kernel.org/stable/c/7d659cb1763ff17d1c6ee082fa6feb4267c7a30b Added Reference https://git.kernel.org/stable/c/a04cb99c5d4668fe3f5c0e5b6da1cecd34c3f219 Added Reference https://git.kernel.org/stable/c/a05540f3903bd8295e8c4cd90dd3d416239a115b Added Reference https://git.kernel.org/stable/c/c19d8de4e682ec4b0ea2b04a832cd8cc0be3bb31 Added Reference https://git.kernel.org/stable/c/e2c328c2a8f9de8b761bd4025b66c63120c55761 Added Reference https://git.kernel.org/stable/c/eeaf28e2a0128147d687237e59d5407ee1b14693
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2022-49077 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2022-49077
weaknesses.