CVE-2022-49077
mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0)
Summary
Descriptions
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.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2025-02-26 CVE Reserved
- 2025-02-26 CVE Published
- 2025-02-26 CVE Updated
- ---------- EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
Threat Intelligence Resources (0)
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References (9)
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Affected Vendors, Products, and Versions
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| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 4.9.311 Search vendor "Linux" for product "Linux Kernel" and version " < 4.9.311" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 4.14.276 Search vendor "Linux" for product "Linux Kernel" and version " < 4.14.276" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 4.19.238 Search vendor "Linux" for product "Linux Kernel" and version " < 4.19.238" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 5.4.189 Search vendor "Linux" for product "Linux Kernel" and version " < 5.4.189" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 5.10.111 Search vendor "Linux" for product "Linux Kernel" and version " < 5.10.111" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 5.15.34 Search vendor "Linux" for product "Linux Kernel" and version " < 5.15.34" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 5.16.20 Search vendor "Linux" for product "Linux Kernel" and version " < 5.16.20" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 5.17.3 Search vendor "Linux" for product "Linux Kernel" and version " < 5.17.3" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 5.18 Search vendor "Linux" for product "Linux Kernel" and version " < 5.18" | en |
Affected
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