CVE-2022-49991
CVE-2022-49991 is a medium-severity vulnerability in Linux Linux Kernel with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: Medium (CVSS 3.x base score 5.5)
- EPSS exploit prediction: 0% (11th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2022-55270
- Affected product: Linux Linux Kernel
- Published:
- Last modified:
Description
In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: avoid corrupting page->mapping in hugetlb_mcopy_atomic_pte In MCOPY_ATOMIC_CONTINUE case with a non-shared VMA, pages in the page cache are installed in the ptes. But hugepage_add_new_anon_rmap is called for them mistakenly because they're not vm_shared. This will corrupt the page->mapping used by page cache code.
Frequently asked questions
- What is CVE-2022-49991?
- In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: avoid corrupting page->mapping in hugetlb_mcopy_atomic_pte In MCOPY_ATOMIC_CONTINUE case with a non-shared VMA, pages in the page cache are installed in the ptes. But hugepage_add_new_anon_rmap is called for them mistakenly because they're not vm_shared. This will corrupt the page->mapping used by page cache code.
- How severe is CVE-2022-49991?
- CVE-2022-49991 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2022-49991 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2022-49991?
- CVE-2022-49991 primarily affects Linux Linux Kernel. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2022-49991?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2022-49991 have an EU (EUVD) identifier?
- Yes. CVE-2022-49991 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2022-55270.
- When was CVE-2022-49991 published?
- CVE-2022-49991 was published on 2025-06-18 and last updated on 2026-06-17.
References
- https://git.kernel.org/stable/c/3ada1b3e58db255a14ec73a59d7913e84dc5a8a4
- https://git.kernel.org/stable/c/ab74ef708dc51df7cf2b8a890b9c6990fac5c0c6
- https://git.kernel.org/stable/c/da60ddd80d09f8371fbba1a238a4b318d13ba698
Affected products (3)
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:*
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