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CVE-2022-49991 (GCVE-0-2022-49991)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:00 – Updated: 2026-08-05 08:57
VLAI
Title
mm/hugetlb: avoid corrupting page->mapping in hugetlb_mcopy_atomic_pte
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f619147104c8ea71e120e4936d2b68ec11a1e527 , < da60ddd80d09f8371fbba1a238a4b318d13ba698 (git)
Affected: f619147104c8ea71e120e4936d2b68ec11a1e527 , < 3ada1b3e58db255a14ec73a59d7913e84dc5a8a4 (git)
Affected: f619147104c8ea71e120e4936d2b68ec11a1e527 , < ab74ef708dc51df7cf2b8a890b9c6990fac5c0c6 (git)
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Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.65 , ≤ 5.15.* (semver)
Unaffected: 5.19.6 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/hugetlb.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/hugetlb: avoid corrupting page-\u003emapping in hugetlb_mcopy_atomic_pte\n\nIn MCOPY_ATOMIC_CONTINUE case with a non-shared VMA, pages in the page\ncache are installed in the ptes.  But hugepage_add_new_anon_rmap is called\nfor them mistakenly because they\u0027re not vm_shared.  This will corrupt the\npage-\u003emapping used by page cache code."
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              "value": "AV:L - Exploitation requires local syscalls: memfd_create(MFD_HUGETLB)/mmap, userfaultfd, and UFFDIO_CONTINUE. The vulnerable path is not reachable from the network stack or remote protocols.\nAC:L - The attacker fully controls the trigger sequence (populate the hugetlb page cache, MAP_PRIVATE + UFFD MINOR register, then UFFDIO_CONTINUE) with no race or other conditions outside their control.\nPR:L - An unprivileged user can create hugetlb memfds via memfd_create(MFD_HUGETLB) (HUGETLB_ANONHUGE_INODE needs no CAP_IPC_LOCK) and open userfaultfd with UFFD_USER_MODE_ONLY without privileges.\nUI:N - The attacker performs all setup and triggers UFFDIO_CONTINUE themselves; no action by another user is required.\nS:U - Impact is confined to the local kernel\u0027s memory-management authority (corruption/DoS/potential privilege escalation within the same host); it does not cross a VM or other security boundary.\nC:H - Corrupting page-\u003emapping on a page-cache hugepage into an attacker-owned anon_vma is type confusion; the page can retain a dangling anon_vma pointer after the private VMA is torn down, enabling use-after-free reads of kernel memory.\nI:H - The same mapping/type confusion and mapcount reset via hugepage_add_new_anon_rmap on an existing page-cache page yield a write primitive suitable for control-flow hijacking or privilege escalation.\nA:H - The invariant break reliably causes kernel oops/BUG_ON/panic paths in page-cache, rmap, and hugetlb teardown when the corrupted page is later used."
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    "cveId": "CVE-2022-49991",
    "datePublished": "2025-06-18T11:00:51.745Z",
    "dateReserved": "2025-06-18T10:57:27.386Z",
    "dateUpdated": "2026-08-05T08:57:03.320Z",
    "state": "PUBLISHED"
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En el caso de MCOPY_ATOMIC_CONTINUE con un VMA no compartido, las p\u00e1ginas de la cach\u00e9 de p\u00e1ginas se instalan en los ptes. Sin embargo, se llama a hugepage_add_new_anon_rmap por error porque no son vm_shared. 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T03:41:04+00:00",
      "cve": "CVE-2022-49991",
      "id": "CVE-2022-49991",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "365",
      "product_status:known_affected": "36",
      "product_status:known_not_affected": "152",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm/hugetlb: avoid corrupting page-\u003emapping in hugetlb_mcopy_atomic_pte",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49991.json",
      "version": "3"
    },
    "suse_vex": {
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      "current_release_date": "2026-09-05T00:55:20Z",
      "cve": "CVE-2022-49991",
      "id": "CVE-2022-49991",
      "initial_release_date": "2025-06-19T03:44:38Z",
      "product_status:known_affected": "61",
      "product_status:known_not_affected": "448",
      "product_status:recommended": "27",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49991",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49991.json",
      "version": "12"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.