CVE-2024-27022 (GCVE-0-2024-27022)

Vulnerability from cvelistv5 – Published: 2024-05-01 05:35 – Updated: 2026-08-05 11:29
VLAI
Title
fork: defer linking file vma until vma is fully initialized
Summary
In the Linux kernel, the following vulnerability has been resolved: fork: defer linking file vma until vma is fully initialized Thorvald reported a WARNING [1]. And the root cause is below race: CPU 1 CPU 2 fork hugetlbfs_fallocate dup_mmap hugetlbfs_punch_hole i_mmap_lock_write(mapping); vma_interval_tree_insert_after -- Child vma is visible through i_mmap tree. i_mmap_unlock_write(mapping); hugetlb_dup_vma_private -- Clear vma_lock outside i_mmap_rwsem! i_mmap_lock_write(mapping); hugetlb_vmdelete_list vma_interval_tree_foreach hugetlb_vma_trylock_write -- Vma_lock is cleared. tmp->vm_ops->open -- Alloc new vma_lock outside i_mmap_rwsem! hugetlb_vma_unlock_write -- Vma_lock is assigned!!! i_mmap_unlock_write(mapping); hugetlb_dup_vma_private() and hugetlb_vm_op_open() are called outside i_mmap_rwsem lock while vma lock can be used in the same time. Fix this by deferring linking file vma until vma is fully initialized. Those vmas should be initialized first before they can be used.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8d9bfb2608145cf3e408428c224099e1585471af , < 2e5cbab8ccbfc7d4a3d8a21d3c2a1f2c1aa29b5b (git)
Affected: 8d9bfb2608145cf3e408428c224099e1585471af , < abdb88dd272bbeb93efe01d8e0b7b17e24af3a34 (git)
Affected: 8d9bfb2608145cf3e408428c224099e1585471af , < 35e351780fa9d8240dd6f7e4f245f9ea37e96c19 (git)
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Linux Linux Affected: 6.1
Unaffected: 0 , < 6.1 (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.8.8 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
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And the root cause is below race:\\n\\n CPU 1\\t\\t\\t\\t\\tCPU 2\\n fork\\t\\t\\t\\t\\thugetlbfs_fallocate\\n  dup_mmap\\t\\t\\t\\t hugetlbfs_punch_hole\\n   i_mmap_lock_write(mapping);\\n   vma_interval_tree_insert_after -- Child vma is visible through i_mmap tree.\\n   i_mmap_unlock_write(mapping);\\n   hugetlb_dup_vma_private -- Clear vma_lock outside i_mmap_rwsem!\\n\\t\\t\\t\\t\\t i_mmap_lock_write(mapping);\\n   \\t\\t\\t\\t\\t hugetlb_vmdelete_list\\n\\t\\t\\t\\t\\t  vma_interval_tree_foreach\\n\\t\\t\\t\\t\\t   hugetlb_vma_trylock_write -- Vma_lock is cleared.\\n   tmp-\u003evm_ops-\u003eopen -- Alloc new vma_lock outside i_mmap_rwsem!\\n\\t\\t\\t\\t\\t   hugetlb_vma_unlock_write -- Vma_lock is assigned!!!\\n\\t\\t\\t\\t\\t i_mmap_unlock_write(mapping);\\n\\nhugetlb_dup_vma_private() and hugetlb_vm_op_open() are called outside\\ni_mmap_rwsem lock while vma lock can be used in the same time.  Fix this\\nby deferring linking file vma until vma is fully initialized.  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Y la causa ra\u00edz est\u00e1 por debajo de la raza: CPU 1 CPU 2 fork hugetlbfs_fallocate dup_mmap hugetlbfs_punch_hole i_mmap_lock_write(mapping); vma_interval_tree_insert_after: el vma secundario es visible a trav\u00e9s del \u00e1rbol i_mmap. i_mmap_unlock_write(mapeo); enormetlb_dup_vma_private: \u00a1borre vma_lock fuera de i_mmap_rwsem! i_mmap_lock_write(mapeo); Hugetlb_vmdelete_list vma_interval_tree_foreach Hugetlb_vma_trylock_write: Vma_lock est\u00e1 borrado. tmp-\u0026gt;vm_ops-\u0026gt;open - \u00a1Asigne nuevo vma_lock fuera de i_mmap_rwsem! enormetlb_vma_unlock_write - \u00a1\u00a1\u00a1Vma_lock est\u00e1 asignado!!! i_mmap_unlock_write(mapeo); Hugetlb_dup_vma_private() y hugetlb_vm_op_open() se llaman fuera del bloqueo i_mmap_rwsem, mientras que el bloqueo vma se puede utilizar al mismo tiempo. Solucione este problema posponiendo la vinculaci\u00f3n del archivo vma hasta que vma est\u00e9 completamente inicializado. 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:09:31+00:00",
      "cve": "CVE-2024-27022",
      "id": "CVE-2024-27022",
      "initial_release_date": "2024-05-01T00:00:00+00:00",
      "product_status:fixed": "279",
      "product_status:known_affected": "64",
      "product_status:known_not_affected": "48",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fork: defer linking file vma until vma is fully initialized",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-27022.json",
      "version": "3"
    },
    "vulnrichment": {
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There is no network or remote-peer input path into `dup_mmap()` or `hugetlbfs_punch_hole()`.\\nAC:L - The attacker controls both sides of the race, looping `fork()` in one thread while another loops hole-punch/truncate on the same hugetlbfs fd, and the vulnerable window spans `hugetlb_dup_vma_private()` through `copy_page_range()` to `vm_ops-\u003eopen()`, which is widened to milliseconds simply by using a multi-GB mapping. No condition outside the attacker\u0027s influence is required.\\nPR:L - Any unprivileged local user can reach this: `memfd_create(name, MFD_HUGETLB)` uses `HUGETLB_ANONHUGE_INODE`, which bypasses the `can_do_hugetlb_shm()`/`CAP_IPC_LOCK` check, and `MAP_NORESERVE` lets the mapping succeed even with no huge pages configured. No hugetlbfs mount, capability, or namespace privilege is needed.\\nUI:N - The attacker\u0027s own process performs both the `fork()` and the `fallocate()`/`ftruncate()` that collide; no victim action, mount, or file open by another user is involved.\\nS:U - The corruption is confined to kernel memory-management state (rwsem counters and hugetlb page tables) within the same kernel security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\\nC:H - Running `huge_pmd_unshare()` without the VMA lock reintroduces the shared-PMD page-table use-after-free that lock was added to prevent, letting a freed page-table page remain installed in another mm\u0027s PUD and be reallocated \\u2014 yielding arbitrary physical memory read. Per kernel guidance, memory corruption of this class scores High.\\nI:H - The same PMD page-table UAF gives an arbitrary-write primitive (attacker-controlled PTEs written into freed-and-reallocated memory map arbitrary physical frames), and the unbalanced `up_write()` underflows `sem-\u003ecount`, destroying mutual exclusion on the lock that guards hugetlb page-table teardown.\\nA:H - The mismatched lock/unlock leaves the parent\u0027s `hugetlb_vma_lock-\u003erw_sema` permanently write-held, so every subsequent hugetlb fault, unmap, or `exit_mmap()` on that VMA blocks forever in D state \\u2014 unkillable tasks and hung-task panic \\u2014 in addition to the reported WARNING and UAF-induced oopses.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"8d9bfb2608145cf3e408428c224099e1585471af\", \"lessThan\": \"2e5cbab8ccbfc7d4a3d8a21d3c2a1f2c1aa29b5b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8d9bfb2608145cf3e408428c224099e1585471af\", \"lessThan\": \"abdb88dd272bbeb93efe01d8e0b7b17e24af3a34\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8d9bfb2608145cf3e408428c224099e1585471af\", \"lessThan\": \"35e351780fa9d8240dd6f7e4f245f9ea37e96c19\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/fork.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.1\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.1\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.134\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.8\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/fork.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/2e5cbab8ccbfc7d4a3d8a21d3c2a1f2c1aa29b5b\"}, {\"url\": \"https://git.kernel.org/stable/c/abdb88dd272bbeb93efe01d8e0b7b17e24af3a34\"}, {\"url\": \"https://git.kernel.org/stable/c/35e351780fa9d8240dd6f7e4f245f9ea37e96c19\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfork: defer linking file vma until vma is fully initialized\\n\\nThorvald reported a WARNING [1]. And the root cause is below race:\\n\\n CPU 1\\t\\t\\t\\t\\tCPU 2\\n fork\\t\\t\\t\\t\\thugetlbfs_fallocate\\n  dup_mmap\\t\\t\\t\\t hugetlbfs_punch_hole\\n   i_mmap_lock_write(mapping);\\n   vma_interval_tree_insert_after -- Child vma is visible through i_mmap tree.\\n   i_mmap_unlock_write(mapping);\\n   hugetlb_dup_vma_private -- Clear vma_lock outside i_mmap_rwsem!\\n\\t\\t\\t\\t\\t i_mmap_lock_write(mapping);\\n   \\t\\t\\t\\t\\t hugetlb_vmdelete_list\\n\\t\\t\\t\\t\\t  vma_interval_tree_foreach\\n\\t\\t\\t\\t\\t   hugetlb_vma_trylock_write -- Vma_lock is cleared.\\n   tmp-\u003evm_ops-\u003eopen -- Alloc new vma_lock outside i_mmap_rwsem!\\n\\t\\t\\t\\t\\t   hugetlb_vma_unlock_write -- Vma_lock is assigned!!!\\n\\t\\t\\t\\t\\t i_mmap_unlock_write(mapping);\\n\\nhugetlb_dup_vma_private() and hugetlb_vm_op_open() are called outside\\ni_mmap_rwsem lock while vma lock can be used in the same time.  Fix this\\nby deferring linking file vma until vma is fully initialized.  Those vmas\\nshould be initialized first before they can be used.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.134\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.8\", \"versionStartIncluding\": \"6.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"6.1\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:29:04.523Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-27022\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:29:04.523Z\", \"dateReserved\": \"2024-02-19T14:20:24.210Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-01T05:35:39.627Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.