CVE-2026-31597 (GCVE-0-2026-31597)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-04-24 14:42
VLAI?
Title
ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY filemap_fault() may drop the mmap_lock before returning VM_FAULT_RETRY, as documented in mm/filemap.c: "If our return value has VM_FAULT_RETRY set, it's because the mmap_lock may be dropped before doing I/O or by lock_folio_maybe_drop_mmap()." When this happens, a concurrent munmap() can call remove_vma() and free the vm_area_struct via RCU. The saved 'vma' pointer in ocfs2_fault() then becomes a dangling pointer, and the subsequent trace_ocfs2_fault() call dereferences it -- a use-after-free. Fix this by saving ip_blkno as a plain integer before calling filemap_fault(), and removing vma from the trace event. Since ip_blkno is copied by value before the lock can be dropped, it remains valid regardless of what happens to the vma or inode afterward.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4cf2768a0291a0cdd0dae801ea0eafa3878a349d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d45ff441b416d4aa1af72b1db23d959601c04da2 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 76a602fdbb78dd05b2da06f74a988cebc97e82d0 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 925bf22c1b823e231b1baea761fe8a1512e442f2 (git)
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    Linux Linux Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
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          "programFiles": [
            "fs/ocfs2/mmap.c",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY\n\nfilemap_fault() may drop the mmap_lock before returning VM_FAULT_RETRY,\nas documented in mm/filemap.c:\n\n  \"If our return value has VM_FAULT_RETRY set, it\u0027s because the mmap_lock\n  may be dropped before doing I/O or by lock_folio_maybe_drop_mmap().\"\n\nWhen this happens, a concurrent munmap() can call remove_vma() and free\nthe vm_area_struct via RCU. The saved \u0027vma\u0027 pointer in ocfs2_fault() then\nbecomes a dangling pointer, and the subsequent trace_ocfs2_fault() call\ndereferences it -- a use-after-free.\n\nFix this by saving ip_blkno as a plain integer before calling\nfilemap_fault(), and removing vma from the trace event. Since\nip_blkno is copied by value before the lock can be dropped, it\nremains valid regardless of what happens to the vma or inode\nafterward."
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        "dateUpdated": "2026-04-24T14:42:22.655Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      ],
      "title": "ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31597",
    "datePublished": "2026-04-24T14:42:22.655Z",
    "dateReserved": "2026-03-09T15:48:24.121Z",
    "dateUpdated": "2026-04-24T14:42:22.655Z",
    "state": "PUBLISHED"
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  }
}


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  • 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.
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  • 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.



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