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

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-06-14 17:42
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
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
Linux Linux Affected: 614a9e849ca6ea24843795251cb30af525d5336b , < 36539c4d536f851a3b346a6ebb27b51bc3d77a94 (git)
Affected: 614a9e849ca6ea24843795251cb30af525d5336b , < 35c2c05261d6f6d84aaa1355afa201d507943e76 (git)
Affected: 614a9e849ca6ea24843795251cb30af525d5336b , < 3f5e74b5db9353b01ed50f4de84e75b755f8fbc2 (git)
Affected: 614a9e849ca6ea24843795251cb30af525d5336b , < 6f072daefcab1d84ce37c073645615f63be91006 (git)
Affected: 614a9e849ca6ea24843795251cb30af525d5336b , < 4cf2768a0291a0cdd0dae801ea0eafa3878a349d (git)
Affected: 614a9e849ca6ea24843795251cb30af525d5336b , < d45ff441b416d4aa1af72b1db23d959601c04da2 (git)
Affected: 614a9e849ca6ea24843795251cb30af525d5336b , < 76a602fdbb78dd05b2da06f74a988cebc97e82d0 (git)
Affected: 614a9e849ca6ea24843795251cb30af525d5336b , < 925bf22c1b823e231b1baea761fe8a1512e442f2 (git)
Affected: 614a9e849ca6ea24843795251cb30af525d5336b , < 7de554cabf160e331e4442e2a9ad874ca9875921 (git)
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Linux Linux Affected: 2.6.39
Unaffected: 0 , < 2.6.39 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
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)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T07:26:43+00:00",
      "cve": "CVE-2026-31597",
      "id": "CVE-2026-31597",
      "initial_release_date": "2026-04-24T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31597.json",
      "version": "3"
    }
  }
}



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Taxonomy of the tags.





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.