ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY

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Summary

CVECVE-2026-31597
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:37 UTC
Updated2026-06-01 17:16:50 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000180000 probability, percentile 0.048130000 (date 2026-04-27)

Problem Types: CWE-416

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 614a9e849ca6ea24843795251cb30af525d5336b 36539c4d536f851a3b346a6ebb27b51bc3d77a94 git Not specified
CNA Linux Linux affected 614a9e849ca6ea24843795251cb30af525d5336b 35c2c05261d6f6d84aaa1355afa201d507943e76 git Not specified
CNA Linux Linux affected 614a9e849ca6ea24843795251cb30af525d5336b 3f5e74b5db9353b01ed50f4de84e75b755f8fbc2 git Not specified
CNA Linux Linux affected 614a9e849ca6ea24843795251cb30af525d5336b 6f072daefcab1d84ce37c073645615f63be91006 git Not specified
CNA Linux Linux affected 614a9e849ca6ea24843795251cb30af525d5336b 4cf2768a0291a0cdd0dae801ea0eafa3878a349d git Not specified
CNA Linux Linux affected 614a9e849ca6ea24843795251cb30af525d5336b d45ff441b416d4aa1af72b1db23d959601c04da2 git Not specified
CNA Linux Linux affected 614a9e849ca6ea24843795251cb30af525d5336b 76a602fdbb78dd05b2da06f74a988cebc97e82d0 git Not specified
CNA Linux Linux affected 614a9e849ca6ea24843795251cb30af525d5336b 925bf22c1b823e231b1baea761fe8a1512e442f2 git Not specified
CNA Linux Linux affected 614a9e849ca6ea24843795251cb30af525d5336b 7de554cabf160e331e4442e2a9ad874ca9875921 git Not specified
CNA Linux Linux affected 2.6.39 Not specified
CNA Linux Linux unaffected 2.6.39 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0.1 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d45ff441b416d4aa1af72b1db23d959601c04da2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3f5e74b5db9353b01ed50f4de84e75b755f8fbc2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/925bf22c1b823e231b1baea761fe8a1512e442f2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4cf2768a0291a0cdd0dae801ea0eafa3878a349d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/76a602fdbb78dd05b2da06f74a988cebc97e82d0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/36539c4d536f851a3b346a6ebb27b51bc3d77a94 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7de554cabf160e331e4442e2a9ad874ca9875921 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6f072daefcab1d84ce37c073645615f63be91006 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/35c2c05261d6f6d84aaa1355afa201d507943e76 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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