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

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-08-05 12:23
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)
Create a notification for this product.
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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          "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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        {
          "cvssV3_1": {
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              "value": "AV:L - The vulnerable path is reached by local user memory-management operations on an OCFS2 regular file mapping, via mmap/page fault and concurrent unmap. It is not directly reachable from network packets or adjacent/physical interfaces.\nAC:L - The attacker can control the relevant mmap, page fault, and munmap activity from their own process or cooperating threads. The VM_FAULT_RETRY window is a normal retry path where filemap_fault() may drop mmap_lock, so the race is attacker-repeatable.\nPR:L - A basic local user with permission to open and mmap a file on an already-mounted OCFS2 filesystem can reach ocfs2_fault(); no kernel capability is needed for the fault/unmap path. Mounting OCFS2 itself is privileged, but a reasonable OCFS2 deployment already has the filesystem mounted.\nUI:N - Exploitation does not require a separate victim action after the attacker has local access. The attacker triggers the mmap, page fault, and munmap operations directly.\nS:U - The vulnerability is in kernel filesystem/MM handling and impacts the same kernel security authority. This is standard local kernel compromise/DoS territory, not a cross-scope VM or sandbox boundary by itself.\nC:H - This is a kernel heap use-after-free of a vm_area_struct after mmap_lock can be dropped and the VMA freed. Under the stated kernel guidance, use-after-free bugs are scored High for confidentiality because freed object reuse can enable kernel memory disclosure.\nI:H - Although the observed KASAN report is a UAF read, it is still a dangling kernel heap object use in attacker-influenced VMA lifetime/reuse conditions. Under the stated guidance and uncertainty rule, UAF memory corruption is scored High for integrity.\nA:H - The bug has a demonstrated KASAN slab-use-after-free in ocfs2_fault() and can crash/oops the kernel. Kernel crash availability impact is High."
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        {
          "url": "https://git.kernel.org/stable/c/7de554cabf160e331e4442e2a9ad874ca9875921"
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      "title": "ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY",
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    "cveId": "CVE-2026-31597",
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    "dateReserved": "2026-03-09T15:48:24.121Z",
    "dateUpdated": "2026-08-05T12:23:41.347Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-31597",
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      "source": "Microsoft CSAF VEX",
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      "title": "ocfs2: fix use-after-free in ocfs2_fault() when VM_FAULT_RETRY",
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ocfs2/mmap.c\",\"fs/ocfs2/ocfs2_trace.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"614a9e849ca6ea24843795251cb30af525d5336b\",\"lessThan\":\"36539c4d536f851a3b346a6ebb27b51bc3d77a94\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"614a9e849ca6ea24843795251cb30af525d5336b\",\"lessThan\":\"35c2c05261d6f6d84aaa1355afa201d507943e76\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"614a9e849ca6ea24843795251cb30af525d5336b\",\"lessThan\":\"3f5e74b5db9353b01ed50f4de84e75b755f8fbc2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"614a9e849ca6ea24843795251cb30af525d5336b\",\"lessThan\":\"6f072daefcab1d84ce37c073645615f63be91006\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"614a9e849ca6ea24843795251cb30af525d5336b\",\"lessThan\":\"4cf2768a0291a0cdd0dae801ea0eafa3878a349d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"614a9e849ca6ea24843795251cb30af525d5336b\",\"lessThan\":\"d45ff441b416d4aa1af72b1db23d959601c04da2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"614a9e849ca6ea24843795251cb30af525d5336b\",\"lessThan\":\"76a602fdbb78dd05b2da06f74a988cebc97e82d0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"614a9e849ca6ea24843795251cb30af525d5336b\",\"lessThan\":\"925bf22c1b823e231b1baea761fe8a1512e442f2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"614a9e849ca6ea24843795251cb30af525d5336b\",\"lessThan\":\"7de554cabf160e331e4442e2a9ad874ca9875921\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ocfs2/mmap.c\",\"fs/ocfs2/ocfs2_trace.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.39\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.39\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.136\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.83\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.24\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.14\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.1\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.39\",\"versionEndExcluding\":\"6.6.136\",\"matchCriteriaId\":\"860F82EF-76BF-492E-B7CE-559EC99F9C95\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.83\",\"matchCriteriaId\":\"7F0AE5B5-23AC-4DCC-B37A-51CA1DAE7BA8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.24\",\"matchCriteriaId\":\"8126B8B8-6D0B-4443-86C1-672AEE893555\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.14\",\"matchCriteriaId\":\"D6A8A074-BBF4-4803-ABED-519A839435BB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"7.0\",\"versionEndExcluding\":\"7.0.1\",\"matchCriteriaId\":\"9B5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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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-06T01:24:21Z",
      "cve": "CVE-2026-31597",
      "id": "CVE-2026-31597",
      "initial_release_date": "2026-04-25T01:38:25Z",
      "product_status:known_affected": "302",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31597",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31597.json",
      "version": "9"
    }
  }
}



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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.