CVE-2026-31716 (GCVE-0-2026-31716)

Vulnerability from cvelistv5 – Published: 2026-05-01 13:56 – Updated: 2026-08-05 12:24
VLAI
Title
fs/ntfs3: validate rec->used in journal-replay file record check
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: validate rec->used in journal-replay file record check check_file_record() validates rec->total against the record size but never validates rec->used. The do_action() journal-replay handlers read rec->used from disk and use it to compute memmove lengths: DeleteAttribute: memmove(attr, ..., used - asize - roff) CreateAttribute: memmove(..., attr, used - roff) change_attr_size: memmove(..., used - PtrOffset(rec, next)) When rec->used is smaller than the offset of a validated attribute, or larger than the record size, these subtractions can underflow allowing us to copy huge amounts of memory in to a 4kb buffer, generally considered a bad idea overall. This requires a corrupted filesystem, which isn't a threat model the kernel really needs to worry about, but checking for such an obvious out-of-bounds value is good to keep things robust, especially on journal replay Fix this up by bounding rec->used correctly. This is much like commit b2bc7c44ed17 ("fs/ntfs3: Fix slab-out-of-bounds read in DeleteIndexEntryRoot") which checked different values in this same switch statement.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 8e64d33198b5a0fb14a452708bad844f94f03b2c (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 1393a467a9607e62123806de7d4c3a3e54e396a9 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < f90b8a1798b750755a9e9aee66678f0a1820bbaf (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 4b1613d7e2deda831a97e427d1ea586e50fe1be5 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 0112e6279420d4005b3d57af36fb45c01b8d0116 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < f79d0403ea20a81bc29105bba54fbcab54e8c403 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 0ca0485e4b2e837ebb6cbd4f2451aba665a03e4b (git)
Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.84 , ≤ 6.12.* (semver)
Unaffected: 6.18.25 , ≤ 6.18.* (semver)
Unaffected: 7.0.2 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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              "value": "AV:L - The vulnerable ntfs3 journal replay code is reached when the target mounts or otherwise processes a crafted NTFS block device/image, which is a local filesystem parsing path rather than a network protocol. Physical removable media is one delivery route, but local image/block-device mounting is also reasonable.\nAC:L - The attacker controls the corrupt NTFS metadata and journal records, including the `rec-\u003eused` value and replay operation needed to trigger the underflowed `memmove()` length. No race or external timing condition is required.\nPR:N - Direct self-triggered mounting is gated by `CAP_SYS_ADMIN` and ntfs3 is not user-namespace mountable, but the highest reasonable scenario is an attacker-supplied NTFS image/media mounted by a victim or automounter. In that scenario the attacker needs no privileges on the target.\nUI:R - Exploitation requires the target system or user to mount/process the crafted NTFS filesystem so journal replay runs. The attacker cannot reach this ntfs3 path solely by sending packets.\nS:U - The impact remains within the same kernel security authority. This is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The bug creates out-of-bounds memory movement from attacker-controlled on-disk metadata into a small MFT record buffer, and the resulting kernel memory corruption/read exposure is not tightly bounded. When uncertain, the higher impact is appropriate.\nI:H - The underflowed `memmove()` length can overflow/corrupt kernel heap memory adjacent to the MFT record buffer. Such out-of-bounds write-style memory corruption is potentially exploitable for arbitrary modification or code execution.\nA:H - The same oversized `memmove()` can cause kernel heap corruption, faults, oopses, or panics during mount-time journal replay. This is a high availability impact."
            }
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The do_action() journal-replay handlers read\\nrec-\u003eused from disk and use it to compute memmove lengths:\\n\\n  DeleteAttribute:    memmove(attr, ..., used - asize - roff)\\n  CreateAttribute:    memmove(..., attr, used - roff)\\n  change_attr_size:   memmove(..., used - PtrOffset(rec, next))\\n\\nWhen rec-\u003eused is smaller than the offset of a validated attribute, or\\nlarger than the record size, these subtractions can underflow allowing\\nus to copy huge amounts of memory in to a 4kb buffer, generally\\nconsidered a bad idea overall.\\n\\nThis requires a corrupted filesystem, which isn\u0027t a threat model the\\nkernel really needs to worry about, but checking for such an obvious\\nout-of-bounds value is good to keep things robust, especially on journal\\nreplay\\n\\nFix this up by bounding rec-\u003eused correctly.\\n\\nThis is much like commit b2bc7c44ed17 (\\\"fs/ntfs3: Fix slab-out-of-bounds\\nread in DeleteIndexEntryRoot\\\") which checked different values in 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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T07:27:45+00:00",
      "cve": "CVE-2026-31716",
      "id": "CVE-2026-31716",
      "initial_release_date": "2026-05-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fs/ntfs3: validate rec-\u003eused in journal-replay file record check",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31716.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-02T16:37:49Z",
      "cve": "CVE-2026-31716",
      "id": "CVE-2026-31716",
      "initial_release_date": "2026-05-02T01:25:12Z",
      "product_status:known_not_affected": "293",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31716",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31716.json",
      "version": "8"
    }
  }
}



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Tags
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.