CVE-2026-80598 (GCVE-0-2026-80598)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:48 – Updated: 2026-08-30 07:08
VLAI
Title
ntfs3: fix out-of-bounds read in decompress_lznt
Summary
In the Linux kernel, the following vulnerability has been resolved: ntfs3: fix out-of-bounds read in decompress_lznt decompress_lznt() does not validate array index bounds before accessing the decompression table. A corrupted NTFS3 image with invalid compressed data can trigger an out-of-bounds read. Add index bounds checking to prevent the OOB access.
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 CPE status
Linux Linux Affected: 522e010b58379fbe19b38fdef5016bca0c3cf405 , < 1113fa5b01a47a1a4cdbb9c695197ca6215f02a8 (git)
Affected: 522e010b58379fbe19b38fdef5016bca0c3cf405 , < 61415ffa365d2eca6986914afd0d1412444aa1dd (git)
Affected: 522e010b58379fbe19b38fdef5016bca0c3cf405 , < bd77afca2ae9b6d44d37902e3ad672ebb028b070 (git)
Affected: 522e010b58379fbe19b38fdef5016bca0c3cf405 , < c694f8ea2611e7413b3f04ee47e04a9b7b45817b (git)
Affected: 522e010b58379fbe19b38fdef5016bca0c3cf405 , < ff05a98150ebb2b03919a9c05c576681e86abbb7 (git)
Affected: 522e010b58379fbe19b38fdef5016bca0c3cf405 , < a93980141253c932aa6ae5d4422d90e0162dc774 (git)
Affected: 522e010b58379fbe19b38fdef5016bca0c3cf405 , < 7160a57192fb16d7a6fa9b7f5c7ac341d2444a89 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: fix out-of-bounds read in decompress_lznt\n\ndecompress_lznt() does not validate array index bounds before accessing\nthe decompression table. A corrupted NTFS3 image with invalid compressed\ndata can trigger an out-of-bounds read.\n\nAdd index bounds checking to prevent the OOB access."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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              "lang": "en",
              "value": "AV:L - decompress_lznt() is reached only when the kernel reads LZNT-compressed NTFS file data through local VFS paths (read/mmap/write on compressed files) after an ntfs3 mount; it is not invoked from network protocol parsers such as nfsd, ksmbd, or the TCP/IP stack.\nAC:L - Attacker fully controls the on-disk LZNT compressed stream in a crafted file/image and can reliably drive the index past s_max_off[] bounds to trigger the out-of-bounds read; syzbot/syzkaller reproduced this without races or attacker-uncontrollable memory layout.\nPR:L - Triggering decompression requires only read access to a compressed file via open/read/mmap, or mounting a malicious NTFS image which needs CAP_SYS_ADMIN obtainable by unprivileged users inside user+mount namespaces on typical Linux systems.\nUI:N - No separate victim action is required when the attacker has local access: they can mount a crafted NTFS image in a user namespace and read the malicious compressed file themselves to reach decompress_lznt() without anyone else interacting with the system.\nS:U - The flaw corrupts or discloses kernel memory during NTFS LZNT decompression within the same kernel security domain; it does not cross VM, container, or IOMMU boundaries and is not a sandbox or hypervisor escape.\nC:H - The bug performs out-of-bounds reads of kernel memory past the nine-element s_max_off[] table in .rodata, and attacker-controlled index values feed parse_pair() and decompression output, enabling disclosure of sensitive kernel data into page-cache buffers returned to userspace.\nI:H - Unbounded index growth from malformed LZNT input passes attacker-influenced shift widths into parse_pair(), producing malformed backreference offset/length pairs that drive the LZ copy loop and can corrupt kernel page-cache memory in ways chainable toward arbitrary write primitives.\nA:H - Out-of-bounds access to s_max_off[] is a kernel memory safety violation that KASAN/KFENCE report and can oops or panic the kernel; repeated reads of a malicious compressed file can reliably deny service to the reading process or the entire system."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/7160a57192fb16d7a6fa9b7f5c7ac341d2444a89"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80598",
    "datePublished": "2026-08-28T06:48:24.097Z",
    "dateReserved": "2026-08-26T14:34:25.771Z",
    "dateUpdated": "2026-08-30T07:08:34.000Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-09-01",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T09:07:31+00:00",
      "cve": "CVE-2026-80598",
      "id": "CVE-2026-80598",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ntfs3: fix out-of-bounds read in decompress_lznt",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80598.json",
      "version": "3"
    }
  }
}



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Sightings

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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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.