CVE-2026-72033 (GCVE-0-2026-72033)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-17 05:39
VLAI
Title
orangefs: keep the readdir entry size 64-bit in fill_from_part()
Summary
In the Linux kernel, the following vulnerability has been resolved: orangefs: keep the readdir entry size 64-bit in fill_from_part() fill_from_part() computes the size of a directory entry in size_t but stores it in a __u32. An entry length near U32_MAX wraps it to a small value, bypasses the bounds check, and is then used to index the entry, reading far past the directory part -- an out-of-bounds read that oopses the kernel. Compute the size as a u64 so it cannot truncate; the bounds check then rejects the entry. The trailer is supplied by the userspace client.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 480e3e532e31666a18520a7964bb4095d7a16b9a , < 1679780f482feeb82acb5995587d4fb1d1fe82fd (git)
Affected: 480e3e532e31666a18520a7964bb4095d7a16b9a , < a72bbb43689591c9d36e3bb45c2d4e688cf92682 (git)
Affected: 480e3e532e31666a18520a7964bb4095d7a16b9a , < 36723b28e3293047f087f4501f1ef4ead418dd84 (git)
Affected: 480e3e532e31666a18520a7964bb4095d7a16b9a , < 07c05601a9a8e5d4481b2a4a16dc0e3c5bc63ad9 (git)
Affected: 480e3e532e31666a18520a7964bb4095d7a16b9a , < fdf06a1b66ff39664b01c6bb6a2aa98d81e8ebe1 (git)
Affected: 480e3e532e31666a18520a7964bb4095d7a16b9a , < 82fc886e244c76fadf05ef1958aaf8815478ccde (git)
Affected: 480e3e532e31666a18520a7964bb4095d7a16b9a , < e3d325c0bdb7bc5d1b4cc8d8441d79794cd03729 (git)
Affected: 480e3e532e31666a18520a7964bb4095d7a16b9a , < 18227a6bc98bd0ba96ed3ce9d5b28776a5a28dfc (git)
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Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (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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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\norangefs: keep the readdir entry size 64-bit in fill_from_part()\n\nfill_from_part() computes the size of a directory entry in size_t but\nstores it in a __u32. An entry length near U32_MAX wraps it to a small\nvalue, bypasses the bounds check, and is then used to index the entry,\nreading far past the directory part -- an out-of-bounds read that oopses\nthe kernel.\n\nCompute the size as a u64 so it cannot truncate; the bounds check then\nrejects the entry. The trailer is supplied by the userspace client."
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              "lang": "en",
              "value": "AV:N - fill_from_part() parses readdir trailer bytes relayed by pvfs2-client-core from an OrangeFS/PVFS server over the cluster network; a malicious or compromised server can supply crafted directory-entry lengths that reach the kernel during getdents on HPC client nodes without local shell access.\nAC:L - An entry length near U32_MAX makes padlen truncate to a small __u32, reliably bypassing the bounds check and forcing the subsequent s[*len] probe; the attacker fully controls the trailer fields and no race, heap layout, or timing condition beyond readdir is required.\nPR:N - A remote malicious OrangeFS/PVFS metadata server needs no account, capabilities, or namespaces on victim HPC compute nodes; once clients mount the filesystem, any process with directory read access can trigger parsing of attacker-supplied trailer bytes.\nUI:N - No victim interaction is required beyond normal automated directory scans (cron, parallel job launchers, monitoring); the attacker does not need a user to mount the filesystem or click anything\u2014only pre-existing cluster mounts to the compromised server.\nS:U - The out-of-bounds read and resulting kernel oops occur entirely within the victim client\u0027s kernel address space during VFS readdir processing; there is no inherent crossing of VM, container, IOMMU, or sandbox security boundaries.\nC:H - The integer truncation lets the kernel index gigabytes past the vzalloc readdir part buffer via s[*len], an unbounded out-of-bounds read over adjacent kernel memory before the fault; per CNA guidance OOB reads of this class are rated High.\nI:H - The bounds bypass is a memory-corruption class flaw that can reach beyond the allocated directory part into adjacent kernel heap; even though the immediate access is a read, CNA guidance rates such unchecked OOB probes as High integrity impact due to exploit chaining potential.\nA:H - The maintainer confirmed the out-of-bounds read oopses the kernel; the inflated index can touch unmapped pages far outside the PART_SIZE-limited trailer buffer, causing a kernel fault, panic, or node crash on HPC clients during routine readdir."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2026-72033",
    "datePublished": "2026-08-15T05:51:55.102Z",
    "dateReserved": "2026-08-09T03:40:39.901Z",
    "dateUpdated": "2026-08-17T05:39:36.089Z",
    "state": "PUBLISHED"
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      "date": "2026-08-17",
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    "redhat_vex": {
      "current_release_date": "2026-08-17T17:48:18+00:00",
      "cve": "CVE-2026-72033",
      "id": "CVE-2026-72033",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: orangefs: keep the readdir entry size 64-bit in fill_from_part()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72033.json",
      "version": "3"
    }
  }
}



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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

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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.
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  • 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.