Vulnerability-Lookup

CVE-2026-64318 (GCVE-0-2026-64318)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-07-25 08:49

Title

partitions: aix: bound the pp_count scan to the ppe array

Summary

In the Linux kernel, the following vulnerability has been resolved: partitions: aix: bound the pp_count scan to the ppe array aix_partition() reads the physical volume descriptor into a fixed-size struct pvd and then scans its physical-partition-extent array: int numpps = be16_to_cpu(pvd->pp_count); ... for (i = 0; i < numpps; i += 1) { struct ppe *p = pvd->ppe + i; ... lp_ix = be16_to_cpu(p->lp_ix); pvd points at a single kmalloc()'d struct pvd whose ppe[] member holds a fixed ARRAY_SIZE(pvd->ppe) (1016) entries, but the loop runs up to the on-disk pp_count. pp_count is an unvalidated __be16 read straight from the descriptor, so a crafted AIX image with pp_count larger than 1016 drives the loop to read pvd->ppe[i] past the end of the allocation (up to 65535 entries, ~2 MB out of bounds). The partition scan runs without mounting anything, when a block device with a crafted AIX/IBM partition table appears (an attacker-supplied image attached with losetup -P, or a device auto-scanned by udev), via msdos_partition() -> aix_partition(). Clamp the scan to the number of entries the ppe[] array can hold.

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/09861651617ba0fec…
https://git.kernel.org/stable/c/5eacdb1967378f5e5…
https://git.kernel.org/stable/c/b5e9c09309e18fd98…
https://git.kernel.org/stable/c/fd94a779020f2ecc8…
https://git.kernel.org/stable/c/4671bb74bba05fdd4…
https://git.kernel.org/stable/c/ce93228e2193a17d2…
https://git.kernel.org/stable/c/44f37ee92fdcd377c…
https://git.kernel.org/stable/c/2dc0bfd2fe355fb93…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 , < 09861651617ba0fec089e8b9477439e68398c110 (git) Affected: 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 , < 5eacdb1967378f5e5591cd27a2d8cdee2df1a599 (git) Affected: 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 , < b5e9c09309e18fd9839ad007c238120353ca0cc4 (git) Affected: 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 , < fd94a779020f2ecc8b2607f4c20b34acb1763b9a (git) Affected: 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 , < 4671bb74bba05fdd4acf670a35758c29e8c97b83 (git) Affected: 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 , < ce93228e2193a17d2c58b656e439bb39fe5c3af8 (git) Affected: 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 , < 44f37ee92fdcd377c41bdf6a31cdd8cc7d4c410e (git) Affected: 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 , < 2dc0bfd2fe355fb930de63c2f2eb8ced8570c579 (git)
Linux	Linux	Affected: 3.11 Unaffected: 0 , < 3.11 (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: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npartitions: aix: bound the pp_count scan to the ppe array\n\naix_partition() reads the physical volume descriptor into a fixed-size\nstruct pvd and then scans its physical-partition-extent array:\n\n\tint numpps = be16_to_cpu(pvd-\u003epp_count);\n\t...\n\tfor (i = 0; i \u003c numpps; i += 1) {\n\t\tstruct ppe *p = pvd-\u003eppe + i;\n\t\t...\n\t\tlp_ix = be16_to_cpu(p-\u003elp_ix);\n\npvd points at a single kmalloc()\u0027d struct pvd whose ppe[] member holds a\nfixed ARRAY_SIZE(pvd-\u003eppe) (1016) entries, but the loop runs up to the\non-disk pp_count.  pp_count is an unvalidated __be16 read straight from\nthe descriptor, so a crafted AIX image with pp_count larger than 1016\ndrives the loop to read pvd-\u003eppe[i] past the end of the allocation (up\nto 65535 entries, ~2 MB out of bounds).\n\nThe partition scan runs without mounting anything, when a block device\nwith a crafted AIX/IBM partition table appears (an attacker-supplied\nimage attached with losetup -P, or a device auto-scanned by udev), via\nmsdos_partition() -\u003e aix_partition().\n\nClamp the scan to the number of entries the ppe[] array can hold."
        }
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        "dateUpdated": "2026-07-25T08:49:47.690Z",
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    "datePublished": "2026-07-25T08:49:47.690Z",
    "dateReserved": "2026-07-19T15:36:31.779Z",
    "dateUpdated": "2026-07-25T08:49:47.690Z",
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from\\nthe descriptor, so a crafted AIX image with pp_count larger than 1016\\ndrives the loop to read pvd-\u003eppe[i] past the end of the allocation (up\\nto 65535 entries, ~2 MB out of bounds).\\n\\nThe partition scan runs without mounting anything, when a block device\\nwith a crafted AIX/IBM partition table appears (an attacker-supplied\\nimage attached with losetup -P, or a device auto-scanned by udev), via\\nmsdos_partition() -\u003e aix_partition().\\n\\nClamp the scan to the number of entries the ppe[] array can 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    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:45:50Z",
      "cve": "CVE-2026-64318",
      "id": "CVE-2026-64318",
      "initial_release_date": "2026-07-25T16:45:50Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64318",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64318.json",
      "version": "2"
    }
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}

GHSA-499P-P84W-R6W8

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

partitions: aix: bound the pp_count scan to the ppe array

aix_partition() reads the physical volume descriptor into a fixed-size struct pvd and then scans its physical-partition-extent array:

int numpps = be16_to_cpu(pvd->pp_count);
...
for (i = 0; i < numpps; i += 1) {
    struct ppe *p = pvd->ppe + i;
    ...
    lp_ix = be16_to_cpu(p->lp_ix);

pvd points at a single kmalloc()'d struct pvd whose ppe[] member holds a fixed ARRAY_SIZE(pvd->ppe) (1016) entries, but the loop runs up to the on-disk pp_count. pp_count is an unvalidated __be16 read straight from the descriptor, so a crafted AIX image with pp_count larger than 1016 drives the loop to read pvd->ppe[i] past the end of the allocation (up to 65535 entries, ~2 MB out of bounds).

The partition scan runs without mounting anything, when a block device with a crafted AIX/IBM partition table appears (an attacker-supplied image attached with losetup -P, or a device auto-scanned by udev), via msdos_partition() -> aix_partition().

Clamp the scan to the number of entries the ppe[] array can hold.

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64318"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:13Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npartitions: aix: bound the pp_count scan to the ppe array\n\naix_partition() reads the physical volume descriptor into a fixed-size\nstruct pvd and then scans its physical-partition-extent array:\n\n\tint numpps = be16_to_cpu(pvd-\u003epp_count);\n\t...\n\tfor (i = 0; i \u003c numpps; i += 1) {\n\t\tstruct ppe *p = pvd-\u003eppe + i;\n\t\t...\n\t\tlp_ix = be16_to_cpu(p-\u003elp_ix);\n\npvd points at a single kmalloc()\u0027d struct pvd whose ppe[] member holds a\nfixed ARRAY_SIZE(pvd-\u003eppe) (1016) entries, but the loop runs up to the\non-disk pp_count.  pp_count is an unvalidated __be16 read straight from\nthe descriptor, so a crafted AIX image with pp_count larger than 1016\ndrives the loop to read pvd-\u003eppe[i] past the end of the allocation (up\nto 65535 entries, ~2 MB out of bounds).\n\nThe partition scan runs without mounting anything, when a block device\nwith a crafted AIX/IBM partition table appears (an attacker-supplied\nimage attached with losetup -P, or a device auto-scanned by udev), via\nmsdos_partition() -\u003e aix_partition().\n\nClamp the scan to the number of entries the ppe[] array can hold.",
  "id": "GHSA-499p-p84w-r6w8",
  "modified": "2026-07-25T12:31:31Z",
  "published": "2026-07-25T12:31:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64318"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/09861651617ba0fec089e8b9477439e68398c110"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2dc0bfd2fe355fb930de63c2f2eb8ced8570c579"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/44f37ee92fdcd377c41bdf6a31cdd8cc7d4c410e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4671bb74bba05fdd4acf670a35758c29e8c97b83"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5eacdb1967378f5e5591cd27a2d8cdee2df1a599"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b5e9c09309e18fd9839ad007c238120353ca0cc4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ce93228e2193a17d2c58b656e439bb39fe5c3af8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fd94a779020f2ecc8b2607f4c20b34acb1763b9a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64318 (GCVE-0-2026-64318)

GHSA-499P-P84W-R6W8

Tags

Sightings

Nomenclature