CVE-2026-64318 (GCVE-0-2026-64318)
Vulnerability from cvelistv5
Published
2026-07-25 08:49
Modified
2026-08-17 04:53
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6
Version: 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6
Version: 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6
Version: 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6
Version: 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6
Version: 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6
Version: 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6
Version: 6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "block/partitions/aix.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "status": "affected",
              "version": "6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6",
              "versionType": "git"
            },
            {
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            {
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            },
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              "versionType": "git"
            },
            {
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "block/partitions/aix.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.11"
            },
            {
              "lessThan": "3.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.261",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.212",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.96",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.39",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.4",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - An attacker with local code execution can supply a crafted image through an unprivileged UDisks loop-setup operation with partition scanning enabled. No network protocol directly invokes this parser.\nAC:L - On an affected build, attacker-controlled on-disk fields deterministically reach the oversized scan without a race or memory-layout requirement for triggering the out-of-bounds access.\nPR:L - A basic active desktop user can request loop setup through UDisks under its default policy, while the kernel loop configuration path itself has no capability check. Initial-namespace root is not required in this deployment.\nUI:N - The attacker can initiate loop setup and partition scanning directly, without requiring another user to mount or open the image.\nS:U - The vulnerable partition parser and the affected kernel memory belong to the same operating-system security authority, with no demonstrated VM, IOMMU, or sandbox boundary crossing.\nC:H - The attacker-controlled count can cause 16-bit reads across nearly 2 MiB beyond the approximately 32 KiB allocation, sampling unrelated kernel memory. This is substantially more than a small bounded disclosure.\nI:N - The faulty accesses are reads; the derived logical-volume index is range-checked, and subsequent writes remain within the allocated lvip and partition-state arrays. No out-of-bounds write or control-flow write primitive is present.\nA:H - The slab out-of-bounds access is KASAN-confirmed and can produce an oops or panic on hardened kernels or when the traversal reaches inaccessible memory. An attacker can repeat partition scans to sustain denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:53:18.783Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/09861651617ba0fec089e8b9477439e68398c110"
        },
        {
          "url": "https://git.kernel.org/stable/c/5eacdb1967378f5e5591cd27a2d8cdee2df1a599"
        },
        {
          "url": "https://git.kernel.org/stable/c/b5e9c09309e18fd9839ad007c238120353ca0cc4"
        },
        {
          "url": "https://git.kernel.org/stable/c/fd94a779020f2ecc8b2607f4c20b34acb1763b9a"
        },
        {
          "url": "https://git.kernel.org/stable/c/4671bb74bba05fdd4acf670a35758c29e8c97b83"
        },
        {
          "url": "https://git.kernel.org/stable/c/ce93228e2193a17d2c58b656e439bb39fe5c3af8"
        },
        {
          "url": "https://git.kernel.org/stable/c/44f37ee92fdcd377c41bdf6a31cdd8cc7d4c410e"
        },
        {
          "url": "https://git.kernel.org/stable/c/2dc0bfd2fe355fb930de63c2f2eb8ced8570c579"
        }
      ],
      "title": "partitions: aix: bound the pp_count scan to the ppe array",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64318",
    "datePublished": "2026-07-25T08:49:47.690Z",
    "dateReserved": "2026-07-19T15:36:31.779Z",
    "dateUpdated": "2026-08-17T04:53:18.783Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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