CVE-2026-98831 (GCVE-0-2026-98831)
Vulnerability from cvelistv5
Published
2026-10-18 15:49
Modified
2026-10-30 12:40
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: of/overlay: don't leak fragment references when changeset init fails init_overlay_changeset() stores the number of initialized fragments in ovcs->count only on full success. When find_target() or the __symbols__ lookup fails partway through, the target and overlay references taken for the fragments initialized so far are never dropped: free_overlay_changeset() bounds its cleanup loop by ovcs->count, which is still 0. Store the running count on the error path so free_overlay_changeset() puts whatever was set up. The store is guarded by ovcs->fragments because on the allocation-failure path cnt still holds the counting pass total while there is no fragments array; everywhere else cnt only counts fully-initialized fragments.
References
Impacted products
Vendor Product Version
Linux Linux Version: 61b4de4e0b384f4a22c55c3bada604da49cec4e1
Version: 61b4de4e0b384f4a22c55c3bada604da49cec4e1
Version: 61b4de4e0b384f4a22c55c3bada604da49cec4e1
Version: 61b4de4e0b384f4a22c55c3bada604da49cec4e1
Version: 61b4de4e0b384f4a22c55c3bada604da49cec4e1
Version: 61b4de4e0b384f4a22c55c3bada604da49cec4e1
Version: 61b4de4e0b384f4a22c55c3bada604da49cec4e1
Version: 61b4de4e0b384f4a22c55c3bada604da49cec4e1
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/of/overlay.c"
          ],
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.15"
            },
            {
              "lessThan": "4.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.273",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.224",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
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            },
            {
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              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
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            {
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              "version": "6.18.56",
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              "version": "7.2.10",
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            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.273",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
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                  "versionEndExcluding": "7.3",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nof/overlay: don\u0027t leak fragment references when changeset init fails\n\ninit_overlay_changeset() stores the number of initialized fragments\nin ovcs-\u003ecount only on full success. When find_target() or the\n__symbols__ lookup fails partway through, the target and overlay\nreferences taken for the fragments initialized so far are never\ndropped: free_overlay_changeset() bounds its cleanup loop by\novcs-\u003ecount, which is still 0.\n\nStore the running count on the error path so free_overlay_changeset()\nputs whatever was set up. The store is guarded by ovcs-\u003efragments\nbecause on the allocation-failure path cnt still holds the counting\npass total while there is no fragments array; everywhere else cnt\nonly counts fully-initialized fragments."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:40:03.420Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c654f283d7db20648a5bbf979209f78d4fa9be3f"
        },
        {
          "url": "https://git.kernel.org/stable/c/64517aeaa3d8b158e4d01321a095be48cb551251"
        },
        {
          "url": "https://git.kernel.org/stable/c/bbe3dc64b28a14bd9ecb514bbf5115ac8472ed80"
        },
        {
          "url": "https://git.kernel.org/stable/c/702b5db6e7b3865be70675d57d6fd7dde80d02b6"
        },
        {
          "url": "https://git.kernel.org/stable/c/894573e2fdaeb1b15030b7eebc22615edf28a6cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/7a46f1917b320cc8762183b802301da02a191b6a"
        },
        {
          "url": "https://git.kernel.org/stable/c/3a23fb158ba517b77a2e5258263bdfdaa480f758"
        },
        {
          "url": "https://git.kernel.org/stable/c/1d62f0f2bc7edb12ed09f71203df0e47fa4efca4"
        }
      ],
      "title": "of/overlay: don\u0027t leak fragment references when changeset init fails",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98831",
    "datePublished": "2026-10-18T15:49:32.909Z",
    "dateReserved": "2026-09-25T10:25:14.372Z",
    "dateUpdated": "2026-10-30T12:40:03.420Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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