CVE-2026-98831 (GCVE-0-2026-98831)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:49 – Updated: 2026-10-21 12:57
VLAI
Title
of/overlay: don't leak fragment references when changeset init fails
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 61b4de4e0b384f4a22c55c3bada604da49cec4e1 , < 702b5db6e7b3865be70675d57d6fd7dde80d02b6 (git)
Affected: 61b4de4e0b384f4a22c55c3bada604da49cec4e1 , < 894573e2fdaeb1b15030b7eebc22615edf28a6cd (git)
Affected: 61b4de4e0b384f4a22c55c3bada604da49cec4e1 , < 7a46f1917b320cc8762183b802301da02a191b6a (git)
Affected: 61b4de4e0b384f4a22c55c3bada604da49cec4e1 , < 3a23fb158ba517b77a2e5258263bdfdaa480f758 (git)
Affected: 61b4de4e0b384f4a22c55c3bada604da49cec4e1 , < 1d62f0f2bc7edb12ed09f71203df0e47fa4efca4 (git)
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Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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{
  "containers": {
    "cna": {
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        {
          "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",
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
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        {
          "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": "2026-10-21T12:57:18.542Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        },
        {
          "url": "https://git.kernel.org/stable/c/1d62f0f2bc7edb12ed09f71203df0e47fa4efca4"
        }
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      "title": "of/overlay: don\u0027t leak fragment references when changeset init fails",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98831",
    "datePublished": "2026-10-18T15:49:32.909Z",
    "dateReserved": "2026-09-25T10:25:14.372Z",
    "dateUpdated": "2026-10-21T12:57:18.542Z",
    "state": "PUBLISHED"
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      "initial_release_date": "2026-10-20T01:02:52.000Z",
      "product_status:known_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "of/overlay: don\u0027t leak fragment references when changeset init fails",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98831.json",
      "version": "2"
    },
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            "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."
          }
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        "metrics": {},
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      "product_status:known_affected": "126",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: of/overlay: don\u0027t leak fragment references when changeset init fails",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98831.json",
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      "status": "interim",
      "title": "SUSE CVE CVE-2026-98831",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98831.json",
      "version": "2"
    }
  }
}



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