FKIE_CVE-2026-89834

Vulnerability from fkie_nvd - Published: 2026-09-16 11:16 - Updated: 2026-09-16 11:16
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to migrate all curseg types during free_segment_range In free_segment_range(), the curseg evacuation loop only iterates up to NR_CURSEG_PERSIST_TYPE (0..5), missing non-persistent in-memory curseg types such as CURSEG_COLD_DATA_PINNED and CURSEG_ALL_DATA_ATGC. Even though these in-memory curseg types are not saved in the on-disk checkpoint header, they still occupy active physical segments at runtime. If an active in-memory curseg happens to be allocated within the segment range being truncated during filesystem shrink, failing to evacuate it will cause subsequent writes to the curseg attempting out-of-bounds I/O on the truncated storage range. Fix this by expanding the curseg evacuation loop upper bound to NR_CURSEG_TYPE to ensure all active curseg types are safely migrated out of the target range.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3b85edf3391f3e1f624f409a7d2d239885f567b7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b8ae1228c153622afa71a179c9d4dc268117e0f0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b9776094aa7118e8e5dfdcd791ffc8330c5ca408
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/gc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3b85edf3391f3e1f624f409a7d2d239885f567b7",
              "status": "affected",
              "version": "d0b9e42ab6155dc05fc83f00af9f45d4dd02264d",
              "versionType": "git"
            },
            {
              "lessThan": "b8ae1228c153622afa71a179c9d4dc268117e0f0",
              "status": "affected",
              "version": "d0b9e42ab6155dc05fc83f00af9f45d4dd02264d",
              "versionType": "git"
            },
            {
              "lessThan": "b9776094aa7118e8e5dfdcd791ffc8330c5ca408",
              "status": "affected",
              "version": "d0b9e42ab6155dc05fc83f00af9f45d4dd02264d",
              "versionType": "git"
            },
            {
              "lessThan": "8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1",
              "status": "affected",
              "version": "d0b9e42ab6155dc05fc83f00af9f45d4dd02264d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/gc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.10"
            },
            {
              "lessThan": "5.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to migrate all curseg types during free_segment_range\n\nIn free_segment_range(), the curseg evacuation loop only iterates up to\nNR_CURSEG_PERSIST_TYPE (0..5), missing non-persistent in-memory curseg\ntypes such as CURSEG_COLD_DATA_PINNED and CURSEG_ALL_DATA_ATGC.\n\nEven though these in-memory curseg types are not saved in the on-disk\ncheckpoint header, they still occupy active physical segments at runtime.\nIf an active in-memory curseg happens to be allocated within the segment\nrange being truncated during filesystem shrink, failing to evacuate it\nwill cause subsequent writes to the curseg attempting out-of-bounds I/O\non the truncated storage range.\n\nFix this by expanding the curseg evacuation loop upper bound to\nNR_CURSEG_TYPE to ensure all active curseg types are safely migrated\nout of the target range."
    }
  ],
  "id": "CVE-2026-89834",
  "lastModified": "2026-09-16T11:16:50.180",
  "metrics": {},
  "published": "2026-09-16T11:16:50.180",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3b85edf3391f3e1f624f409a7d2d239885f567b7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8ec06f50ddd8d201bd7e55b896ae28ed9d4cb7d1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b8ae1228c153622afa71a179c9d4dc268117e0f0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b9776094aa7118e8e5dfdcd791ffc8330c5ca408"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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