FKIE_CVE-2023-53826

Vulnerability from fkie_nvd - Published: 2025-12-09 16:17 - Updated: 2025-12-09 18:37
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show() Wear-leveling entry could be freed in error path, which may be accessed again in eraseblk_count_seq_show(), for example: __erase_worker eraseblk_count_seq_show wl = ubi->lookuptbl[*block_number] if (wl) wl_entry_destroy ubi->lookuptbl[e->pnum] = NULL kmem_cache_free(ubi_wl_entry_slab, e) erase_count = wl->ec // UAF! Wear-leveling entry updating/accessing in ubi->lookuptbl should be protected by ubi->wl_lock, fix it by adding ubi->wl_lock to serialize wl entry accessing between wl_entry_destroy() and eraseblk_count_seq_show(). Fetch a reproducer in [Link].
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1cb14c06d6035539ef4215c4ba0871aea71d7c38
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3f9b63dfce44a7c3c095dd93d910408e07ab1845
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/79548ccdd992707879b4b683b7251c58ddf26f12
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/84250da1c63cb7d421a3b4812b5c2ce2e47d31a1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/84253f3c2dad6be10d30c92626c763d9a9f512ad
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9d448dd6bcb61a508204b57ea1f454ba9bac2f24
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a100de2974d208cfca032179b02ed4d1a0a7f143
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a240bc5c43130c6aa50831d7caaa02a1d84e1bce
Impacted products
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show()\n\nWear-leveling entry could be freed in error path, which may be accessed\nagain in eraseblk_count_seq_show(), for example:\n\n__erase_worker                eraseblk_count_seq_show\n                                wl = ubi-\u003elookuptbl[*block_number]\n\t\t\t\tif (wl)\n  wl_entry_destroy\n    ubi-\u003elookuptbl[e-\u003epnum] = NULL\n    kmem_cache_free(ubi_wl_entry_slab, e)\n\t\t                   erase_count = wl-\u003eec  // UAF!\n\nWear-leveling entry updating/accessing in ubi-\u003elookuptbl should be\nprotected by ubi-\u003ewl_lock, fix it by adding ubi-\u003ewl_lock to serialize\nwl entry accessing between wl_entry_destroy() and\neraseblk_count_seq_show().\n\nFetch a reproducer in [Link]."
    }
  ],
  "id": "CVE-2023-53826",
  "lastModified": "2025-12-09T18:37:13.640",
  "metrics": {},
  "published": "2025-12-09T16:17:21.457",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1cb14c06d6035539ef4215c4ba0871aea71d7c38"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3f9b63dfce44a7c3c095dd93d910408e07ab1845"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/79548ccdd992707879b4b683b7251c58ddf26f12"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/84250da1c63cb7d421a3b4812b5c2ce2e47d31a1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/84253f3c2dad6be10d30c92626c763d9a9f512ad"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9d448dd6bcb61a508204b57ea1f454ba9bac2f24"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a100de2974d208cfca032179b02ed4d1a0a7f143"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a240bc5c43130c6aa50831d7caaa02a1d84e1bce"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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