FKIE_CVE-2023-53826

Vulnerability from fkie_nvd - Published: 2025-12-09 16:17 - Updated: 2026-06-17 06:46
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
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/mtd/ubi/wl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3f9b63dfce44a7c3c095dd93d910408e07ab1845",
              "status": "affected",
              "version": "801c135ce73d5df1caf3eca35b66a10824ae0707",
              "versionType": "git"
            },
            {
              "lessThan": "84250da1c63cb7d421a3b4812b5c2ce2e47d31a1",
              "status": "affected",
              "version": "801c135ce73d5df1caf3eca35b66a10824ae0707",
              "versionType": "git"
            },
            {
              "lessThan": "1cb14c06d6035539ef4215c4ba0871aea71d7c38",
              "status": "affected",
              "version": "801c135ce73d5df1caf3eca35b66a10824ae0707",
              "versionType": "git"
            },
            {
              "lessThan": "9d448dd6bcb61a508204b57ea1f454ba9bac2f24",
              "status": "affected",
              "version": "801c135ce73d5df1caf3eca35b66a10824ae0707",
              "versionType": "git"
            },
            {
              "lessThan": "79548ccdd992707879b4b683b7251c58ddf26f12",
              "status": "affected",
              "version": "801c135ce73d5df1caf3eca35b66a10824ae0707",
              "versionType": "git"
            },
            {
              "lessThan": "84253f3c2dad6be10d30c92626c763d9a9f512ad",
              "status": "affected",
              "version": "801c135ce73d5df1caf3eca35b66a10824ae0707",
              "versionType": "git"
            },
            {
              "lessThan": "a100de2974d208cfca032179b02ed4d1a0a7f143",
              "status": "affected",
              "version": "801c135ce73d5df1caf3eca35b66a10824ae0707",
              "versionType": "git"
            },
            {
              "lessThan": "a240bc5c43130c6aa50831d7caaa02a1d84e1bce",
              "status": "affected",
              "version": "801c135ce73d5df1caf3eca35b66a10824ae0707",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/mtd/ubi/wl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.22"
            },
            {
              "lessThan": "2.6.22",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.308",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.276",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.235",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.173",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.100",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.18",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.2.*",
              "status": "unaffected",
              "version": "6.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.3",
              "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\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": "2026-06-17T06:46:08.393",
  "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": "Deferred"
}


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