CVE-2023-53826 (GCVE-0-2023-53826)

Vulnerability from cvelistv5 – Published: 2025-12-09 01:29 – Updated: 2025-12-09 01:29
VLAI?
Title
ubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show()
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].
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 801c135ce73d5df1caf3eca35b66a10824ae0707 , < 3f9b63dfce44a7c3c095dd93d910408e07ab1845 (git)
Affected: 801c135ce73d5df1caf3eca35b66a10824ae0707 , < 84250da1c63cb7d421a3b4812b5c2ce2e47d31a1 (git)
Affected: 801c135ce73d5df1caf3eca35b66a10824ae0707 , < 1cb14c06d6035539ef4215c4ba0871aea71d7c38 (git)
Affected: 801c135ce73d5df1caf3eca35b66a10824ae0707 , < 9d448dd6bcb61a508204b57ea1f454ba9bac2f24 (git)
Affected: 801c135ce73d5df1caf3eca35b66a10824ae0707 , < 79548ccdd992707879b4b683b7251c58ddf26f12 (git)
Affected: 801c135ce73d5df1caf3eca35b66a10824ae0707 , < 84253f3c2dad6be10d30c92626c763d9a9f512ad (git)
Affected: 801c135ce73d5df1caf3eca35b66a10824ae0707 , < a100de2974d208cfca032179b02ed4d1a0a7f143 (git)
Affected: 801c135ce73d5df1caf3eca35b66a10824ae0707 , < a240bc5c43130c6aa50831d7caaa02a1d84e1bce (git)
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    Linux Linux Affected: 2.6.22
Unaffected: 0 , < 2.6.22 (semver)
Unaffected: 4.14.308 , ≤ 4.14.* (semver)
Unaffected: 4.19.276 , ≤ 4.19.* (semver)
Unaffected: 5.4.235 , ≤ 5.4.* (semver)
Unaffected: 5.10.173 , ≤ 5.10.* (semver)
Unaffected: 5.15.100 , ≤ 5.15.* (semver)
Unaffected: 6.1.18 , ≤ 6.1.* (semver)
Unaffected: 6.2.5 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/mtd/ubi/wl.c"
          ],
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "2.6.22"
            },
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              "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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]."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-09T01:29:39.679Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3f9b63dfce44a7c3c095dd93d910408e07ab1845"
        },
        {
          "url": "https://git.kernel.org/stable/c/84250da1c63cb7d421a3b4812b5c2ce2e47d31a1"
        },
        {
          "url": "https://git.kernel.org/stable/c/1cb14c06d6035539ef4215c4ba0871aea71d7c38"
        },
        {
          "url": "https://git.kernel.org/stable/c/9d448dd6bcb61a508204b57ea1f454ba9bac2f24"
        },
        {
          "url": "https://git.kernel.org/stable/c/79548ccdd992707879b4b683b7251c58ddf26f12"
        },
        {
          "url": "https://git.kernel.org/stable/c/84253f3c2dad6be10d30c92626c763d9a9f512ad"
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        {
          "url": "https://git.kernel.org/stable/c/a100de2974d208cfca032179b02ed4d1a0a7f143"
        },
        {
          "url": "https://git.kernel.org/stable/c/a240bc5c43130c6aa50831d7caaa02a1d84e1bce"
        }
      ],
      "title": "ubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53826",
    "datePublished": "2025-12-09T01:29:39.679Z",
    "dateReserved": "2025-12-09T01:27:17.824Z",
    "dateUpdated": "2025-12-09T01:29:39.679Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53826\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-09T16:17:21.457\",\"lastModified\":\"2025-12-09T18:37:13.640\",\"vulnStatus\":\"Awaiting Analysis\",\"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].\"}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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