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

Vulnerability from cvelistv5 – Published: 2025-12-09 01:29 – Updated: 2026-05-11 19:52
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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          "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": "2026-05-11T19:52:16.903Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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      "title": "ubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53826",
    "datePublished": "2025-12-09T01:29:39.679Z",
    "dateReserved": "2025-12-09T01:27:17.824Z",
    "dateUpdated": "2026-05-11T19:52:16.903Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-07-20",
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adding ubi-\u003ewl_lock to serialize\\nwl entry accessing between wl_entry_destroy() and\\neraseblk_count_seq_show().\\n\\nFetch a reproducer in [Link].\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/mtd/ubi/wl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"801c135ce73d5df1caf3eca35b66a10824ae0707\",\"lessThan\":\"3f9b63dfce44a7c3c095dd93d910408e07ab1845\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"801c135ce73d5df1caf3eca35b66a10824ae0707\",\"lessThan\":\"84250da1c63cb7d421a3b4812b5c2ce2e47d31a1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"801c135ce73d5df1caf3eca35b66a10824ae0707\",\"lessThan\":\"1cb14c06d6035539ef4215c4ba0871aea71d7c38\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"801c135ce73d5df1caf3eca35b66a10824ae0707\",\"lessThan\":\"9d448dd6bcb61a508204b57ea1f454ba9bac2f24\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"801c135ce73d5df1caf3eca35b66a10824ae0707\",\"lessThan\":\"79548ccdd992707879b4b683b7251c58ddf26f12\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"801c135ce73d5df1caf3eca35b66a10824ae0707\",\"lessThan\":\"84253f3c2dad6be10d30c92626c763d9a9f512ad\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"801c135ce73d5df1caf3eca35b66a10824ae0707\",\"lessThan\":\"a100de2974d208cfca032179b02ed4d1a0a7f143\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"801c135ce73d5df1caf3eca35b66a10824ae0707\",\"lessThan\":\"a240bc5c43130c6aa50831d7caaa02a1d84e1bce\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/mtd/ubi/wl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.22\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.22\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.308\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.276\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.235\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.173\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.100\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.18\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.2.5\",\"lessThanOrEqual\":\"6.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"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\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:22:20+00:00",
      "cve": "CVE-2023-53826",
      "id": "CVE-2023-53826",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53826.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-05-22T02:26:04Z",
      "cve": "CVE-2023-53826",
      "id": "CVE-2023-53826",
      "initial_release_date": "2025-12-10T00:35:20Z",
      "product_status:known_not_affected": "378",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53826",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53826.json",
      "version": "17"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.