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CVE-2025-21671 (GCVE-0-2025-21671)

Vulnerability from cvelistv5 – Published: 2025-01-31 11:25 – Updated: 2026-05-11 21:04
VLAI
Title
zram: fix potential UAF of zram table
Summary
In the Linux kernel, the following vulnerability has been resolved: zram: fix potential UAF of zram table If zram_meta_alloc failed early, it frees allocated zram->table without setting it NULL. Which will potentially cause zram_meta_free to access the table if user reset an failed and uninitialized device.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-10 17:11 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ac3b5366b9b7c9d97b606532ceab43d2329a22f3 , < fe3de867f94819ba0f28e035c0b0182150147d95 (git)
Affected: 0b5b0b65561b34e6e360de317e4bcd031bfabf42 , < 571d3f6045cd3a6d9f6aec33b678f3ffe97582ef (git)
Affected: 6fb92e9a52e3feae309a213950f21dfcd1eb0b40 , < 902ef8f16d5ca77edc77c30656be54186c1e99b7 (git)
Affected: 74363ec674cb172d8856de25776c8f3103f05e2f , < 212fe1c0df4a150fb6298db2cfff267ceaba5402 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.1.122 , < 6.1.127 (semver)
Affected: 6.6.68 , < 6.6.74 (semver)
Affected: 6.12.7 , < 6.12.11 (semver)
guessed Create a notification for this product.
Show details on NVD website
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            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nzram: fix potential UAF of zram table\n\nIf zram_meta_alloc failed early, it frees allocated zram-\u003etable without\nsetting it NULL.  Which will potentially cause zram_meta_free to access\nthe table if user reset an failed and uninitialized device."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-01-31T11:25:34.546Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/fe3de867f94819ba0f28e035c0b0182150147d95"
            },
            {
              "url": "https://git.kernel.org/stable/c/571d3f6045cd3a6d9f6aec33b678f3ffe97582ef"
            },
            {
              "url": "https://git.kernel.org/stable/c/902ef8f16d5ca77edc77c30656be54186c1e99b7"
            },
            {
              "url": "https://git.kernel.org/stable/c/212fe1c0df4a150fb6298db2cfff267ceaba5402"
            }
          ],
          "title": "zram: fix potential UAF of zram table",
          "x_generator": {
            "engine": "bippy-5f407fcff5a0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-21671",
        "datePublished": "2025-01-31T11:25:34.546Z",
        "dateReserved": "2024-12-29T08:45:45.735Z",
        "dateUpdated": "2025-02-10T17:21:05.639Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.