Vulnerability-Lookup

FKIE_CVE-2026-89719

Vulnerability from fkie_nvd - Published: 2026-09-11 20:20 - Updated: 2026-09-11 20:20

Severity

Summary

In the Linux kernel, the following vulnerability has been resolved: zram: fix out-of-bounds access in read_block_state() read_block_state() calculates nr_pages before taking dev_lock. If the device is reset and reinitialized with a smaller disksize before lock acquisition, nr_pages still describes the old table. The subsequent loop can then call slot_lock() past the end of the newly allocated table. Read disksize after acquiring dev_lock and checking that the device is initialized. The read lock then keeps the table and its bound stable for the duration of the scan.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/391f057f44a51cc9418da5cba78b014324174264
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/block/zram/zram_drv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d",
              "status": "affected",
              "version": "c0265342bff4fcaa2cdf13f4596244c18d4a7ae5",
              "versionType": "git"
            },
            {
              "lessThan": "5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3",
              "status": "affected",
              "version": "c0265342bff4fcaa2cdf13f4596244c18d4a7ae5",
              "versionType": "git"
            },
            {
              "lessThan": "391f057f44a51cc9418da5cba78b014324174264",
              "status": "affected",
              "version": "c0265342bff4fcaa2cdf13f4596244c18d4a7ae5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/block/zram/zram_drv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.18"
            },
            {
              "lessThan": "4.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "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\nzram: fix out-of-bounds access in read_block_state()\n\nread_block_state() calculates nr_pages before taking dev_lock.  If the\ndevice is reset and reinitialized with a smaller disksize before lock\nacquisition, nr_pages still describes the old table.  The subsequent loop\ncan then call slot_lock() past the end of the newly allocated table.\n\nRead disksize after acquiring dev_lock and checking that the device is\ninitialized.  The read lock then keeps the table and its bound stable for\nthe duration of the scan."
    }
  ],
  "id": "CVE-2026-89719",
  "lastModified": "2026-09-11T20:20:00.820",
  "metrics": {},
  "published": "2026-09-11T20:20:00.820",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/391f057f44a51cc9418da5cba78b014324174264"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-89719 (GCVE-0-2026-89719)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-11 19:46

Title

zram: fix out-of-bounds access in read_block_state()

Summary

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/e7dbcb7a561a21e9a…
https://git.kernel.org/stable/c/5e458fa714a55b6b6…
https://git.kernel.org/stable/c/391f057f44a51cc94…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 , < e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d (git) Affected: c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 , < 5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3 (git) Affected: c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 , < 391f057f44a51cc9418da5cba78b014324174264 (git)
Linux	Linux	Affected: 4.18 Unaffected: 0 , < 4.18 (semver) Unaffected: 6.18.51 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/block/zram/zram_drv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d",
              "status": "affected",
              "version": "c0265342bff4fcaa2cdf13f4596244c18d4a7ae5",
              "versionType": "git"
            },
            {
              "lessThan": "5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3",
              "status": "affected",
              "version": "c0265342bff4fcaa2cdf13f4596244c18d4a7ae5",
              "versionType": "git"
            },
            {
              "lessThan": "391f057f44a51cc9418da5cba78b014324174264",
              "status": "affected",
              "version": "c0265342bff4fcaa2cdf13f4596244c18d4a7ae5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/block/zram/zram_drv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.18"
            },
            {
              "lessThan": "4.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nzram: fix out-of-bounds access in read_block_state()\n\nread_block_state() calculates nr_pages before taking dev_lock.  If the\ndevice is reset and reinitialized with a smaller disksize before lock\nacquisition, nr_pages still describes the old table.  The subsequent loop\ncan then call slot_lock() past the end of the newly allocated table.\n\nRead disksize after acquiring dev_lock and checking that the device is\ninitialized.  The read lock then keeps the table and its bound stable for\nthe duration of the scan."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-11T19:46:32.185Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3"
        },
        {
          "url": "https://git.kernel.org/stable/c/391f057f44a51cc9418da5cba78b014324174264"
        }
      ],
      "title": "zram: fix out-of-bounds access in read_block_state()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89719",
    "datePublished": "2026-09-11T19:46:32.185Z",
    "dateReserved": "2026-09-11T19:38:34.752Z",
    "dateUpdated": "2026-09-11T19:46:32.185Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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