Vulnerability-Lookup

GHSA-5PFC-PQWH-23PX

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-11 21:31

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89719"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:20:00Z",
    "severity": null
  },
  "details": "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": "GHSA-5pfc-pqwh-23px",
  "modified": "2026-09-11T21:31:37Z",
  "published": "2026-09-11T21:31:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89719"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/391f057f44a51cc9418da5cba78b014324174264"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

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.

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)

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{
  "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": [
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              "status": "affected",
              "version": "c0265342bff4fcaa2cdf13f4596244c18d4a7ae5",
              "versionType": "git"
            },
            {
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              "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"
          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.18"
            },
            {
              "lessThan": "4.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
            },
            {
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              "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"
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          "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()",
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        "engine": "bippy-1.2.0"
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    "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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