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

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-11 19:46
VLAI
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
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 , < e7dbcb7a561a21e9a8f5b5fa90bb95aefbd0739d (git)
Affected: c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 , < 5e458fa714a55b6b64a9fe0c6d4fa609609f9ec3 (git)
Affected: c0265342bff4fcaa2cdf13f4596244c18d4a7ae5 , < 391f057f44a51cc9418da5cba78b014324174264 (git)
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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": {
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          "product": "Linux",
          "programFiles": [
            "drivers/block/zram/zram_drv.c"
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              "operator": "OR"
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      ],
      "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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        },
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          "url": "https://git.kernel.org/stable/c/391f057f44a51cc9418da5cba78b014324174264"
        }
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      "title": "zram: fix out-of-bounds access in read_block_state()",
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    "datePublished": "2026-09-11T19:46:32.185Z",
    "dateReserved": "2026-09-11T19:38:34.752Z",
    "dateUpdated": "2026-09-11T19:46:32.185Z",
    "state": "PUBLISHED"
  },
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                "programFiles": [
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              }
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        "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",
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      "cve": "CVE-2026-89719",
      "id": "CVE-2026-89719",
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      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: zram out-of-bounds access leading to system instability",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89719.json",
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      "status": "interim",
      "title": "SUSE CVE CVE-2026-89719",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89719.json",
      "version": "3"
    }
  }
}



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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.

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Nomenclature

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • 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.


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