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GHSA-4PQW-3H25-QRQ3

Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-09-09 15:34
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

zram: fix use-after-free in zram_bvec_write_partial()

zram_read_page() picks the sync or async backing device read path based on whether the parent bio is NULL. zram_bvec_write_partial() passes its parent bio down, so for ZRAM_WB slots the read is dispatched asynchronously and zram_read_page() returns 0 while the bio is still in flight. The caller then runs memcpy_from_bvec(), zram_write_page() and __free_page() on the buffer, leaving the async read to write into a freed page.

zram_bvec_read_partial() was switched to NULL in commit 4e3c87b9421d ("zram: fix synchronous reads") for the same reason; the write_partial counterpart was missed.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-53185"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-364",
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-25T09:16:35Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nzram: fix use-after-free in zram_bvec_write_partial()\n\nzram_read_page() picks the sync or async backing device read path based on\nwhether the parent bio is NULL.  zram_bvec_write_partial() passes its\nparent bio down, so for ZRAM_WB slots the read is dispatched\nasynchronously and zram_read_page() returns 0 while the bio is still in\nflight.  The caller then runs memcpy_from_bvec(), zram_write_page() and\n__free_page() on the buffer, leaving the async read to write into a freed\npage.\n\nzram_bvec_read_partial() was switched to NULL in commit 4e3c87b9421d\n(\"zram: fix synchronous reads\") for the same reason; the write_partial\ncounterpart was missed.",
  "id": "GHSA-4pqw-3h25-qrq3",
  "modified": "2026-09-09T15:34:36Z",
  "published": "2026-06-25T09:31:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53185"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:59723"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:61887"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:63013"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:63014"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:65708"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-53185"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492735"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0c2821665ff71be3f4b07ecece384669f2877f6a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/198b5a14cca27263b9c14b20114c8092de15dfcb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/732fd9f0b9c1cdc6dfd77162ded60df005182cc0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/77a602b505ce4802915853cfc435a4722fab3e64"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c96786d6ff1acc1d54d9241e97767554c1dfdd5b"
    },
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53185.json"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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