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

Type: advisorySources: OSV

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.

Products
Kernel
Affected versions
Not specified
Fixed versions
6.12.94, 6.18.36, 6.6.143, 7.0.13
CVEs
CVE-2026-53185
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 15:03 UTC · Revision 1

Source evidence

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

core-osv · Original source

Published 25 Jun 2026, 08:38 UTC

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.

osv:CVE-2026-53185

Kernel

Fixed versions: 6.6.143, 6.12.94, 6.18.36, 7.0.13

Complete source record
{
  "id": "a8798bafacee8d52246e757d3452beae9b04ab7b1c21559e5225f993fa4fbf02",
  "url": "https://osv.dev/vulnerability/CVE-2026-53185",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "zram: fix use-after-free in zram_bvec_write_partial()",
    "summary": "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.",
    "evidence": "osv:CVE-2026-53185",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.143",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.94",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.36",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.13",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-53185",
      "aliases": [
        "CVE-2026-53185"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
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              "type": "GIT",
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                },
                {
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                },
                {
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                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53185.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "4.14.0"
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                  "fixed": "6.6.143"
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            {
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                  "introduced": "6.7.0"
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            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.36"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.13"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53185.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:36.569419565Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0c2821665ff71be3f4b07ecece384669f2877f6a",
        "https://git.kernel.org/stable/c/198b5a14cca27263b9c14b20114c8092de15dfcb",
        "https://git.kernel.org/stable/c/732fd9f0b9c1cdc6dfd77162ded60df005182cc0",
        "https://git.kernel.org/stable/c/77a602b505ce4802915853cfc435a4722fab3e64",
        "https://git.kernel.org/stable/c/c96786d6ff1acc1d54d9241e97767554c1dfdd5b",
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53185.json",
        "https://access.redhat.com/errata/RHSA-2026:59723",
        "https://access.redhat.com/errata/RHSA-2026:61887",
        "https://access.redhat.com/errata/RHSA-2026:63013",
        "https://access.redhat.com/errata/RHSA-2026:63014",
        "https://access.redhat.com/errata/RHSA-2026:65708",
        "https://access.redhat.com/security/cve/CVE-2026-53185",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53185.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53185",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2492735",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53185.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53185",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 503927,
  "published_at": "2026-06-25T08:38:58.853+00:00"
}