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CVE-2026-74542 (GCVE-0-2026-74542)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-17 05:21
VLAI
Title
netfs: Fix folio_queue ENOMEM in writeback by adding a mempool
Summary
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix folio_queue ENOMEM in writeback by adding a mempool Fix the handling of folio_queue allocation failure in writeback by adding a mempool and passing in gfp_t flags to the rolling buffer functions that allocate memory, using the mempool if gfp != GFP_KERNEL. This is then extended upwards and the gfp to be used for a request is stored in the netfs_io_request struct and is then used for both requests and subrequests, eliminating the sleeping loops there. The failure caused: folio != NULL WARNING: fs/netfs/write_issue.c:603 at netfs_writepages+0x883/0xa10 fs/netfs/write_issue.c:603, CPU#3: syz.0.17/5919
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cd0277ed0c188dd40e7744e89299af7b78831ca4 , < 3f6d7f8a5416d852648d15a05e895f1195ee8a85 (git)
Affected: cd0277ed0c188dd40e7744e89299af7b78831ca4 , < 1d78d56c43ef3768183e8370e7367b162700e049 (git)
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Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "fs/netfs/buffered_read.c",
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            "fs/netfs/rolling_buffer.c",
            "fs/netfs/write_issue.c",
            "include/linux/netfs.h",
            "include/linux/rolling_buffer.h"
          ],
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              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix folio_queue ENOMEM in writeback by adding a mempool\n\nFix the handling of folio_queue allocation failure in writeback by adding a\nmempool and passing in gfp_t flags to the rolling buffer functions that\nallocate memory, using the mempool if gfp != GFP_KERNEL.\n\nThis is then extended upwards and the gfp to be used for a request is stored\nin the netfs_io_request struct and is then used for both requests and\nsubrequests, eliminating the sleeping loops there.\n\nThe failure caused:\n\n    folio != NULL\n    WARNING: fs/netfs/write_issue.c:603 at netfs_writepages+0x883/0xa10 fs/netfs/write_issue.c:603, CPU#3: syz.0.17/5919"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:21:27.220Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/1d78d56c43ef3768183e8370e7367b162700e049"
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      "title": "netfs: Fix folio_queue ENOMEM in writeback by adding a mempool",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74542",
    "datePublished": "2026-08-15T12:27:52.741Z",
    "dateReserved": "2026-08-15T05:44:03.914Z",
    "dateUpdated": "2026-08-17T05:21:27.220Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-01T10:37:41+00:00",
      "cve": "CVE-2026-74542",
      "id": "CVE-2026-74542",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfs: Fix folio_queue ENOMEM in writeback by adding a mempool",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74542.json",
      "version": "3"
    }
  }
}



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