gfs2: Prevent recursive memory reclaim

{
  "id": "a8a4102b62711618e22bff0e05137276f605b3f81666714eda9db12e5a0a0d19",
  "url": "https://osv.dev/vulnerability/CVE-2025-68356",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "gfs2: Prevent recursive memory reclaim",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: gfs2: Prevent recursive memory reclaim Function new_inode() returns a new inode with inode->i_mapping->gfp_mask set to GFP_HIGHUSER_MOVABLE. This value includes the __GFP_FS flag, so allocations in that address space can recurse into filesystem memory reclaim. We don't want that to happen because it can consume a significant amount of stack memory. Worse than that is that it can also deadlock: for example, in several places, gfs2_unstuff_dinode() is called inside filesystem transactions. This calls filemap_grab_folio(), which can allocate a new folio, which can trigger memory reclaim. If memory reclaim recurses into the filesystem and starts another transaction, a deadlock will ensue. To fix these kinds of problems, prevent memory reclaim from recursing into filesystem code by making sure that the gfp_mask of inode address spaces doesn't include __GFP_FS. The \"meta\" and resource group address spaces were already using GFP_NOFS as their gfp_mask (which doesn't include __GFP_FS). The default value of GFP_HIGHUSER_MOVABLE is less restrictive than GFP_NOFS, though. To avoid being overly limiting, use the default value and only knock off the __GFP_FS flag. I'm not sure if this will actually make a difference, but it also shouldn't hurt. This patch is loosely based on commit ad22c7a043c2 (\"xfs: prevent stack overflows from page cache allocation\"). Fixes xfstest generic/273.",
    "evidence": "osv:CVE-2025-68356",
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    "severity": "unknown",
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      "id": "CVE-2025-68356",
      "aliases": [
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:52.304869859Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2c5f4a53476e3cab70adc77b38942c066bd2c17c",
        "https://git.kernel.org/stable/c/49e7347f4644d031306d56cb4d51e467cbdcbc69",
        "https://git.kernel.org/stable/c/66eb53cecc5f83183535bbfb2fa6464322049b61",
        "https://git.kernel.org/stable/c/9c0960ed112398bdb6c60ccf6e6b583bc59acede",
        "https://git.kernel.org/stable/c/edb2b255618621dc83d0ec23150e16b2c697077f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68356.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-68356",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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    "security_relevant": true,
    "severity_evidence": null
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  "source_id": "core-osv",
  "document_id": 521019,
  "published_at": "2025-12-24T10:32:46.275+00:00"
}