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CVE-2026-53388 (GCVE-0-2026-53388)

Vulnerability from cvelistv5 – Published: 2026-07-19 11:59 – Updated: 2026-08-17 04:50
VLAI
Title
fuse: re-lock request before replacing page cache folio
Summary
In the Linux kernel, the following vulnerability has been resolved: fuse: re-lock request before replacing page cache folio fuse_try_move_folio() unlocks the request on entry but does not re-lock it on the success path. This means fuse_chan_abort() can end the request and free the fuse_io_args (eg fuse_readpages_end()) while the subsequent copy chain logic after fuse_try_move_folio() accesses the fuse_io_args, leading to use-after-free issues. Fix this by calling lock_request() before replace_page_cache_folio(). This ensures the request is locked on the success path which will prevent the fuse_io_args from being freed while the later copying logic runs, and also ensures that the ap->folios[i]->mapping is never null since ap->folios[i] will always point to the newfolio after replace_page_cache_folio().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ce534fb052928ce556639d7ecf01cbf4e01321e1 , < 7c18691e0cfda29672f79bafde8abdb7710674f6 (git)
Affected: ce534fb052928ce556639d7ecf01cbf4e01321e1 , < 5927b43a4f8d89e86930f524bf63e9c7e66f61b4 (git)
Affected: ce534fb052928ce556639d7ecf01cbf4e01321e1 , < 030fe3e9d8abdee303dd7e9e42f45082d382a407 (git)
Affected: ce534fb052928ce556639d7ecf01cbf4e01321e1 , < 46473ddccdc5065033e397d6e62c280dbcd3d9c2 (git)
Affected: ce534fb052928ce556639d7ecf01cbf4e01321e1 , < af2892249d982a1c036ca456cc135374e68b6677 (git)
Affected: ce534fb052928ce556639d7ecf01cbf4e01321e1 , < 0223f452532d9cd8a5e87c45de828fd93c99bd25 (git)
Affected: ce534fb052928ce556639d7ecf01cbf4e01321e1 , < e28db6ac4792d065ab32565fd9f0a2361c3d4666 (git)
Affected: ce534fb052928ce556639d7ecf01cbf4e01321e1 , < a078484921052d0badd827fcc2770b5cfc1d4120 (git)
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Linux Linux Affected: 2.6.35
Unaffected: 0 , < 2.6.35 (semver)
Unaffected: 5.15.211 , ≤ 5.15.* (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.37 , ≤ 6.18.* (semver)
Unaffected: 7.0.14 , ≤ 7.0.* (semver)
Unaffected: 7.1.2 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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This means fuse_chan_abort() can end the\\nrequest and free the fuse_io_args (eg fuse_readpages_end()) while the\\nsubsequent copy chain logic after fuse_try_move_folio() accesses the\\nfuse_io_args, leading to use-after-free issues.\\n\\nFix this by calling lock_request() before replace_page_cache_folio().\\nThis ensures the request is locked on the success path which will\\nprevent the fuse_io_args from being freed while the later copying logic\\nruns, and also ensures that the ap-\u003efolios[i]-\u003emapping is never null\\nsince ap-\u003efolios[i] will always point to the newfolio 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-20T17:09:28+00:00",
      "cve": "CVE-2026-53388",
      "id": "CVE-2026-53388",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "274",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fuse: re-lock request before replacing page cache folio",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53388.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-16T00:10:44Z",
      "cve": "CVE-2026-53388",
      "id": "CVE-2026-53388",
      "initial_release_date": "2026-07-19T17:36:09Z",
      "product_status:first_fixed": "194",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "147",
      "product_status:recommended": "471",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53388",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53388.json",
      "version": "18"
    }
  }
}



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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.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.