CVE-2023-53172 (GCVE-0-2023-53172)

Vulnerability from cvelistv5 – Published: 2025-09-15 14:04 – Updated: 2026-05-11 19:39
VLAI
Title
fsverity: reject FS_IOC_ENABLE_VERITY on mode 3 fds
Summary
In the Linux kernel, the following vulnerability has been resolved: fsverity: reject FS_IOC_ENABLE_VERITY on mode 3 fds Commit 56124d6c87fd ("fsverity: support enabling with tree block size < PAGE_SIZE") changed FS_IOC_ENABLE_VERITY to use __kernel_read() to read the file's data, instead of direct pagecache accesses. An unintended consequence of this is that the 'WARN_ON_ONCE(!(file->f_mode & FMODE_READ))' in __kernel_read() became reachable by fuzz tests. This happens if FS_IOC_ENABLE_VERITY is called on a fd opened with access mode 3, which means "ioctl access only". Arguably, FS_IOC_ENABLE_VERITY should work on ioctl-only fds. But ioctl-only fds are a weird Linux extension that is rarely used and that few people even know about. (The documentation for FS_IOC_ENABLE_VERITY even specifically says it requires O_RDONLY.) It's probably not worthwhile to make the ioctl internally open a new fd just to handle this case. Thus, just reject the ioctl on such fds for now.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 56124d6c87fd749477425110d2564166621a89c4 , < 85c039cff3c359967cafe90443c02321e950b216 (git)
Affected: 56124d6c87fd749477425110d2564166621a89c4 , < 04839139213cf60d4c5fc792214a08830e294ff8 (git)
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Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.3.1 , ≤ 6.3.* (semver)
Unaffected: 6.4 , ≤ * (original_commit_for_fix)
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    "redhat_vex": {
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      "cve": "CVE-2023-53172",
      "id": "CVE-2023-53172",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fsverity: reject FS_IOC_ENABLE_VERITY on mode 3 fds",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53172.json",
      "version": "3"
    }
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}



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