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CVE-2023-54317 (GCVE-0-2023-54317)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:23 – Updated: 2026-08-05 09:19
VLAI
Title
dm flakey: don't corrupt the zero page
Summary
In the Linux kernel, the following vulnerability has been resolved: dm flakey: don't corrupt the zero page When we need to zero some range on a block device, the function __blkdev_issue_zero_pages submits a write bio with the bio vector pointing to the zero page. If we use dm-flakey with corrupt bio writes option, it will corrupt the content of the zero page which results in crashes of various userspace programs. Glibc assumes that memory returned by mmap is zeroed and it uses it for calloc implementation; if the newly mapped memory is not zeroed, calloc will return non-zeroed memory. Fix this bug by testing if the page is equal to ZERO_PAGE(0) and avoiding the corruption in this case.
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: c6cd92fcabd6cc78bb1808c6a18245c842722fc1 , < b7f8892f672222dbfcc721f51edc03963212b249 (git)
Affected: d4c637af2e56ee1ec66ee34d0ac5a13c75911aec , < 98e311be44dbe31ad9c42aa067b2359bac451fda (git)
Affected: a00f5276e26636cbf72f24f79831026d2e2868e7 , < 3c4a56ef7c538d16c1738ba0ccea9e7146105b5a (git)
Affected: a00f5276e26636cbf72f24f79831026d2e2868e7 , < f2b478228bfdd11e358c5bc197561331f5d5c394 (git)
Affected: a00f5276e26636cbf72f24f79831026d2e2868e7 , < ff60b2bb680ebcaf8890814dd51084a022891469 (git)
Affected: a00f5276e26636cbf72f24f79831026d2e2868e7 , < be360c83f2d810493c04f999d69ec9152981e0c0 (git)
Affected: a00f5276e26636cbf72f24f79831026d2e2868e7 , < 63d31617883d64b43b0e2d529f0751f40713ecae (git)
Affected: a00f5276e26636cbf72f24f79831026d2e2868e7 , < f50714b57aecb6b3dc81d578e295f86d9c73f078 (git)
Affected: 1ed7c9f45fb893877ffa7cedd7aa61beaadbb328 (git)
Affected: 4.14.158 , < 4.14.308 (semver)
Affected: 4.19.88 , < 4.19.276 (semver)
Affected: 4.9.206 , < 4.10 (semver)
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Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 4.14.308 , ≤ 4.14.* (semver)
Unaffected: 4.19.276 , ≤ 4.19.* (semver)
Unaffected: 5.4.235 , ≤ 5.4.* (semver)
Unaffected: 5.10.173 , ≤ 5.10.* (semver)
Unaffected: 5.15.99 , ≤ 5.15.* (semver)
Unaffected: 6.1.16 , ≤ 6.1.* (semver)
Unaffected: 6.2.3 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm flakey: don\u0027t corrupt the zero page\n\nWhen we need to zero some range on a block device, the function\n__blkdev_issue_zero_pages submits a write bio with the bio vector pointing\nto the zero page. If we use dm-flakey with corrupt bio writes option, it\nwill corrupt the content of the zero page which results in crashes of\nvarious userspace programs. Glibc assumes that memory returned by mmap is\nzeroed and it uses it for calloc implementation; if the newly mapped\nmemory is not zeroed, calloc will return non-zeroed memory.\n\nFix this bug by testing if the page is equal to ZERO_PAGE(0) and\navoiding the corruption in this case."
        }
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        {
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            "version": "3.1"
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              "value": "AV:L - The corruption is triggered by local block-device I/O \u2014 a write/fallocate/BLKZEROOUT that reaches `__blkdev_issue_zero_pages()` through a dm-flakey device \u2014 with no network protocol involved. This matches the AV:L treatment of all other device-mapper/block-layer CVEs.\nAC:L - Given a flakey target configured with `corrupt_bio_byte ... w`, the write into ZERO_PAGE is fully deterministic: no race, no memory-layout dependency, and the attacker freely repeats I/O until the periodic down interval, which is observable and cycles on a fixed schedule.\nPR:L - While loading the dm table needs CAP_SYS_ADMIN, that is a pre-existing environmental configuration; the exploit step is ordinary filesystem I/O (fallocate/ZERO_RANGE, unwritten-extent zeroing) that any unprivileged user \u2014 or a container process on a flakey-backed volume \u2014 can issue, thereby corrupting memory shared with root processes.\nUI:N - The attacker\u0027s own I/O request drives the whole path; no victim action is needed, and the corrupted zero page then damages other processes passively as they fault in anonymous memory.\nS:U - The corruption stays within the kernel\u0027s own security authority; there is no hypervisor, IOMMU, or DMA boundary crossed, so standard kernel scoring applies.\nC:H - The bug destroys the system-wide guarantee that freshly mapped anonymous memory is zero, at an attacker-selected offset and value, so `calloc`-based buffers in every process (including privileged daemons) silently lose their zero terminators/sentinels and can be leveraged to read and disclose adjacent heap contents.\nI:H - An arbitrary byte value is written at an arbitrary offset into a page shared read-only by every process on the system, and because the same global page is the source for all subsequent `blkdev_issue_zeroout` fallbacks, non-zero garbage is also persisted to disk on unrelated, healthy block devices.\nA:H - The commit documents that the corrupted zero page causes crashes of various userspace programs via glibc\u0027s `calloc`, and the damage is permanent for the boot, producing system-wide instability across all users and services."
            }
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        "dateUpdated": "2026-08-05T09:19:12.880Z",
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        "shortName": "Linux"
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      "title": "dm flakey: don\u0027t corrupt the zero page",
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    "datePublished": "2025-12-30T12:23:47.232Z",
    "dateReserved": "2025-12-30T12:06:44.531Z",
    "dateUpdated": "2026-08-05T09:19:12.880Z",
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      "date": "2026-09-18",
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm flakey: don\u0027t corrupt the zero page\n\nWhen we need to zero some range on a block device, the function\n__blkdev_issue_zero_pages submits a write bio with the bio vector pointing\nto the zero page. If we use dm-flakey with corrupt bio writes option, it\nwill corrupt the content of the zero page which results in crashes of\nvarious userspace programs. Glibc assumes that memory returned by mmap is\nzeroed and it uses it for calloc implementation; if the newly mapped\nmemory is not zeroed, calloc will return non-zeroed memory.\n\nFix this bug by testing if the page is equal to ZERO_PAGE(0) and\navoiding the corruption in this case."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndm flakey: no corromper la p\u00e1gina cero\n\nCuando necesitamos poner a cero un rango en un dispositivo de bloques, la funci\u00f3n __blkdev_issue_zero_pages env\u00eda un bio de escritura con el vector bio apuntando a la p\u00e1gina cero. Si usamos dm-flakey con la opci\u00f3n de escrituras bio corruptas, corromper\u00e1 el contenido de la p\u00e1gina cero, lo que resulta en fallos de varios programas de espacio de usuario. Glibc asume que la memoria devuelta por mmap est\u00e1 puesta a cero y la usa para la implementaci\u00f3n de calloc; si la memoria reci\u00e9n mapeada no est\u00e1 puesta a cero, calloc devolver\u00e1 memoria no puesta a cero.\n\nSoluciona este error probando si la p\u00e1gina es igual a ZERO_PAGE(0) y evitando la corrupci\u00f3n en este caso."
          }
        ],
        "id": "CVE-2023-54317",
        "lastModified": "2026-08-04T11:16:40.117",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2025-12-30T13:16:20.973",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3c4a56ef7c538d16c1738ba0ccea9e7146105b5a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/63d31617883d64b43b0e2d529f0751f40713ecae"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/98e311be44dbe31ad9c42aa067b2359bac451fda"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b7f8892f672222dbfcc721f51edc03963212b249"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/be360c83f2d810493c04f999d69ec9152981e0c0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f2b478228bfdd11e358c5bc197561331f5d5c394"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f50714b57aecb6b3dc81d578e295f86d9c73f078"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ff60b2bb680ebcaf8890814dd51084a022891469"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:12:45+00:00",
      "cve": "CVE-2023-54317",
      "id": "CVE-2023-54317",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "120",
      "product_status:known_affected": "122",
      "product_status:known_not_affected": "120",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dm flakey: don\u0027t corrupt the zero page",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54317.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T00:52:18Z",
      "cve": "CVE-2023-54317",
      "id": "CVE-2023-54317",
      "initial_release_date": "2025-12-31T00:25:57Z",
      "product_status:known_affected": "427",
      "product_status:known_not_affected": "255",
      "product_status:recommended": "268",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-54317",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-54317.json",
      "version": "25"
    }
  }
}



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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.