Vulnerability-Lookup

GHSA-HC4X-FM75-Q3WC

Vulnerability from github – Published: 2024-07-12 15:31 – Updated: 2025-11-04 00:30

Details

In the Linux kernel, the following vulnerability has been resolved:

drm/shmem-helper: Fix BUG_ON() on mmap(PROT_WRITE, MAP_PRIVATE)

Lack of check for copy-on-write (COW) mapping in drm_gem_shmem_mmap allows users to call mmap with PROT_WRITE and MAP_PRIVATE flag causing a kernel panic due to BUG_ON in vmf_insert_pfn_prot: BUG_ON((vma->vm_flags & VM_PFNMAP) && is_cow_mapping(vma->vm_flags));

Return -EINVAL early if COW mapping is detected.

This bug affects all drm drivers using default shmem helpers. It can be reproduced by this simple example: void *ptr = mmap(0, size, PROT_WRITE, MAP_PRIVATE, fd, mmap_offset); ptr[0] = 0;

Severity ?

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2024-39497"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-617"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-12T13:15:12Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/shmem-helper: Fix BUG_ON() on mmap(PROT_WRITE, MAP_PRIVATE)\n\nLack of check for copy-on-write (COW) mapping in drm_gem_shmem_mmap\nallows users to call mmap with PROT_WRITE and MAP_PRIVATE flag\ncausing a kernel panic due to BUG_ON in vmf_insert_pfn_prot:\nBUG_ON((vma-\u003evm_flags \u0026 VM_PFNMAP) \u0026\u0026 is_cow_mapping(vma-\u003evm_flags));\n\nReturn -EINVAL early if COW mapping is detected.\n\nThis bug affects all drm drivers using default shmem helpers.\nIt can be reproduced by this simple example:\nvoid *ptr = mmap(0, size, PROT_WRITE, MAP_PRIVATE, fd, mmap_offset);\nptr[0] = 0;",
  "id": "GHSA-hc4x-fm75-q3wc",
  "modified": "2025-11-04T00:30:51Z",
  "published": "2024-07-12T15:31:26Z",
  "references": [
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      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-39497"
    },
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      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-39497 (GCVE-0-2024-39497)

Vulnerability from cvelistv5 – Published: 2024-07-12 12:20 – Updated: 2025-11-03 21:56

Title

drm/shmem-helper: Fix BUG_ON() on mmap(PROT_WRITE, MAP_PRIVATE)

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/shmem-helper: Fix BUG_ON() on mmap(PROT_WRITE, MAP_PRIVATE) Lack of check for copy-on-write (COW) mapping in drm_gem_shmem_mmap allows users to call mmap with PROT_WRITE and MAP_PRIVATE flag causing a kernel panic due to BUG_ON in vmf_insert_pfn_prot: BUG_ON((vma->vm_flags & VM_PFNMAP) && is_cow_mapping(vma->vm_flags)); Return -EINVAL early if COW mapping is detected. This bug affects all drm drivers using default shmem helpers. It can be reproduced by this simple example: void *ptr = mmap(0, size, PROT_WRITE, MAP_PRIVATE, fd, mmap_offset); ptr[0] = 0;

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/a508a102edf8735ad…
	https://git.kernel.org/stable/c/3ae63a8c1685e1695…
	https://git.kernel.org/stable/c/2219e5f97244b79c2…
	https://git.kernel.org/stable/c/1b4a8b89bf6787090…
	https://git.kernel.org/stable/c/03c71c42809ef4b17…
	https://git.kernel.org/stable/c/39bc27bd688066a63…

Impacted products

Vendor

Product

Version

Linux

Affected: 2194a63a818db71065ebe09c8104f5f021ca4e7b , < a508a102edf8735adc9bb73d37dd13c38d1a1b10 (git)
Affected: 2194a63a818db71065ebe09c8104f5f021ca4e7b , < 3ae63a8c1685e16958560ec08d30defdc5b9cca0 (git)
Affected: 2194a63a818db71065ebe09c8104f5f021ca4e7b , < 2219e5f97244b79c276751a1167615b9714db1b0 (git)
Affected: 2194a63a818db71065ebe09c8104f5f021ca4e7b , < 1b4a8b89bf6787090b56424d269bf84ba00c3263 (git)
Affected: 2194a63a818db71065ebe09c8104f5f021ca4e7b , < 03c71c42809ef4b17f5d874cdb2d3bf40e847b86 (git)
Affected: 2194a63a818db71065ebe09c8104f5f021ca4e7b , < 39bc27bd688066a63e56f7f64ad34fae03fbe3b8 (git)

Linux

Affected: 5.2
Unaffected: 0 , < 5.2 (semver)
Unaffected: 5.10.229 , ≤ 5.10.* (semver)
Unaffected: 5.15.169 , ≤ 5.15.* (semver)
Unaffected: 6.1.114 , ≤ 6.1.* (semver)
Unaffected: 6.6.35 , ≤ 6.6.* (semver)
Unaffected: 6.9.6 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)

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JSON

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Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-HC4X-FM75-Q3WC

CVE-2024-39497 (GCVE-0-2024-39497)

Tags

Sightings

Nomenclature