Vulnerability-Lookup

GHSA-H7R9-FFQQ-5R47

Vulnerability from github – Published: 2024-10-21 18:30 – Updated: 2026-06-01 18:31

Details

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

fbdev: efifb: Register sysfs groups through driver core

The driver core can register and cleanup sysfs groups already. Make use of that functionality to simplify the error handling and cleanup.

Also avoid a UAF race during unregistering where the sysctl attributes were usable after the info struct was freed.

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-2024-49925"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-10-21T18:15:14Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: efifb: Register sysfs groups through driver core\n\nThe driver core can register and cleanup sysfs groups already.\nMake use of that functionality to simplify the error handling and\ncleanup.\n\nAlso avoid a UAF race during unregistering where the sysctl attributes\nwere usable after the info struct was freed.",
  "id": "GHSA-h7r9-ffqq-5r47",
  "modified": "2026-06-01T18:31:18Z",
  "published": "2024-10-21T18:30:58Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-49925"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a9c40c72097b583b23aeb2a26d429ccfc81fbc1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d97b85eb5a86766ad0f8ea3d121e6ae144e3ed8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/36bfefb6baaa8e46de44f4fd919ce4347337620f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4684d69b9670a83992189f6271dc0fcdec4ed0d7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/872cd2d029d2c970a8a1eea88b48dab2b3f2e93a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/95cdd538e0e5677efbdf8aade04ec098ab98f457"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-49925 (GCVE-0-2024-49925)

Vulnerability from cvelistv5 – Published: 2024-10-21 18:01 – Updated: 2026-08-05 11:40

Title

fbdev: efifb: Register sysfs groups through driver core

Summary

In the Linux kernel, the following vulnerability has been resolved: fbdev: efifb: Register sysfs groups through driver core The driver core can register and cleanup sysfs groups already. Make use of that functionality to simplify the error handling and cleanup. Also avoid a UAF race during unregistering where the sysctl attributes were usable after the info struct was freed.

Severity

7.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-10-22 13:39 UTC

Assigner

Linux mitre root

References

7 references

URL	Tags
https://git.kernel.org/stable/c/2d97b85eb5a86766a…
https://git.kernel.org/stable/c/2a9c40c72097b583b…
https://git.kernel.org/stable/c/36bfefb6baaa8e46d…
https://git.kernel.org/stable/c/872cd2d029d2c970a…
https://git.kernel.org/stable/c/4684d69b9670a8399…
https://git.kernel.org/stable/c/95cdd538e0e5677ef…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 753375a881caa01112b7cec2c796749154e0bb23 , < 2d97b85eb5a86766ad0f8ea3d121e6ae144e3ed8 (git) Affected: 753375a881caa01112b7cec2c796749154e0bb23 , < 2a9c40c72097b583b23aeb2a26d429ccfc81fbc1 (git) Affected: 753375a881caa01112b7cec2c796749154e0bb23 , < 36bfefb6baaa8e46de44f4fd919ce4347337620f (git) Affected: 753375a881caa01112b7cec2c796749154e0bb23 , < 872cd2d029d2c970a8a1eea88b48dab2b3f2e93a (git) Affected: 753375a881caa01112b7cec2c796749154e0bb23 , < 4684d69b9670a83992189f6271dc0fcdec4ed0d7 (git) Affected: 753375a881caa01112b7cec2c796749154e0bb23 , < 95cdd538e0e5677efbdf8aade04ec098ab98f457 (git)
Linux	Linux	Affected: 4.10 Unaffected: 0 , < 4.10 (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.120 , ≤ 6.1.* (semver) Unaffected: 6.6.55 , ≤ 6.6.* (semver) Unaffected: 6.10.14 , ≤ 6.10.* (semver) Unaffected: 6.11.3 , ≤ 6.11.* (semver) Unaffected: 6.12 , ≤ * (original_commit_for_fix)

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JSON

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                "id": "CVE-2024-49925",
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              "value": "AV:L - The vulnerable code is reached only by reading sysfs files under /sys/devices/platform/efi-framebuffer.0/ from a local process; there is no network, adjacent-network, or remote-peer path into efifb\u0027s attribute show handlers.\nAC:L - Exploitation requires the system to be in the narrow state of tearing down the efifb platform driver \u2014 a state only root can induce (driver unbind, or a DRM driver load calling aperture_remove_conflicting_devices()) \u2014 and the window between unregister_framebuffer() and sysfs_remove_groups() is a handful of instructions. The attacker controls only the reader side of the race and cannot trigger, widen, or retry the free.\nPR:L - The attributes are DEVICE_ATTR_RO (mode 0444), so any unprivileged local user, including one inside a container with /sys mounted, can read them in a tight loop with no capability at all.\nUI:N - The driver-removal event that opens the window is an automatic boot-time DRM handoff on typical systems rather than a deliberate victim action, and the attacker\u0027s own read requires no interaction from anyone else.\nS:U - The stale attribute access and the freed struct fb_info both live in the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - A successful read in the window dereferences the freed struct fb_info allocation, and because the read is repeatable and the attacker can spray the slab between attempts to control what lands in the freed slot, it acts as a kernel-heap disclosure oracle rather than a single bounded leak.\nI:N - Every attribute in efifb_groups is DEVICE_ATTR_RO with no store() method, so the code path performs only loads \u2014 there is no out-of-bounds write, no write into the freed object, and no way to alter kernel memory or control flow.\nA:H - Touching the freed fb_info can fault and oops when the backing page has been returned to the allocator or on hardened builds (KASAN/KFENCE/DEBUG_PAGEALLOC), and any such fault in the fbdev teardown path takes down the kernel."
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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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