Vulnerability-Lookup

GHSA-VQ89-G5M5-675R

Vulnerability from github – Published: 2024-07-05 09:33 – Updated: 2024-07-08 15:31

Details

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

drm/i915/hwmon: Get rid of devm

When both hwmon and hwmon drvdata (on which hwmon depends) are device managed resources, the expectation, on device unbind, is that hwmon will be released before drvdata. However, in i915 there are two separate code paths, which both release either drvdata or hwmon and either can be released before the other. These code paths (for device unbind) are as follows (see also the bug referenced below):

Call Trace: release_nodes+0x11/0x70 devres_release_group+0xb2/0x110 component_unbind_all+0x8d/0xa0 component_del+0xa5/0x140 intel_pxp_tee_component_fini+0x29/0x40 [i915] intel_pxp_fini+0x33/0x80 [i915] i915_driver_remove+0x4c/0x120 [i915] i915_pci_remove+0x19/0x30 [i915] pci_device_remove+0x32/0xa0 device_release_driver_internal+0x19c/0x200 unbind_store+0x9c/0xb0

and

Call Trace: release_nodes+0x11/0x70 devres_release_all+0x8a/0xc0 device_unbind_cleanup+0x9/0x70 device_release_driver_internal+0x1c1/0x200 unbind_store+0x9c/0xb0

This means that in i915, if use devm, we cannot gurantee that hwmon will always be released before drvdata. Which means that we have a uaf if hwmon sysfs is accessed when drvdata has been released but hwmon hasn't.

The only way out of this seems to be do get rid of devm_ and release/free everything explicitly during device unbind.

v2: Change commit message and other minor code changes v3: Cleanup from i915_hwmon_register on error (Armin Wolf) v4: Eliminate potential static analyzer warning (Rodrigo) Eliminate fetch_and_zero (Jani) v5: Restore previous logic for ddat_gt->hwmon_dev error return (Andi)

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2024-39479"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-05T07:15:10Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/hwmon: Get rid of devm\n\nWhen both hwmon and hwmon drvdata (on which hwmon depends) are device\nmanaged resources, the expectation, on device unbind, is that hwmon will be\nreleased before drvdata. However, in i915 there are two separate code\npaths, which both release either drvdata or hwmon and either can be\nreleased before the other. These code paths (for device unbind) are as\nfollows (see also the bug referenced below):\n\nCall Trace:\nrelease_nodes+0x11/0x70\ndevres_release_group+0xb2/0x110\ncomponent_unbind_all+0x8d/0xa0\ncomponent_del+0xa5/0x140\nintel_pxp_tee_component_fini+0x29/0x40 [i915]\nintel_pxp_fini+0x33/0x80 [i915]\ni915_driver_remove+0x4c/0x120 [i915]\ni915_pci_remove+0x19/0x30 [i915]\npci_device_remove+0x32/0xa0\ndevice_release_driver_internal+0x19c/0x200\nunbind_store+0x9c/0xb0\n\nand\n\nCall Trace:\nrelease_nodes+0x11/0x70\ndevres_release_all+0x8a/0xc0\ndevice_unbind_cleanup+0x9/0x70\ndevice_release_driver_internal+0x1c1/0x200\nunbind_store+0x9c/0xb0\n\nThis means that in i915, if use devm, we cannot gurantee that hwmon will\nalways be released before drvdata. Which means that we have a uaf if hwmon\nsysfs is accessed when drvdata has been released but hwmon hasn\u0027t.\n\nThe only way out of this seems to be do get rid of devm_ and release/free\neverything explicitly during device unbind.\n\nv2: Change commit message and other minor code changes\nv3: Cleanup from i915_hwmon_register on error (Armin Wolf)\nv4: Eliminate potential static analyzer warning (Rodrigo)\n    Eliminate fetch_and_zero (Jani)\nv5: Restore previous logic for ddat_gt-\u003ehwmon_dev error return (Andi)",
  "id": "GHSA-vq89-g5m5-675r",
  "modified": "2024-07-08T15:31:55Z",
  "published": "2024-07-05T09:33:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-39479"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5bc9de065b8bb9b8dd8799ecb4592d0403b54281"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ce5a22d22db691d14516c3b8fdbf69139eb2ea8f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cfa73607eb21a4ce1d6294a2c5733628897b48a2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-39479 (GCVE-0-2024-39479)

Vulnerability from cvelistv5 – Published: 2024-07-05 06:55 – Updated: 2026-05-11 20:21

Title

drm/i915/hwmon: Get rid of devm

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/i915/hwmon: Get rid of devm When both hwmon and hwmon drvdata (on which hwmon depends) are device managed resources, the expectation, on device unbind, is that hwmon will be released before drvdata. However, in i915 there are two separate code paths, which both release either drvdata or hwmon and either can be released before the other. These code paths (for device unbind) are as follows (see also the bug referenced below): Call Trace: release_nodes+0x11/0x70 devres_release_group+0xb2/0x110 component_unbind_all+0x8d/0xa0 component_del+0xa5/0x140 intel_pxp_tee_component_fini+0x29/0x40 [i915] intel_pxp_fini+0x33/0x80 [i915] i915_driver_remove+0x4c/0x120 [i915] i915_pci_remove+0x19/0x30 [i915] pci_device_remove+0x32/0xa0 device_release_driver_internal+0x19c/0x200 unbind_store+0x9c/0xb0 and Call Trace: release_nodes+0x11/0x70 devres_release_all+0x8a/0xc0 device_unbind_cleanup+0x9/0x70 device_release_driver_internal+0x1c1/0x200 unbind_store+0x9c/0xb0 This means that in i915, if use devm, we cannot gurantee that hwmon will always be released before drvdata. Which means that we have a uaf if hwmon sysfs is accessed when drvdata has been released but hwmon hasn't. The only way out of this seems to be do get rid of devm_ and release/free everything explicitly during device unbind. v2: Change commit message and other minor code changes v3: Cleanup from i915_hwmon_register on error (Armin Wolf) v4: Eliminate potential static analyzer warning (Rodrigo) Eliminate fetch_and_zero (Jani) v5: Restore previous logic for ddat_gt->hwmon_dev error return (Andi)

Severity

7.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/cfa73607eb21a4ce1…
https://git.kernel.org/stable/c/ce5a22d22db691d14…
https://git.kernel.org/stable/c/5bc9de065b8bb9b8d…

Impacted products

3 products

Vendor	Product	Version
Linux	Linux	Affected: b3b088e28183b84080b7f0a0b8da84ec42b4b0e8 , < cfa73607eb21a4ce1d6294a2c5733628897b48a2 (git) Affected: b3b088e28183b84080b7f0a0b8da84ec42b4b0e8 , < ce5a22d22db691d14516c3b8fdbf69139eb2ea8f (git) Affected: b3b088e28183b84080b7f0a0b8da84ec42b4b0e8 , < 5bc9de065b8bb9b8dd8799ecb4592d0403b54281 (git)
Linux	Linux	Affected: 6.2 Unaffected: 0 , < 6.2 (semver) Unaffected: 6.6.34 , ≤ 6.6.* (semver) Unaffected: 6.9.5 , ≤ 6.9.* (semver) Unaffected: 6.10 , ≤ * (original_commit_for_fix)
linux	linux_kernel	Affected: 1da177e4c3f4 , < cfa73607eb21 (custom) Affected: 1da177e4c3f4 , < ce5a22d22db6 (custom) Affected: 1da177e4c3f4 , < 5bc9de065b8b (custom) Unaffected: 6.6.34 , ≤ 6.7 (custom) Unaffected: 6.95 , ≤ 6.10 (custom) Unaffected: 6.10-rc1 cpe:2.3:o:linux:linux_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.

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GHSA-VQ89-G5M5-675R

CVE-2024-39479 (GCVE-0-2024-39479)

Tags

Sightings

Nomenclature