Vulnerability-Lookup

GHSA-F8FR-XVCP-37M8

Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2024-12-26 21:30

Details

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

arch_topology: Avoid use-after-free for scale_freq_data

Currently topology_scale_freq_tick() (which gets called from scheduler_tick()) may end up using a pointer to "struct scale_freq_data", which was previously cleared by topology_clear_scale_freq_source(), as there is no protection in place here. The users of topology_clear_scale_freq_source() though needs a guarantee that the previously cleared scale_freq_data isn't used anymore, so they can free the related resources.

Since topology_scale_freq_tick() is called from scheduler tick, we don't want to add locking in there. Use the RCU update mechanism instead (which is already used by the scheduler's utilization update path) to guarantee race free updates here.

synchronize_rcu() makes sure that all RCU critical sections that started before it is called, will finish before it returns. And so the callers of topology_clear_scale_freq_source() don't need to worry about their callback getting called anymore.

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-2021-47318"
  ],
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      "CWE-416"
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    "nvd_published_at": "2024-05-21T15:15:19Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\narch_topology: Avoid use-after-free for scale_freq_data\n\nCurrently topology_scale_freq_tick() (which gets called from\nscheduler_tick()) may end up using a pointer to \"struct\nscale_freq_data\", which was previously cleared by\ntopology_clear_scale_freq_source(), as there is no protection in place\nhere. The users of topology_clear_scale_freq_source() though needs a\nguarantee that the previously cleared scale_freq_data isn\u0027t used\nanymore, so they can free the related resources.\n\nSince topology_scale_freq_tick() is called from scheduler tick, we don\u0027t\nwant to add locking in there. Use the RCU update mechanism instead\n(which is already used by the scheduler\u0027s utilization update path) to\nguarantee race free updates here.\n\nsynchronize_rcu() makes sure that all RCU critical sections that started\nbefore it is called, will finish before it returns. And so the callers\nof topology_clear_scale_freq_source() don\u0027t need to worry about their\ncallback getting called anymore.",
  "id": "GHSA-f8fr-xvcp-37m8",
  "modified": "2024-12-26T21:30:36Z",
  "published": "2024-05-21T15:31:42Z",
  "references": [
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      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47318"
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      "type": "CVSS_V3"
    }
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}

CVE-2021-47318 (GCVE-0-2021-47318)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2025-05-04 07:08

Title

arch_topology: Avoid use-after-free for scale_freq_data

Summary

In the Linux kernel, the following vulnerability has been resolved: arch_topology: Avoid use-after-free for scale_freq_data Currently topology_scale_freq_tick() (which gets called from scheduler_tick()) may end up using a pointer to "struct scale_freq_data", which was previously cleared by topology_clear_scale_freq_source(), as there is no protection in place here. The users of topology_clear_scale_freq_source() though needs a guarantee that the previously cleared scale_freq_data isn't used anymore, so they can free the related resources. Since topology_scale_freq_tick() is called from scheduler tick, we don't want to add locking in there. Use the RCU update mechanism instead (which is already used by the scheduler's utilization update path) to guarantee race free updates here. synchronize_rcu() makes sure that all RCU critical sections that started before it is called, will finish before it returns. And so the callers of topology_clear_scale_freq_source() don't need to worry about their callback getting called anymore.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/ccdf7e073170886bc…
	https://git.kernel.org/stable/c/83150f5d05f065fb5…

Impacted products

Vendor

Product

Version

Linux

Affected: 01e055c120a46e78650b5f903088badbbdaae9ad , < ccdf7e073170886bc370c613e269de610a794c4a (git)
Affected: 01e055c120a46e78650b5f903088badbbdaae9ad , < 83150f5d05f065fb5c12c612f119015cabdcc124 (git)

Linux

Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.13.4 , ≤ 5.13.* (semver)
Unaffected: 5.14 , ≤ * (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-F8FR-XVCP-37M8

CVE-2021-47318 (GCVE-0-2021-47318)

Tags

Sightings

Nomenclature