github - ghsa-gc3v-ppv7-rpm9

GHSA-GC3V-PPV7-RPM9

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:

btrfs: zoned: fix use-after-free due to race with dev replace

While loading a zone's info during creation of a block group, we can race with a device replace operation and then trigger a use-after-free on the device that was just replaced (source device of the replace operation).

This happens because at btrfs_load_zone_info() we extract a device from the chunk map into a local variable and then use the device while not under the protection of the device replace rwsem. So if there's a device replace operation happening when we extract the device and that device is the source of the replace operation, we will trigger a use-after-free if before we finish using the device the replace operation finishes and frees the device.

Fix this by enlarging the critical section under the protection of the device replace rwsem so that all uses of the device are done inside the critical section.

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-2024-39496"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-12T13:15:12Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: zoned: fix use-after-free due to race with dev replace\n\nWhile loading a zone\u0027s info during creation of a block group, we can race\nwith a device replace operation and then trigger a use-after-free on the\ndevice that was just replaced (source device of the replace operation).\n\nThis happens because at btrfs_load_zone_info() we extract a device from\nthe chunk map into a local variable and then use the device while not\nunder the protection of the device replace rwsem. So if there\u0027s a device\nreplace operation happening when we extract the device and that device\nis the source of the replace operation, we will trigger a use-after-free\nif before we finish using the device the replace operation finishes and\nfrees the device.\n\nFix this by enlarging the critical section under the protection of the\ndevice replace rwsem so that all uses of the device are done inside the\ncritical section.",
  "id": "GHSA-gc3v-ppv7-rpm9",
  "modified": "2025-11-04T00:30:51Z",
  "published": "2024-07-12T15:31:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-39496"
    },
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      "url": "https://git.kernel.org/stable/c/17765964703b88d8befd899f8501150bb7e07e43"
    },
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}

CVE-2024-39496 (GCVE-0-2024-39496)

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

Summary

In the Linux kernel, the following vulnerability has been resolved: btrfs: zoned: fix use-after-free due to race with dev replace While loading a zone's info during creation of a block group, we can race with a device replace operation and then trigger a use-after-free on the device that was just replaced (source device of the replace operation). This happens because at btrfs_load_zone_info() we extract a device from the chunk map into a local variable and then use the device while not under the protection of the device replace rwsem. So if there's a device replace operation happening when we extract the device and that device is the source of the replace operation, we will trigger a use-after-free if before we finish using the device the replace operation finishes and frees the device. Fix this by enlarging the critical section under the protection of the device replace rwsem so that all uses of the device are done inside the critical section.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/17765964703b88d8b…
	https://git.kernel.org/stable/c/092571ef9a812566c…
	https://git.kernel.org/stable/c/a0cc006f4214b87e7…
	https://git.kernel.org/stable/c/0090d6e1b210551e6…

Impacted products

Vendor

Product

Version

Linux

Affected: 5b316468983dfa9473ff0f1c42e4e30b4c267141 , < 17765964703b88d8befd899f8501150bb7e07e43 (git)
Affected: 5b316468983dfa9473ff0f1c42e4e30b4c267141 , < 092571ef9a812566c8f2c9038d9c2a64c49788d6 (git)
Affected: 5b316468983dfa9473ff0f1c42e4e30b4c267141 , < a0cc006f4214b87e70983c692e05bb36c59b5752 (git)
Affected: 5b316468983dfa9473ff0f1c42e4e30b4c267141 , < 0090d6e1b210551e63cf43958dc7a1ec942cdde9 (git)

Linux

Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 6.1.95 , ≤ 6.1.* (semver)
Unaffected: 6.6.35 , ≤ 6.6.* (semver)
Unaffected: 6.9.6 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)

Show details on NVD website

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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-GC3V-PPV7-RPM9

CVE-2024-39496 (GCVE-0-2024-39496)

Tags

Sightings

Nomenclature