github - ghsa-33f2-r445-jvq6

GHSA-33F2-R445-JVQ6

Vulnerability from github – Published: 2022-05-24 17:16 – Updated: 2022-05-24 17:16

Details

Overlayfs in the Linux kernel and shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, both replace vma->vm_file in their mmap handlers. On error the original value is not restored, and the reference is put for the file to which vm_file points. On upstream kernels this is not an issue, as no callers dereference vm_file following after call_mmap() returns an error. However, the aufs patchs change mmap_region() to replace the fput() using a local variable with vma_fput(), which will fput() vm_file, leading to a refcount underflow.

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{
  "affected": [],
  "aliases": [
    "CVE-2019-15794"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2020-04-24T00:15:00Z",
    "severity": "HIGH"
  },
  "details": "Overlayfs in the Linux kernel and shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, both replace vma-\u003evm_file in their mmap handlers. On error the original value is not restored, and the reference is put for the file to which vm_file points. On upstream kernels this is not an issue, as no callers dereference vm_file following after call_mmap() returns an error. However, the aufs patchs change mmap_region() to replace the fput() using a local variable with vma_fput(), which will fput() vm_file, leading to a refcount underflow.",
  "id": "GHSA-33f2-r445-jvq6",
  "modified": "2022-05-24T17:16:24Z",
  "published": "2022-05-24T17:16:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-15794"
    },
    {
      "type": "WEB",
      "url": "https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=270d16ae48a4dbf1c7e25e94cc3e38b4bea37635"
    },
    {
      "type": "WEB",
      "url": "https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=ef81780548d20a786cc77ed4203fca146fd81ce3"
    },
    {
      "type": "WEB",
      "url": "https://usn.ubuntu.com/usn/usn-4208-1"
    },
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      "url": "https://usn.ubuntu.com/usn/usn-4209-1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2019-15794 (GCVE-0-2019-15794)

Vulnerability from cvelistv5 – Published: 2020-04-23 23:55 – Updated: 2024-09-16 19:52

Summary

Severity ?

7.1 (High)


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

CWE

CWE-672 - Operation on a Resource after Expiration or Release

Assigner

canonical

References

URL

Tags

	https://git.launchpad.net/~ubuntu-kernel/ubuntu/+…	x_refsource_MISC
	https://git.launchpad.net/~ubuntu-kernel/ubuntu/+…	x_refsource_MISC
	https://usn.ubuntu.com/usn/usn-4208-1	x_refsource_MISC
	https://usn.ubuntu.com/usn/usn-4209-1	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	Ubuntu	Linux kernel	Affected: 5.3 kernel , < 5.3.0-24.26 (custom) Affected: 5.0 kernel , < 5.0.0-37.40 (custom)

Credits

Jann Horn of Google Project Zero

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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-33F2-R445-JVQ6

CVE-2019-15794 (GCVE-0-2019-15794)

Tags

Sightings

Nomenclature