github - ghsa-wwf4-95qp-r9vg

GHSA-WWF4-95QP-R9VG

Vulnerability from github – Published: 2024-07-16 12:30 – Updated: 2025-09-24 18:30

Details

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

iio: buffer: Fix file related error handling in IIO_BUFFER_GET_FD_IOCTL

If we fail to copy the just created file descriptor to userland, we try to clean up by putting back 'fd' and freeing 'ib'. The code uses put_unused_fd() for the former which is wrong, as the file descriptor was already published by fd_install() which gets called internally by anon_inode_getfd().

This makes the error handling code leaving a half cleaned up file descriptor table around and a partially destructed 'file' object, allowing userland to play use-after-free tricks on us, by abusing the still usable fd and making the code operate on a dangling 'file->private_data' pointer.

Instead of leaving the kernel in a partially corrupted state, don't attempt to explicitly clean up and leave this to the process exit path that'll release any still valid fds, including the one created by the previous call to anon_inode_getfd(). Simply return -EFAULT to indicate the error.

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-2022-48801"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-16T12:15:04Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: buffer: Fix file related error handling in IIO_BUFFER_GET_FD_IOCTL\n\nIf we fail to copy the just created file descriptor to userland, we\ntry to clean up by putting back \u0027fd\u0027 and freeing \u0027ib\u0027. The code uses\nput_unused_fd() for the former which is wrong, as the file descriptor\nwas already published by fd_install() which gets called internally by\nanon_inode_getfd().\n\nThis makes the error handling code leaving a half cleaned up file\ndescriptor table around and a partially destructed \u0027file\u0027 object,\nallowing userland to play use-after-free tricks on us, by abusing\nthe still usable fd and making the code operate on a dangling\n\u0027file-\u003eprivate_data\u0027 pointer.\n\nInstead of leaving the kernel in a partially corrupted state, don\u0027t\nattempt to explicitly clean up and leave this to the process exit\npath that\u0027ll release any still valid fds, including the one created\nby the previous call to anon_inode_getfd(). Simply return -EFAULT to\nindicate the error.",
  "id": "GHSA-wwf4-95qp-r9vg",
  "modified": "2025-09-24T18:30:23Z",
  "published": "2024-07-16T12:30:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-48801"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/202071d2518537866d291aa7cf26af54e674f4d4"
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  "severity": [
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}

CVE-2022-48801 (GCVE-0-2022-48801)

Vulnerability from cvelistv5 – Published: 2024-07-16 11:43 – Updated: 2025-05-04 08:23

Summary

In the Linux kernel, the following vulnerability has been resolved: iio: buffer: Fix file related error handling in IIO_BUFFER_GET_FD_IOCTL If we fail to copy the just created file descriptor to userland, we try to clean up by putting back 'fd' and freeing 'ib'. The code uses put_unused_fd() for the former which is wrong, as the file descriptor was already published by fd_install() which gets called internally by anon_inode_getfd(). This makes the error handling code leaving a half cleaned up file descriptor table around and a partially destructed 'file' object, allowing userland to play use-after-free tricks on us, by abusing the still usable fd and making the code operate on a dangling 'file->private_data' pointer. Instead of leaving the kernel in a partially corrupted state, don't attempt to explicitly clean up and leave this to the process exit path that'll release any still valid fds, including the one created by the previous call to anon_inode_getfd(). Simply return -EFAULT to indicate the error.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/b7f54894aa7517d2b…
	https://git.kernel.org/stable/c/202071d2518537866…
	https://git.kernel.org/stable/c/c72ea20503610a4a7…

Impacted products

Vendor

Product

Version

Linux

Affected: f73f7f4da581875f9b1f2fb8ebd1ab15ed634488 , < b7f54894aa7517d2b6c797a499b9f491e9db9083 (git)
Affected: f73f7f4da581875f9b1f2fb8ebd1ab15ed634488 , < 202071d2518537866d291aa7cf26af54e674f4d4 (git)
Affected: f73f7f4da581875f9b1f2fb8ebd1ab15ed634488 , < c72ea20503610a4a7ba26c769357d31602769c01 (git)

Linux

Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.24 , ≤ 5.15.* (semver)
Unaffected: 5.16.10 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)

Show details on NVD website

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-WWF4-95QP-R9VG

CVE-2022-48801 (GCVE-0-2022-48801)

Tags

Sightings

Nomenclature