CVE-2021-47358 (GCVE-0-2021-47358)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:44 – Updated: 2026-08-05 08:47
VLAI
Title
staging: greybus: uart: fix tty use after free
Summary
In the Linux kernel, the following vulnerability has been resolved: staging: greybus: uart: fix tty use after free User space can hold a tty open indefinitely and tty drivers must not release the underlying structures until the last user is gone. Switch to using the tty-port reference counter to manage the life time of the greybus tty state to avoid use after free after a disconnect.
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: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a18e15175708d39abbe9746ddc3479466b7800c3 , < 92b67aaafb7c449db9f0c3dcabc0ff967cb3a42d (git)
Affected: a18e15175708d39abbe9746ddc3479466b7800c3 , < 64062fcaca8872f063ec9da011e7bf30470be33f (git)
Affected: a18e15175708d39abbe9746ddc3479466b7800c3 , < a5cfd51f6348e8fd7531461366946039c29c7e69 (git)
Affected: a18e15175708d39abbe9746ddc3479466b7800c3 , < 4dc56951a8d9d61d364d346c61a5f1d70b4f5e14 (git)
Affected: a18e15175708d39abbe9746ddc3479466b7800c3 , < b9e697e60ce9890e9258a73eb061288e7d68e5e6 (git)
Affected: a18e15175708d39abbe9746ddc3479466b7800c3 , < 9872ff6fdce8b229f01993b611b5d1719cb70ff1 (git)
Affected: a18e15175708d39abbe9746ddc3479466b7800c3 , < 92dc0b1f46e12cfabd28d709bb34f7a39431b44f (git)
Create a notification for this product.
Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (semver)
Unaffected: 4.9.285 , ≤ 4.9.* (semver)
Unaffected: 4.14.249 , ≤ 4.14.* (semver)
Unaffected: 4.19.209 , ≤ 4.19.* (semver)
Unaffected: 5.4.150 , ≤ 5.4.* (semver)
Unaffected: 5.10.70 , ≤ 5.10.* (semver)
Unaffected: 5.14.9 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:58:14+00:00",
      "cve": "CVE-2021-47358",
      "id": "CVE-2021-47358",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: staging: greybus: uart: fix tty use after free",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47358.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-08T00:05:46Z",
      "cve": "CVE-2021-47358",
      "id": "CVE-2021-47358",
      "initial_release_date": "2024-05-23T03:04:34Z",
      "product_status:known_affected": "340",
      "product_status:known_not_affected": "93",
      "product_status:recommended": "452",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47358",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47358.json",
      "version": "56"
    },
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      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.