lsn-0082-1
Vulnerability from osv_ubuntu
Published
2021-11-11 06:14
Modified
2026-06-03 10:46
Summary
Kernel Live Patch Security Notice
Details

Jann Horn discovered that the tty subsystem of the Linux kernel did not use consistent locking in some situations, leading to a read-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information (kernel memory).(CVE-2020-29660)

Jann Horn discovered a race condition in the tty subsystem of the Linux kernel in the locking for the TIOCSPGRP ioctl(), leading to a use-after- free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.(CVE-2020-29661)

De4dCr0w of 360 Alpha Lab discovered that the BPF verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker could use this to expose sensitive information (kernel memory) or possibly execute arbitrary code.(CVE-2021-3444)

kernel: use-after-free in route4_change() in net/sched/cls_route.c(CVE-2021-3715)

References
To clipboard 

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    },
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      "ecosystem_specific": {
        "availability": "Livepatch subscription required",
        "module_name_regex": "lkp_Ubuntu_5_4_0[_|\\d]+_(?:generic|lowlatency)_(\\d+)",
        "module_version": "82"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "linux",
        "purl": "pkg:deb/ubuntu/linux@5.4.0-70.78?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.3.0-18.19",
        "5.3.0-24.26",
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    {
      "ecosystem_specific": {
        "availability": "Livepatch subscription required",
        "module_name_regex": "lkp_Ubuntu_5_4_0[_|\\d]+_gcp_(\\d+)",
        "module_version": "82"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "linux-gcp",
        "purl": "pkg:deb/ubuntu/linux-gcp@5.4.0-1040.43?arch=source\u0026distro=focal"
      },
      "ranges": [
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          "events": [
            {
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            {
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          ],
          "type": "ECOSYSTEM"
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      "versions": [
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        "5.4.0-1038.41"
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    },
    {
      "ecosystem_specific": {
        "availability": "Livepatch subscription required",
        "module_name_regex": "lkp_Ubuntu_5_4_0[_|\\d]+_gke_(\\d+)",
        "module_version": "82"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "linux-gke",
        "purl": "pkg:deb/ubuntu/linux-gke@5.4.0-1039.41?arch=source\u0026distro=focal"
      },
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          "type": "ECOSYSTEM"
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    {
      "ecosystem_specific": {
        "availability": "Livepatch subscription required",
        "module_name_regex": "lkp_Ubuntu_5_4_0[_|\\d]+_gkeop_(\\d+)",
        "module_version": "82"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "linux-gkeop",
        "purl": "pkg:deb/ubuntu/linux-gkeop@5.4.0-1012.13?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
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              "introduced": "0"
            },
            {
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.4.0-1008.9",
        "5.4.0-1009.10",
        "5.4.0-1010.11",
        "5.4.0-1011.12"
      ]
    }
  ],
  "aliases": [],
  "details": "Jann Horn discovered that the tty subsystem of the Linux kernel did not use\nconsistent locking in some situations, leading to a read-after-free\nvulnerability. A local attacker could use this to cause a denial of service\n(system crash) or possibly expose sensitive information (kernel memory).(CVE-2020-29660)\n\nJann Horn discovered a race condition in the tty subsystem of the Linux\nkernel in the locking for the TIOCSPGRP ioctl(), leading to a use-after-\nfree vulnerability. A local attacker could use this to cause a denial of\nservice (system crash) or possibly execute arbitrary code.(CVE-2020-29661)\n\nDe4dCr0w of 360 Alpha Lab discovered that the BPF verifier in the Linux\nkernel did not properly handle mod32 destination register truncation when\nthe source register was known to be 0. A local attacker could use this to\nexpose sensitive information (kernel memory) or possibly execute arbitrary\ncode.(CVE-2021-3444)\n\nkernel: use-after-free in route4_change() in\nnet/sched/cls_route.c(CVE-2021-3715)",
  "id": "LSN-0082-1",
  "modified": "2026-06-03T10:46:31Z",
  "published": "2021-11-11T06:14:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/LSN-0082-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-29660"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-29661"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3444"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3715"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "Kernel Live Patch Security Notice",
  "upstream": [
    "UBUNTU-CVE-2020-29660",
    "UBUNTU-CVE-2020-29661",
    "UBUNTU-CVE-2021-3444",
    "UBUNTU-CVE-2021-3715"
  ]
}



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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.