usn-4949-1
Vulnerability from osv_ubuntu
Published
2021-05-11 22:37
Modified
2026-06-03 10:45
Summary
linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle, linux-raspi vulnerabilities
Details

Ryota Shiga discovered that the eBPF implementation in the Linux kernel did not properly verify that a BPF program only reserved as much memory for a ring buffer as was allocated. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2021-3489)

Manfred Paul discovered that the eBPF implementation in the Linux kernel did not properly track bounds on bitwise operations. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2021-3490)

Billy Jheng Bing-Jhong discovered that the io_uring implementation of the Linux kernel did not properly enforce the MAX_RW_COUNT limit in some situations. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2021-3491)

It was discovered that the Nouveau GPU driver in the Linux kernel did not properly handle error conditions in some situations. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-25639)

Olivier Benjamin, Norbert Manthey, Martin Mazein, and Jan H. Schönherr discovered that the Xen paravirtualization backend in the Linux kernel did not properly propagate errors to frontend drivers in some situations. An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash). (CVE-2021-26930)

Jan Beulich discovered that multiple Xen backends in the Linux kernel did not properly handle certain error conditions under paravirtualization. An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash). (CVE-2021-26931)

It was discovered that the fastrpc driver in the Linux kernel did not prevent user space applications from sending kernel RPC messages. A local attacker could possibly use this to gain elevated privileges. (CVE-2021-28375)

It was discovered that the Freescale Gianfar Ethernet driver for the Linux kernel did not properly handle receive queue overrun when jumbo frames were enabled in some situations. An attacker could use this to cause a denial of service (system crash). (CVE-2021-29264)

It was discovered that the USB/IP driver in the Linux kernel contained race conditions during the update of local and shared status. An attacker could use this to cause a denial of service (system crash). (CVE-2021-29265)

It was discovered that the vDPA backend virtio driver in the Linux kernel contained a use-after-free vulnerability. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-29266)

It was discovered that the TIPC protocol implementation in the Linux kernel did not properly validate passed encryption key sizes. A local attacker could use this to cause a denial of service (system crash). (CVE-2021-29646)

It was discovered that a race condition existed in the netfilter subsystem of the Linux kernel when replacing tables. A local attacker could use this to cause a denial of service (system crash). (CVE-2021-29650)

References
To clipboard 

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          {
            "binary_name": "serial-modules-5.8.0-53-generic-di",
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            "binary_version": "5.8.0-53.60~20.04.1"
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          {
            "binary_name": "usb-modules-5.8.0-53-generic-64k-di",
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          },
          {
            "binary_name": "usb-modules-5.8.0-53-generic-di",
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          {
            "binary_name": "usb-modules-5.8.0-53-generic-lpae-di",
            "binary_version": "5.8.0-53.60~20.04.1"
          },
          {
            "binary_name": "virtio-modules-5.8.0-53-generic-64k-di",
            "binary_version": "5.8.0-53.60~20.04.1"
          },
          {
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        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "linux-hwe-5.8",
        "purl": "pkg:deb/ubuntu/linux-hwe-5.8@5.8.0-53.60~20.04.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.8.0-53.60~20.04.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.8.0-23.24~20.04.1",
        "5.8.0-25.26~20.04.1",
        "5.8.0-28.30~20.04.1",
        "5.8.0-29.31~20.04.1",
        "5.8.0-31.33~20.04.1",
        "5.8.0-33.36~20.04.1",
        "5.8.0-34.37~20.04.2",
        "5.8.0-36.40~20.04.1",
        "5.8.0-38.43~20.04.1",
        "5.8.0-40.45~20.04.1",
        "5.8.0-41.46~20.04.1",
        "5.8.0-43.49~20.04.1",
        "5.8.0-44.50~20.04.1",
        "5.8.0-45.51~20.04.1",
        "5.8.0-48.54~20.04.1",
        "5.8.0-49.55~20.04.1",
        "5.8.0-50.56~20.04.1"
      ]
    }
  ],
  "aliases": [],
  "details": "Ryota Shiga discovered that the eBPF implementation in the Linux kernel did\nnot properly verify that a BPF program only reserved as much memory for a\nring buffer as was allocated. A local attacker could use this to cause a\ndenial of service (system crash) or execute arbitrary code. (CVE-2021-3489)\n\nManfred Paul discovered that the eBPF implementation in the Linux kernel\ndid not properly track bounds on bitwise operations. A local attacker could\nuse this to cause a denial of service (system crash) or execute arbitrary\ncode. (CVE-2021-3490)\n\nBilly Jheng Bing-Jhong discovered that the io_uring implementation of the\nLinux kernel did not properly enforce the MAX_RW_COUNT limit in some\nsituations. A local attacker could use this to cause a denial of service\n(system crash) or execute arbitrary code. (CVE-2021-3491)\n\nIt was discovered that the Nouveau GPU driver in the Linux kernel did not\nproperly handle error conditions in some situations. A local attacker could\nuse this to cause a denial of service (system crash). (CVE-2020-25639)\n\nOlivier Benjamin, Norbert Manthey, Martin Mazein, and Jan H. Sch\u00f6nherr\ndiscovered that the Xen paravirtualization backend in the Linux kernel did\nnot properly propagate errors to frontend drivers in some situations. An\nattacker in a guest VM could possibly use this to cause a denial of service\n(host domain crash). (CVE-2021-26930)\n\nJan Beulich discovered that multiple Xen backends in the Linux kernel did\nnot properly handle certain error conditions under paravirtualization. An\nattacker in a guest VM could possibly use this to cause a denial of service\n(host domain crash). (CVE-2021-26931)\n\nIt was discovered that the fastrpc driver in the Linux kernel did not\nprevent user space applications from sending kernel RPC messages. A local\nattacker could possibly use this to gain elevated privileges.\n(CVE-2021-28375)\n\nIt was discovered that the Freescale Gianfar Ethernet driver for the Linux\nkernel did not properly handle receive queue overrun when jumbo frames were\nenabled in some situations. An attacker could use this to cause a denial of\nservice (system crash). (CVE-2021-29264)\n\nIt was discovered that the USB/IP driver in the Linux kernel contained race\nconditions during the update of local and shared status. An attacker could\nuse this to cause a denial of service (system crash). (CVE-2021-29265)\n\nIt was discovered that the vDPA backend virtio driver in the Linux kernel\ncontained a use-after-free vulnerability. An attacker could use this to\ncause a denial of service (system crash) or possibly execute arbitrary\ncode. (CVE-2021-29266)\n\nIt was discovered that the TIPC protocol implementation in the Linux kernel\ndid not properly validate passed encryption key sizes. A local attacker\ncould use this to cause a denial of service (system crash).\n(CVE-2021-29646)\n\nIt was discovered that a race condition existed in the netfilter subsystem\nof the Linux kernel when replacing tables. A local attacker could use this\nto cause a denial of service (system crash). (CVE-2021-29650)\n",
  "id": "USN-4949-1",
  "modified": "2026-06-03T10:45:25Z",
  "published": "2021-05-11T22:37:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4949-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-25639"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3489"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3490"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3491"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-26930"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-26931"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-28375"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-29264"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-29265"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-29266"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-29646"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-29650"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle, linux-raspi vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2020-25639",
    "UBUNTU-CVE-2021-3489",
    "UBUNTU-CVE-2021-3490",
    "UBUNTU-CVE-2021-3491",
    "UBUNTU-CVE-2021-26930",
    "UBUNTU-CVE-2021-26931",
    "UBUNTU-CVE-2021-28375",
    "UBUNTU-CVE-2021-29264",
    "UBUNTU-CVE-2021-29265",
    "UBUNTU-CVE-2021-29266",
    "UBUNTU-CVE-2021-29646",
    "UBUNTU-CVE-2021-29650"
  ]
}



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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.