CVE-2021-33909

Advisory lineage Upstream: 0 Downstream: 64
Modified
Published: 20 Jul 2021, 18:01
Last modified:04 Aug 2024, 00:05

Vulnerability Summary

Overall Risk (default)
medium
42/100
CVSS Score
7.8 HIGH
v3.1 (nvd)
EPSS Score
1.78% LOW
2% probability -0.44%
KEV
Not listed
Ransomware
No reports
Public exploits
2 found
Dark Web
Not detected

Timeline

20 Jul 2021, 18:01
Published
Vulnerability first disclosed
04 Aug 2024, 00:05
Last Modified
Vulnerability information updated

Description

fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  • v2.0•HIGH•Score: 7.2AV:L/AC:L/Au:N/C:C/I:C/A:C

EPSS Trends

Current EPSS score: 1.78%• Percentile: 83%

Techniques & Countermeasures

  • CWE-190•Integer Overflow or Wraparound

    The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

  • CWE-787•Out-of-bounds Write

    The product writes data past the end, or before the beginning, of the intended buffer.

Affected Systems

  • debian•debian_linux

    9.0 | 10.0

  • fedoraproject•fedora

    34

  • linux•linux_kernel

    ≥ 3.12.43, < 3.13 | ≥ 3.16, < 4.4.276 | ≥ 4.5, < 4.9.276 | ≥ 4.10, < 4.14.240 | ≥ 4.15, < 4.19.198 | ≥ 4.20, < 5.4.134 | ≥ 5.5, < 5.10.52 | ≥ 5.11, < 5.12.19 | ≥ 5.13, < 5.13.4

  • netapp•hci_management_node

    na

  • netapp•solidfire

    na

  • oracle•communications_session_border_controller

    8.2 | 8.3 | 8.4 | 9.0

  • sonicwall•sma1000

    ≤ 12.4.2-02044

References (20)