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Amazon Linux AMI: CVE-2023-4921: Security patch for kernel (ALAS-2023-1838)

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Amazon Linux AMI: CVE-2023-4921: Security patch for kernel (ALAS-2023-1838)

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
09/12/2023
Created
10/11/2023
Added
10/07/2023
Modified
10/07/2023

Description

A use-after-free vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation.

When the plug qdisc is used as a class of the qfq qdisc, sending network packets triggers use-after-free in qfq_dequeue() due to the incorrect .peek handler of sch_plug and lack of error checking in agg_dequeue().

We recommend upgrading past commit 8fc134fee27f2263988ae38920bc03da416b03d8.

Solution(s)

  • amazon-linux-upgrade-kernel

References

  • ALAS-2023-1838
  • CVE-2023-4921

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