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Amazon Linux AMI: CVE-2021-26931: Security patch for kernel (ALAS-2021-1487)

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Amazon Linux AMI: CVE-2021-26931: Security patch for kernel (ALAS-2021-1487)

Severity
2
CVSS
(AV:L/AC:M/Au:N/C:N/I:N/A:P)
Published
02/17/2021
Created
03/23/2021
Added
03/20/2021
Modified
10/14/2022

Description

An issue was discovered in the Linux kernel 2.6.39 through 5.10.16, as used in Xen. Block, net, and SCSI backends consider certain errors a plain bug, deliberately causing a kernel crash. For errors potentially being at least under the influence of guests (such as out of memory conditions), it isn't correct to assume a plain bug. Memory allocations potentially causing such crashes occur only when Linux is running in PV mode, though. This affects drivers/block/xen-blkback/blkback.c and drivers/xen/xen-scsiback.c.

Solution(s)

  • amazon-linux-upgrade-kernel

References

  • ALAS-2021-1487
  • CVE-2021-26931
  • USN-4904-1
  • USN-4909-1
  • USN-4946-1
  • USN-4949-1

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