QID 355130

Date Published: 2023-05-29

QID 355130: Amazon Linux Security Advisory for kernel : ALAS2023-2023-132

It has been discovered that on some amd cpus, the ras (return address stack, also called rap - return address predictor - in some amd documentation, and rsb - return stack buffer - in intel terminology) is dynamically partitioned between non-idle threads.
This allows an attacker to control speculative execution on the adjacent thread. (
( CVE-2022-27672) the upstream bug report describes this issue as follows: a flaw found in the linux kernel in rds (reliable datagram sockets) protocol.
The rds_rm_zerocopy_callback() uses list_entry() on the head of a list causing a type confusion.
Local user can trigger this with rds_message_put().
Type confusion leads to `struct rds_msg_zcopy_info *info` actually points to something else that is potentially controlled by local user.
It is known how to trigger this, which causes an oob access, and a lock corruption. (
( CVE-2023-1078)



Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.

  • CVSS V3 rated as High - 7.8 severity.
  • CVSS V2 rated as Medium - 5.4 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2023-2023-132 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 355130

    CVE-2022-27672 | CVE-2023-1078 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2023-2023-132 amazon linux 2023 URL Logo alas.aws.amazon.com/AL2023/ALAS-2023-132.html
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