QID 353149

Date Published: 2022-02-01

QID 353149: Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.4-2022-002

an issue was discovered in the linux kernel.
Fastrpc_internal_invoke in drivers/misc/fastrpc.c does not prevent user applications from sending kernel rpc messages.
This is a related issue to( CVE-2019-2308. (
( CVE-2021-28375) a flaw was found in the linux kernel.
The rtw_wx_set_scan driver allows writing beyond the end of the ->ssid[] array.
The highest threat from this vulnerability is to data confidentiality and integrity as well system availability. (
( CVE-2021-28660) the fix for xsa-365 includes initialization of pointers such that subsequent cleanup code wouldnt use uninitialized or stale values.
This initialization went too far and may under certain conditions also overwrite pointers which are in need of cleaning up.
The lack of cleanup would result in leaking persistent grants.
The leak in turn would prevent fully cleaning up after a respective guest has died, leaving around zombie domains.
All linux versions having the fix for xsa-365 applied are vulnerable.
Xsa-365 was classified to affect versions back to at least 3.11. (
( CVE-2021-28688) a race condition flaw was found in get_old_root in fs/btrfs/ctree.c in the linux kernel in btrfs file-system.
This flaw allows a local attacker with a special user privilege to cause a denial of service due to not locking an extent buffer before a cloning operation.
The highest threat from this vulnerability is to system availability. (
( CVE-2021-28964) a flaw was found in the linux kernel.
On some haswell cpus, userspace applications (such as perf-fuzzer) can cause a system crash because the pebs status in a pebs record is mishandled. (
( CVE-2021-29650)



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 High - 7.2 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2KERNEL-5.4-2022-002 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 353149

    CVE-2021-29650 | CVE-2021-28964 | CVE-2021-28375 | CVE-2021-28688 | CVE-2021-28660 | CVE-2021-28971 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2KERNEL-5.4-2022-002 Amazon Linux 2 URL Logo alas.aws.amazon.com/AL2/ALASKERNEL-5.4-2022-002.html
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