QID 354842

Date Published: 2023-03-23

QID 354842: Amazon Linux Security Advisory for kernel : ALAS-2023-1706

Guests can trigger nic interface reset/abort/crash via netback it is possible for a guest to trigger a nic interface reset/abort/crash in a linux based network backend by sending certain kinds of packets.
It appears to be an (unwritten?)
Assumption in the rest of the linux network stack that packet protocol headers are all contained within the linear section of the skb and some nics behave badly if this is not the case.
This has been reported to occur with cisco (enic) and broadcom netxtrem ii bcm5780 (bnx2x) though it may be an issue with other nics/drivers as well.
In case the frontend is sending requests with split headers, netback will forward those violating above mentioned assumption to the networking core, resulting in said misbehavior. (
( CVE-2022-3643) a null pointer dereference flaw was found in rawv6_push_pending_frames in net/ipv6/raw.c in the network subcomponent in the linux kernel.
This flaw causes the system to crash. (
( CVE-2023-0394)



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 Critical - 10 severity.
  • CVSS V2 rated as Medium - 5.4 severity.
    • Solution
    Please refer to Amazon advisory: ALAS-2023-1706 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 354842

    CVE-2023-0394 | CVE-2022-3643 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS-2023-1706 amazon linux URL Logo alas.aws.amazon.com/ALAS-2023-1706.html
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