Amazon Linux 2 Security Advisory: ALASKERNEL-5.4-2022-033
Advisory Release Date: 2022-07-19 16:02 Pacific
Advisory Updated Date: 2022-07-21 16:10 Pacific
FAQs regarding Amazon Linux ALAS/CVE Severity
Linux disk/nic frontends data leaks T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Linux Block and Network PV device frontends don't zero memory regions before sharing them with the backend (CVE-2022-26365, CVE-2022-33740). Additionally the granularity of the grant table doesn't allow sharing less than a 4K page, leading to unrelated data residing in the same 4K page as data shared with a backend being accessible by such backend (CVE-2022-33741, CVE-2022-33742). (CVE-2022-26365)
Linux disk/nic frontends data leaks T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Linux Block and Network PV device frontends don't zero memory regions before sharing them with the backend (CVE-2022-26365, CVE-2022-33740). Additionally the granularity of the grant table doesn't allow sharing less than a 4K page, leading to unrelated data residing in the same 4K page as data shared with a backend being accessible by such backend (CVE-2022-33741, CVE-2022-33742). (CVE-2022-33740)
Linux disk/nic frontends data leaks T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Linux Block and Network PV device frontends don't zero memory regions before sharing them with the backend (CVE-2022-26365, CVE-2022-33740). Additionally the granularity of the grant table doesn't allow sharing less than a 4K page, leading to unrelated data residing in the same 4K page as data shared with a backend being accessible by such backend (CVE-2022-33741, CVE-2022-33742). (CVE-2022-33741)
Linux disk/nic frontends data leaks T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Linux Block and Network PV device frontends don't zero memory regions before sharing them with the backend (CVE-2022-26365, CVE-2022-33740). Additionally the granularity of the grant table doesn't allow sharing less than a 4K page, leading to unrelated data residing in the same 4K page as data shared with a backend being accessible by such backend (CVE-2022-33741, CVE-2022-33742). (CVE-2022-33742)
Arm guests can cause Dom0 DoS via PV devices When mapping pages of guests on Arm, dom0 is using an rbtree to keep track of the foreign mappings. Updating of that rbtree is not always done completely with the related lock held, resulting in a small race window, which can be used by unprivileged guests via PV devices to cause inconsistencies of the rbtree. These inconsistencies can lead to Denial of Service (DoS) of dom0, e.g. by causing crashes or the inability to perform further mappings of other guests' memory pages. (CVE-2022-33744)
Affected Packages:
kernel
Note:
This advisory is applicable to Amazon Linux 2 - Kernel-5.4 Extra. Visit this page to learn more about Amazon Linux 2 (AL2) Extras and this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update kernel to update your system.
aarch64:
kernel-5.4.204-113.362.amzn2.aarch64
kernel-headers-5.4.204-113.362.amzn2.aarch64
kernel-debuginfo-common-aarch64-5.4.204-113.362.amzn2.aarch64
perf-5.4.204-113.362.amzn2.aarch64
perf-debuginfo-5.4.204-113.362.amzn2.aarch64
python-perf-5.4.204-113.362.amzn2.aarch64
python-perf-debuginfo-5.4.204-113.362.amzn2.aarch64
kernel-tools-5.4.204-113.362.amzn2.aarch64
kernel-tools-devel-5.4.204-113.362.amzn2.aarch64
kernel-tools-debuginfo-5.4.204-113.362.amzn2.aarch64
bpftool-5.4.204-113.362.amzn2.aarch64
bpftool-debuginfo-5.4.204-113.362.amzn2.aarch64
kernel-devel-5.4.204-113.362.amzn2.aarch64
kernel-debuginfo-5.4.204-113.362.amzn2.aarch64
i686:
kernel-headers-5.4.204-113.362.amzn2.i686
src:
kernel-5.4.204-113.362.amzn2.src
x86_64:
kernel-5.4.204-113.362.amzn2.x86_64
kernel-headers-5.4.204-113.362.amzn2.x86_64
kernel-debuginfo-common-x86_64-5.4.204-113.362.amzn2.x86_64
perf-5.4.204-113.362.amzn2.x86_64
perf-debuginfo-5.4.204-113.362.amzn2.x86_64
python-perf-5.4.204-113.362.amzn2.x86_64
python-perf-debuginfo-5.4.204-113.362.amzn2.x86_64
kernel-tools-5.4.204-113.362.amzn2.x86_64
kernel-tools-devel-5.4.204-113.362.amzn2.x86_64
kernel-tools-debuginfo-5.4.204-113.362.amzn2.x86_64
bpftool-5.4.204-113.362.amzn2.x86_64
bpftool-debuginfo-5.4.204-113.362.amzn2.x86_64
kernel-devel-5.4.204-113.362.amzn2.x86_64
kernel-debuginfo-5.4.204-113.362.amzn2.x86_64