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amazonAmazonALAS-2022-1624
HistoryJul 28, 2022 - 8:37 p.m.

Important: kernel

2022-07-2820:37:00
alas.aws.amazon.com
29
kernel
use-after-free
vulnerabilities
data leaks
linux frontends
arm guests
dos

CVSS2

4.9

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:N/I:N/A:C

CVSS3

7.1

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS

0.001

Percentile

27.5%

Issue Overview:

There are use-after-free vulnerabilities caused by timer handler in net/rose/rose_timer.c of linux that allow attackers to crash linux kernel without any privileges. (CVE-2022-2318)

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

Issue Correction:
Run yum update kernel to update your system.

New Packages:

i686:  
    perf-4.14.287-148.504.amzn1.i686  
    kernel-headers-4.14.287-148.504.amzn1.i686  
    kernel-tools-4.14.287-148.504.amzn1.i686  
    kernel-devel-4.14.287-148.504.amzn1.i686  
    kernel-4.14.287-148.504.amzn1.i686  
    kernel-tools-devel-4.14.287-148.504.amzn1.i686  
    perf-debuginfo-4.14.287-148.504.amzn1.i686  
    kernel-debuginfo-4.14.287-148.504.amzn1.i686  
    kernel-tools-debuginfo-4.14.287-148.504.amzn1.i686  
    kernel-debuginfo-common-i686-4.14.287-148.504.amzn1.i686  
  
src:  
    kernel-4.14.287-148.504.amzn1.src  
  
x86_64:  
    perf-debuginfo-4.14.287-148.504.amzn1.x86_64  
    kernel-debuginfo-common-x86_64-4.14.287-148.504.amzn1.x86_64  
    perf-4.14.287-148.504.amzn1.x86_64  
    kernel-tools-debuginfo-4.14.287-148.504.amzn1.x86_64  
    kernel-tools-4.14.287-148.504.amzn1.x86_64  
    kernel-4.14.287-148.504.amzn1.x86_64  
    kernel-tools-devel-4.14.287-148.504.amzn1.x86_64  
    kernel-devel-4.14.287-148.504.amzn1.x86_64  
    kernel-debuginfo-4.14.287-148.504.amzn1.x86_64  
    kernel-headers-4.14.287-148.504.amzn1.x86_64  

Additional References

Red Hat: CVE-2022-2318, CVE-2022-26365, CVE-2022-33740, CVE-2022-33741, CVE-2022-33742, CVE-2022-33744

Mitre: CVE-2022-2318, CVE-2022-26365, CVE-2022-33740, CVE-2022-33741, CVE-2022-33742, CVE-2022-33744

CVSS2

4.9

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:N/I:N/A:C

CVSS3

7.1

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS

0.001

Percentile

27.5%