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Debian LTS: Security Advisory for linux-4.19 (DLA-2610-1)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
The remote host is missing an update for the 'linux-4.19' package(s) announced via the DLA-2610-1 advisory.
Insight
Insight
Several vulnerabilities have been discovered in the Linux kernel that may lead to the execution of arbitrary code, privilege escalation, denial of service, or information leaks. CVE-2020-27170, CVE-2020-27171 Piotr Krysiuk discovered flaws in the BPF subsystem's checks for information leaks through speculative execution. A local user could use these to obtain sensitive information from kernel memory. CVE-2021-3348 ADlab of venustech discovered a race condition in the nbd block driver that can lead to a use-after-free. A local user with access to an nbd block device could use this to cause a denial of service (crash or memory corruption) or possibly for privilege escalation. CVE-2021-3428 Wolfgang Frisch reported a potential integer overflow in the ext4 filesystem driver. A user permitted to mount arbitrary filesystem images could use this to cause a denial of service (crash). CVE-2021-26930 (XSA-365) Olivier Benjamin, Norbert Manthey, Martin Mazein, and Jan H. Sch?nherr discovered that the Xen block backend driver (xen-blkback) did not handle grant mapping errors correctly. A malicious guest could exploit this bug to cause a denial of service (crash), or possibly an information leak or privilege escalation, within the domain running the backend, which is typically dom0. CVE-2021-26931 (XSA-362), CVE-2021-26932 (XSA-361), CVE-2021-28038 (XSA-367) Jan Beulich discovered that the Xen support code and various Xen backend drivers did not handle grant mapping errors correctly. A malicious guest could exploit these bugs to cause a denial of service (crash) within the domain running the backend, which is typically dom0. CVE-2021-27363 Adam Nichols reported that the iSCSI initiator subsystem did not properly restrict access to transport handle attributes in sysfs. On a system acting as an iSCSI initiator, this is an information leak to local users and makes it easier to exploit CVE-2021-27364. CVE-2021-27364 Adam Nichols reported that the iSCSI initiator subsystem did not properly restrict access to its netlink management interface. On a system acting as an iSCSI initiator, a local user could use these to cause a denial of service (disconnection of storage) or possibly for privilege escalation. CVE-2021-27365 Adam Nichols reported that the iSCSI initiator subsystem did not correctly limit the lengths of parameters or 'passthrough PDUs' sent through its netlink management interface. On a system acting as an iSCSI initiator, a local user could use these to leak the contents of kernel memory, to cause a denial of service (kernel memory corruption or crash), and probably for privilege escalation. CVE-2021-286 ... Description truncated. Please see the references for more information.
Affected Software
Affected Software
'linux-4.19' package(s) on Debian Linux.
Detection Method
Detection Method
Checks if a vulnerable package version is present on the target host.
Solution
Solution
For Debian 9 stretch, these problems have been fixed in version 4.19.181-1~deb9u1. This update additionally fixes Debian bug #983595, and includes many more bug fixes from stable updates 4.19.172-4.19.181 inclusive. We recommend that you upgrade your linux-4.19 packages.