Debian: Security Advisory for linux (DSA-4978-1)

Published: 2021-09-26 01:00:15
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:



severity_date=2021-08-05 18:09:00 +0000 (Thu, 05 Aug 2021)

The remote host is missing an update for the 'linux' Linux Distribution Package(s) announced via the DSA-4978-1 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks. CVE-2020-3702 A flaw was found in the driver for Atheros IEEE 802.11n family of chipsets (ath9k) allowing information disclosure. CVE-2020-16119 Hadar Manor reported a use-after-free in the DCCP protocol implementation in the Linux kernel. A local attacker can take advantage of this flaw to cause a denial of service or potentially to execute arbitrary code. CVE-2021-3653 Maxim Levitsky discovered a vulnerability in the KVM hypervisor implementation for AMD processors in the Linux kernel: Missing validation of the `int_ctl` VMCB field could allow a malicious L1 guest to enable AVIC support (Advanced Virtual Interrupt Controller) for the L2 guest. The L2 guest can take advantage of this flaw to write to a limited but still relatively large subset of the host physical memory. CVE-2021-3656 Maxim Levitsky and Paolo Bonzini discovered a flaw in the KVM hypervisor implementation for AMD processors in the Linux kernel. Missing validation of the `virt_ext` VMCB field could allow a malicious L1 guest to disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. Under these circumstances, the L2 guest is able to run VMLOAD/VMSAVE unintercepted and thus read/write portions of the host's physical memory. CVE-2021-3679 A flaw in the Linux kernel tracing module functionality could allow a privileged local user (with CAP_SYS_ADMIN capability) to cause a denial of service (resource starvation). CVE-2021-3732 Alois Wohlschlager reported a flaw in the implementation of the overlayfs subsystem, allowing a local attacker with privileges to mount a filesystem to reveal files hidden in the original mount. CVE-2021-3739 A NULL pointer dereference flaw was found in the btrfs filesystem, allowing a local attacker with CAP_SYS_ADMIN capabilities to cause a denial of service. CVE-2021-3743 An out-of-bounds memory read was discovered in the Qualcomm IPC router protocol implementation, allowing to cause a denial of service or information leak. CVE-2021-3753 Minh Yuan reported a race condition in the vt_k_ioctl in drivers/tty/vt/vt_ioctl.c, which may cause an out of bounds read in vt. CVE-2021-37576 Alexey Kardashevskiy reported a buffer overflow in the KVM subsystem on the powerpc platform, which allows KVM guest OS users to cause memory corruption on the host. CVE-2021-38160 A flaw in the virtio_console was discovered allowing data corruption or data loss by an untrusted device. CVE-2021-38166 An integer overflow flaw in the BPF subsystem co ... Description truncated. Please see the references for more information.

Affected Versions:
'linux' Linux Distribution Package(s) on Debian Linux.

For the stable distribution (bullseye), these problems have been fixed in version 5.10.46-5. This update includes fixes for #993948 and #993978. We recommend that you upgrade your linux Linux Distribution Packages.

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)


CVSS Score
Debian Local Security Checks

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