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Debian LTS: Security Advisory for linux (DLA-2843-1)







Debian Local Security Checks

CVSSv2 Base

CVSSv2 Base


CVSSv2 Vector

CVSSv2 Vector


Solution Type

Solution Type

Vendor Patch



5 months ago



5 months ago


The remote host is missing an update for the 'linux' package(s) announced via the DLA-2843-1 advisory.



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-2021-0920 A race condition was discovered in the local sockets (AF_UNIX) subsystem, which could lead to a use-after-free. A local user could exploit this for denial of service (memory corruption or crash), or possibly for privilege escalation. CVE-2021-3612 Murray McAllister reported a flaw in the joystick input subsystem. A local user permitted to access a joystick device could exploit this to read and write out-of-bounds in the kernel, which could be used for privilege escalation. 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-2021-3655 Ilja Van Sprundel and Marcelo Ricardo Leitner found multiple flaws in the SCTP implementation, where missing validation could lead to an out-of-bounds read. On a system using SCTP, a networked attacker could exploit these to cause a denial of service (crash). 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-2021-3753 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-2021-3760 Lin Horse reported a flaw in the NCI (NFC Controller Interface) driver, which could lead to a use-after-free. However, this driver is not included in the binary packages provided by Debian. CVE-2021-20317 It was discovered that the timer queue structure could become corrupt, leading to waiting tasks never being woken up. A local user with certain privileges could exploit this to ca ... Description truncated. Please see the references for more information.

Affected Software

Affected Software

'linux' package(s) on Debian Linux.

Detection Method

Detection Method

Checks if a vulnerable package version is present on the target host.



For Debian 9 stretch, these problems have been fixed in version 4.9.290-1. We recommend that you upgrade your linux packages.

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Citations 1. Costs and Consequences of Gaps in Vulnerability Response, Ponemom Institute 2. Cost of a Data Breach Report 2021, IBM

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