[USN-4999-1] Linux kernel vulnerabilities

========================================================================== Ubuntu Security Notice USN-4999-1 June 23, 2021
linux, linux-aws, linux-aws-5.8, linux-azure, linux-azure-5.8, linux-gcp, linux-gcp-5.8, linux-hwe-5.8, linux-kvm, linux-oracle, linux-oracle-5.8, linux-raspi vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 20.10 – Ubuntu 20.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description: – linux: Linux kernel – linux-aws: Linux kernel for Amazon Web Services (AWS) systems – linux-azure: Linux kernel for Microsoft Azure Cloud systems – linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems – linux-kvm: Linux kernel for cloud environments – linux-oracle: Linux kernel for Oracle Cloud systems – linux-raspi: Linux kernel for Raspberry Pi (V8) systems – linux-aws-5.8: Linux kernel for Amazon Web Services (AWS) systems – linux-azure-5.8: Linux kernel for Microsoft Azure cloud systems – linux-gcp-5.8: Linux kernel for Google Cloud Platform (GCP) systems – linux-hwe-5.8: Linux hardware enablement (HWE) kernel – linux-oracle-5.8: Linux kernel for Oracle Cloud systems
Details:
Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute arbitrary code. (CVE-2021-3609)
Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly enforce limits for pointer operations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-33200)
Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did not properly clear received fragments from memory in some situations. A physically proximate attacker could possibly use this issue to inject packets or expose sensitive information. (CVE-2020-24586)
Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled encrypted fragments. A physically proximate attacker could possibly use this issue to decrypt fragments. (CVE-2020-24587)
Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled certain malformed frames. If a user were tricked into connecting to a malicious server, a physically proximate attacker could use this issue to inject packets. (CVE-2020-24588)
Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the Linux kernel contained a reference counting error. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-25670)
Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the Linux kernel did not properly deallocate memory in certain error situations. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2020-25671, CVE-2020-25672)
Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the Linux kernel did not properly handle error conditions in some situations, leading to an infinite loop. A local attacker could use this to cause a denial of service. (CVE-2020-25673)
Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled EAPOL frames from unauthenticated senders. A physically proximate attacker could inject malicious packets to cause a denial of service (system crash). (CVE-2020-26139)
Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did not properly verify certain fragmented frames. A physically proximate attacker could possibly use this issue to inject or decrypt packets. (CVE-2020-26141)
Mathy Vanhoef discovered that the in the Linux kernel’s WiFi implementation leading to accepting plaintext fragments. A physically proximate attacker could use this issue to inject packets. (CVE-2020-26145)
Mathy Vanhoef discovered that the the Linux kernel’s WiFi implementation leading to reassembling mixed encrypted and plaintext fragments. A physically proximate attacker could possibly use this issue to inject packets or exfiltrate selected fragments. (CVE-2020-26147)
Or Cohen discovered that the SCTP implementation in the Linux kernel contained a race condition in some situations, leading to a use-after-free condition. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-23133)
Piotr Krysiuk and Benedict Schlueter discovered that the eBPF implementation in the Linux kernel performed out of bounds speculation on pointer arithmetic. A local attacker could use this to expose sensitive information. (CVE-2021-29155)
Manfred Paul discovered that the extended Berkeley Packet Filter (eBPF) implementation in the Linux kernel contained an out-of-bounds vulnerability. A local attacker could use this issue to execute arbitrary code. (CVE-2021-31440)
Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly prevent speculative loads in certain situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2021-31829)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.10: linux-image-5.8.0-1029-raspi 5.8.0-1029.32 linux-image-5.8.0-1029-raspi-nolpae 5.8.0-1029.32 linux-image-5.8.0-1030-kvm 5.8.0-1030.32 linux-image-5.8.0-1033-oracle 5.8.0-1033.34 linux-image-5.8.0-1035-gcp 5.8.0-1035.37 linux-image-5.8.0-1036-azure 5.8.0-1036.38 linux-image-5.8.0-1038-aws 5.8.0-1038.40 linux-image-5.8.0-59-generic 5.8.0-59.66 linux-image-5.8.0-59-generic-64k 5.8.0-59.66 linux-image-5.8.0-59-generic-lpae 5.8.0-59.66 linux-image-5.8.0-59-lowlatency 5.8.0-59.66 linux-image-aws 5.8.0.1038.40 linux-image-azure 5.8.0.1036.36 linux-image-gcp 5.8.0.1035.35 linux-image-generic 5.8.0.59.64 linux-image-generic-64k 5.8.0.59.64 linux-image-generic-lpae 5.8.0.59.64 linux-image-gke 5.8.0.1035.35 linux-image-kvm 5.8.0.1030.32 linux-image-lowlatency 5.8.0.59.64 linux-image-oracle 5.8.0.1033.32 linux-image-raspi 5.8.0.1029.31 linux-image-raspi-nolpae 5.8.0.1029.31 linux-image-virtual 5.8.0.59.64
Ubuntu 20.04 LTS: linux-image-5.8.0-1033-oracle 5.8.0-1033.34~20.04.1 linux-image-5.8.0-1035-gcp 5.8.0-1035.37~20.04.1 linux-image-5.8.0-1036-azure 5.8.0-1036.38~20.04.1 linux-image-5.8.0-1038-aws 5.8.0-1038.40~20.04.1 linux-image-5.8.0-59-generic 5.8.0-59.66~20.04.1 linux-image-5.8.0-59-generic-64k 5.8.0-59.66~20.04.1 linux-image-5.8.0-59-generic-lpae 5.8.0-59.66~20.04.1 linux-image-5.8.0-59-lowlatency 5.8.0-59.66~20.04.1 linux-image-aws 5.8.0.1038.40~20.04.11 linux-image-azure 5.8.0.1036.38~20.04.8 linux-image-gcp 5.8.0.1035.37~20.04.9 linux-image-generic-64k-hwe-20.04 5.8.0.59.66~20.04.42 linux-image-generic-hwe-20.04 5.8.0.59.66~20.04.42 linux-image-generic-lpae-hwe-20.04 5.8.0.59.66~20.04.42 linux-image-lowlatency-hwe-20.04 5.8.0.59.66~20.04.42 linux-image-oracle 5.8.0.1033.34~20.04.9 linux-image-virtual-hwe-20.04 5.8.0.59.66~20.04.42
After a standard system update you need to reboot your computer to make all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well.
References: ubuntu.com/security/notices/USN-4999-1 CVE-2020-24586, CVE-2020-24587, CVE-2020-24588, CVE-2020-25670, CVE-2020-25671, CVE-2020-25672, CVE-2020-25673, CVE-2020-26139, CVE-2020-26141, CVE-2020-26145, CVE-2020-26147, CVE-2021-23133, CVE-2021-29155, CVE-2021-31440, CVE-2021-31829, CVE-2021-33200, CVE-2021-3609
Package Information: launchpad.net/ubuntu/+source/linux/5.8.0-59.66 launchpad.net/ubuntu/+source/linux-aws/5.8.0-1038.40 launchpad.net/ubuntu/+source/linux-azure/5.8.0-1036.38 launchpad.net/ubuntu/+source/linux-gcp/5.8.0-1035.37 launchpad.net/ubuntu/+source/linux-kvm/5.8.0-1030.32 launchpad.net/ubuntu/+source/linux-oracle/5.8.0-1033.34 launchpad.net/ubuntu/+source/linux-raspi/5.8.0-1029.32 launchpad.net/ubuntu/+source/linux-aws-5.8/5.8.0-1038.40~20.04.1 launchpad.net/ubuntu/+source/linux-azure-5.8/5.8.0-1036.38~20.04.1 launchpad.net/ubuntu/+source/linux-gcp-5.8/5.8.0-1035.37~20.04.1 launchpad.net/ubuntu/+source/linux-hwe-5.8/5.8.0-59.66~20.04.1 launchpad.net/ubuntu/+source/linux-oracle-5.8/5.8.0-1033.34~20.04.1