{"id":555,"date":"2021-10-01T12:39:21","date_gmt":"2021-10-01T12:39:21","guid":{"rendered":"https:\/\/www.ucartz.com\/blog\/?p=555"},"modified":"2026-10-19T03:43:41","modified_gmt":"2026-10-19T03:43:41","slug":"ubuntu-5092-2-linux-kernel-vulnerabilities","status":"publish","type":"post","link":"https:\/\/www.ucartz.com\/blog\/ubuntu-5092-2-linux-kernel-vulnerabilities\/","title":{"rendered":"Ubuntu 5092-2: Linux kernel vulnerabilities"},"content":{"rendered":"\r\n<p class=\"wp-block-paragraph\">Ubuntu Security Notice USN-5092-2<br>September 29, 2021 linux-hwe-5.11, linux-azure, linux-azure-5.11, linux-oracle-5.11 vulnerabilities<\/p>\r\n\r\n\r\n\r\n<p class=\"has-text-align-left wp-block-paragraph\"><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">A security issue affects these releases of Ubuntu and its derivatives: &#8211; Ubuntu 21.04<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\"><li>Ubuntu 20.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description:<\/li><li>linux-azure: Linux kernel for Microsoft Azure Cloud systems<\/li><li>linux-signed-azure: Signed kernel image azure<\/li><li>linux-azure-5.11: Linux kernel for Microsoft Azure cloud systems<\/li><li>linux-hwe-5.11: Linux hardware enablement (HWE) kernel<\/li><li>linux-oracle-5.11: Linux kernel for Oracle Cloud systems Details: Valentina Palmiotti discovered that the io_uring subsystem in the Linux<br>kernel could be coerced to free adjacent memory. A local attacker could use<br>this to execute arbitrary code. (CVE-2021-41073) Ofek Kirzner, Adam Morrison, Benedict Schlueter, and Piotr Krysiuk<br>discovered that the BPF verifier in the Linux kernel missed possible<br>mispredicted branches due to type confusion, allowing a side-channel<br>attack. An attacker could use this to expose sensitive information.<br>(CVE-2021-33624) Benedict Schlueter discovered that the BPF subsystem in the Linux kernel<br>did not properly protect against Speculatively Store Bypass (SSB) side-<br>channel attacks in some situations. A local attacker could possibly use<br>this to expose sensitive information. (CVE-2021-34556) Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not<br>properly protect against Speculatively Store Bypass (SSB) side-channel<br>attacks in some situations. A local attacker could possibly use this to<br>expose sensitive information. (CVE-2021-35477) It was discovered that the tracing subsystem in the Linux kernel did not<br>properly keep track of per-cpu ring buffer state. A privileged attacker<br>could use this to cause a denial of service. (CVE-2021-3679) It was discovered that the Option USB High Speed Mobile device driver in<br>the Linux kernel did not properly handle error conditions. A physically<br>proximate attacker could use this to cause a denial of service (system<br>crash) or possibly execute arbitrary code. (CVE-2021-37159) Alexey Kardashevskiy discovered that the KVM implementation for PowerPC<br>systems in the Linux kernel did not properly validate RTAS arguments in<br>some situations. An attacker in a guest vm could use this to cause a denial<br>of service (host OS crash) or possibly execute arbitrary code.<br>(CVE-2021-37576) It was discovered that the Virtio console implementation in the Linux<br>kernel did not properly validate input lengths in some situations. A local<br>attacker could possibly use this to cause a denial of service (system<br>crash). (CVE-2021-38160) Michael Wakabayashi discovered that the NFSv4 client implementation in the<br>Linux kernel did not properly order connection setup operations. An<br>attacker controlling a remote NFS server could use this to cause a denial<br>of service on the client. (CVE-2021-38199) It was discovered that the Sun RPC implementation in the Linux kernel<br>contained an out-of-bounds access error. A remote attacker could possibly<br>use this to cause a denial of service (system crash). (CVE-2021-38201) It was discovered that the MAX-3421 host USB device driver in the Linux<br>kernel did not properly handle device removal events. A physically<br>proximate attacker could use this to cause a denial of service (system<br>crash). (CVE-2021-38204) It was discovered that the Xilinx 10\/100 Ethernet Lite device driver in the<br>Linux kernel could report pointer addresses in some situations. An attacker<br>could use this information to ease the exploitation of another<br>vulnerability. (CVE-2021-38205) Update instructions: The problem can be corrected by updating your system to the following<br>package versions: Ubuntu 21.04: linux-image-5.11.0-1017-azure 5.11.0-1017.18 linux-image-azure 5.11.0.1017.18 Ubuntu 20.04 LTS: linux-image-5.11.0-1017-azure 5.11.0-1017.18~20.04.1 linux-image-5.11.0-1019-oracle 5.11.0-1019.20~20.04.1 linux-image-5.11.0-37-generic 5.11.0-37.41~20.04.2 linux-image-5.11.0-37-generic-64k 5.11.0-37.41~20.04.2 linux-image-5.11.0-37-generic-lpae 5.11.0-37.41~20.04.2 linux-image-5.11.0-37-lowlatency 5.11.0-37.41~20.04.2 linux-image-azure-edge 5.11.0.1017.18~20.04.16 linux-image-generic-64k-hwe-20.04 5.11.0.37.41~20.04.16 linux-image-generic-hwe-20.04 5.11.0.37.41~20.04.16 linux-image-generic-lpae-hwe-20.04 5.11.0.37.41~20.04.16 linux-image-lowlatency-hwe-20.04 5.11.0.37.41~20.04.16 linux-image-oracle 5.11.0.1019.20~20.04.12 linux-image-virtual-hwe-20.04 5.11.0.37.41~20.04.16 After a standard system update you need to reboot your computer to make<br>all the necessary changes. ATTENTION: Due to an unavoidable ABI change the kernel updates have<br>been given a new version number, which requires you to recompile and<br>reinstall all third party kernel modules you might have installed.<br>Unless you manually uninstalled the standard kernel metapackages<br>(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,<br>linux-powerpc), a standard system upgrade will automatically perform<br>this as well. References: https:\/\/ubuntu.com\/security\/notices\/USN-5092-2 https:\/\/ubuntu.com\/security\/notices\/USN-5092-1 CVE-2021-33624, CVE-2021-34556, CVE-2021-35477, CVE-2021-3679, CVE-2021-37159, CVE-2021-37576, CVE-2021-38160, CVE-2021-38199, CVE-2021-38201, CVE-2021-38204, CVE-2021-38205, CVE-2021-41073 Package Information: https:\/\/launchpad.net\/ubuntu\/+source\/linux-azure\/5.11.0-1017.18 https:\/\/launchpad.net\/ubuntu\/+source\/linux-signed-azure\/5.11.0-1017.18 https:\/\/launchpad.net\/ubuntu\/+source\/linux-azure-5.11\/5.11.0-1017.18~20.04.1 https:\/\/launchpad.net\/ubuntu\/+source\/linux-hwe-5.11\/5.11.0-37.41~20.04.2 https:\/\/launchpad.net\/ubuntu\/+source\/linux-oracle-5.11\/5.11.0-1019.20~20.04.1<\/li><\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Reference: <\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/ubuntu.com\/security\/notices\/USN-5095-1\" rel=\"nofollow noopener noreferrer\">https:\/\/ubuntu.com\/security\/notices\/USN-5095-1<\/a><\/p>\r\n","protected":false},"excerpt":{"rendered":"<p>Ubuntu Security Notice USN-5092-2September 29, 2021 linux-hwe-5.11, linux-azure, linux-azure-5.11, linux-oracle-5.11 vulnerabilities A security issue&#8230;<\/p>\n","protected":false},"author":16,"featured_media":579,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[397],"tags":[394,36],"class_list":["post-555","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-security","tag-linux","tag-vulnerability"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ubuntu 5092-2: Linux kernel vulnerabilities | Ucartz<\/title>\n<meta name=\"description\" content=\"Ubuntu Security Notice USN-5092-2September 29, 2021 linux-hwe-5.11, linux-azure, linux-azure-5.11, 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