发布于3月6日3月6日 Members Ubuntu: (CVE-2021-47276): linux vulnerability Severity 4 CVSS (AV:L/AC:M/Au:N/C:P/I:P/A:P) Published 05/21/2024 Created 11/21/2024 Added 11/19/2024 Modified 02/11/2025 Description In the Linux kernel, the following vulnerability has been resolved: ftrace: Do not blindly read the ip address in ftrace_bug() It was reported that a bug on arm64 caused a bad ip address to be used for updating into a nop in ftrace_init(), but the error path (rightfully) returned -EINVAL and not -EFAULT, as the bug caused more than one error to occur. But because -EINVAL was returned, the ftrace_bug() tried to report what was at the location of the ip address, and read it directly. This caused the machine to panic, as the ip was not pointing to a valid memory address. Instead, read the ip address with copy_from_kernel_nofault() to safely access the memory, and if it faults, report that the address faulted, otherwise report what was in that location. Solution(s) ubuntu-upgrade-linux ubuntu-upgrade-linux-aws ubuntu-upgrade-linux-aws-5-4 ubuntu-upgrade-linux-aws-fips ubuntu-upgrade-linux-aws-hwe ubuntu-upgrade-linux-azure ubuntu-upgrade-linux-azure-4-15 ubuntu-upgrade-linux-azure-5-4 ubuntu-upgrade-linux-azure-fips ubuntu-upgrade-linux-bluefield ubuntu-upgrade-linux-fips ubuntu-upgrade-linux-gcp ubuntu-upgrade-linux-gcp-4-15 ubuntu-upgrade-linux-gcp-5-4 ubuntu-upgrade-linux-gcp-fips ubuntu-upgrade-linux-gkeop ubuntu-upgrade-linux-hwe ubuntu-upgrade-linux-hwe-5-4 ubuntu-upgrade-linux-kvm ubuntu-upgrade-linux-oracle ubuntu-upgrade-linux-oracle-5-4 ubuntu-upgrade-linux-raspi ubuntu-upgrade-linux-raspi-5-4 References https://attackerkb.com/topics/cve-2021-47276 CVE - 2021-47276 https://git.kernel.org/linus/6c14133d2d3f768e0a35128faac8aa6ed4815051 https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 https://www.cve.org/CVERecord?id=CVE-2021-47276 View more
