CVE - CVE-2021-47276

CVE-ID
CVE-2021-47276	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 URL:https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 MISC:https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 URL:https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 MISC:https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b URL:https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b MISC:https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 URL:https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 MISC:https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 URL:https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 MISC:https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb URL:https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb MISC:https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 URL:https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 MISC:https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 URL:https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7
Assigning CNA
kernel.org
Date Record Created
20240521	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240521)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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